Option universe resolution improvements (#8324)

* Option universe improvements

- Improvement for resolution handling of option universes, affecting
  performance in live mode. Adding regression algorithm

* Minor fix for research test

Algorithm.CSharp/AddAndRemoveOptionContractRegressionAlgorithm.cs

@@ -40,8 +40,8 @@ namespace QuantConnect.Algorithm.CSharp
 
             var aapl = QuantConnect.Symbol.Create("AAPL", SecurityType.Equity, Market.USA);
 
-            _contract = OptionChainProvider.GetOptionContractList(aapl, Time)
-                .OrderBy(symbol => symbol.ID.Symbol)
+            _contract = OptionChain(aapl)
+                .OrderBy(x => x.ID.Symbol)
                 .FirstOrDefault(optionContract => optionContract.ID.OptionRight == OptionRight.Call
                     && optionContract.ID.OptionStyle == OptionStyle.American);
             AddOptionContract(_contract);
@@ -90,7 +90,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/AddAndRemoveSecuritySameLoopRegressionAlgorithm.cs

@@ -39,8 +39,8 @@ namespace QuantConnect.Algorithm.CSharp
 
             var aapl = AddEquity("AAPL").Symbol;
 
-            _contract = OptionChainProvider.GetOptionContractList(aapl, Time)
-                .OrderBy(symbol => symbol.ID.Symbol)
+            _contract = OptionChain(aapl)
+                .OrderBy(x => x.ID.Symbol)
                 .FirstOrDefault(optionContract => optionContract.ID.OptionRight == OptionRight.Call
                     && optionContract.ID.OptionStyle == OptionStyle.American);
         }
@@ -87,7 +87,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/AddFutureOptionContractFromFutureChainRegressionAlgorithm.cs

@@ -49,7 +49,7 @@ namespace QuantConnect.Algorithm.CSharp
                 {
                     foreach (var contract in futuresContracts)
                     {
-                        var option_contract_symbols = OptionChainProvider.GetOptionContractList(contract.Symbol, Time).ToList();
+                        var option_contract_symbols = OptionChain(contract.Symbol).ToList();
                         if(option_contract_symbols.Count == 0)
                         {
                             continue;

Algorithm.CSharp/AddFutureOptionSingleOptionChainSelectedInUniverseFilterRegressionAlgorithm.cs

@@ -55,10 +55,10 @@ namespace QuantConnect.Algorithm.CSharp
             {
                 _optionFilterRan = true;
 
-                var expiry = new HashSet<DateTime>(optionContracts.Select(x => x.Underlying.ID.Date)).SingleOrDefault();
-                // Cast to IEnumerable<Symbol> because OptionFilterContract overrides some LINQ operators like `Select` and `Where`
+                var expiry = new HashSet<DateTime>(optionContracts.Select(x => x.Symbol.Underlying.ID.Date)).SingleOrDefault();
+                // Cast to List<Symbol> because OptionFilterContract overrides some LINQ operators like `Select` and `Where`
                 // and cause it to mutate the underlying Symbol collection when using those operators.
-                var symbol = new HashSet<Symbol>(((IEnumerable<Symbol>)optionContracts).Select(x => x.Underlying)).SingleOrDefault();
+                var symbol = new HashSet<Symbol>(((List<Symbol>)optionContracts).Select(x => x.Underlying)).SingleOrDefault();
 
                 if (expiry == null || symbol == null)
                 {

Algorithm.CSharp/AddOptionContractExpiresRegressionAlgorithm.cs

@@ -46,8 +46,8 @@ namespace QuantConnect.Algorithm.CSharp
         {
             if (_option == null)
             {
-                var option = OptionChainProvider.GetOptionContractList(_twx, Time)
-                    .OrderBy(symbol => symbol.ID.Symbol)
+                var option = OptionChain(_twx)
+                    .OrderBy(x => x.ID.Symbol)
                     .FirstOrDefault(optionContract => optionContract.ID.Date == _expiration
                                                       && optionContract.ID.OptionRight == OptionRight.Call
                                                       && optionContract.ID.OptionStyle == OptionStyle.American);
@@ -122,7 +122,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/AddOptionContractFromUniverseRegressionAlgorithm.cs

@@ -13,12 +13,12 @@
  * limitations under the License.
 */
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using QuantConnect.Data;
 using QuantConnect.Data.UniverseSelection;
 using QuantConnect.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace QuantConnect.Algorithm.CSharp
 {
@@ -110,14 +110,14 @@ namespace QuantConnect.Algorithm.CSharp
 
             foreach (var addedSecurity in changes.AddedSecurities)
             {
-                var option = OptionChainProvider.GetOptionContractList(addedSecurity.Symbol, Time)
-                    .OrderBy(symbol => symbol.ID.Symbol)
+                var option = OptionChain(addedSecurity.Symbol)
+                    .OrderBy(contractData => contractData.ID.Symbol)
                     .First(optionContract => optionContract.ID.Date == _expiration
                                                       && optionContract.ID.OptionRight == OptionRight.Call
                                                       && optionContract.ID.OptionStyle == OptionStyle.American);
                 AddOptionContract(option);
 
-                foreach (var symbol in new[] { option, option.Underlying })
+                foreach (var symbol in new[] { option.Symbol, option.Underlying.Symbol })
                 {
                     var config = SubscriptionManager.SubscriptionDataConfigService.GetSubscriptionDataConfigs(symbol).ToList();
 
@@ -174,7 +174,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 2;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/AddOptionContractTwiceRegressionAlgorithm.cs

@@ -43,8 +43,8 @@ namespace QuantConnect.Algorithm.CSharp
 
             var aapl = QuantConnect.Symbol.Create("AAPL", SecurityType.Equity, Market.USA);
 
-            _contract = OptionChainProvider.GetOptionContractList(aapl, Time)
-                .OrderBy(symbol => symbol.ID.StrikePrice)
+            _contract = OptionChain(aapl)
+                .OrderBy(x => x.ID.StrikePrice)
                 .FirstOrDefault(optionContract => optionContract.ID.OptionRight == OptionRight.Call
                     && optionContract.ID.OptionStyle == OptionStyle.American);
             AddOptionContract(_contract);
@@ -121,7 +121,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/AddOptionWithOnMarketOpenOnlyFilterRegressionAlgorithm.cs

@@ -13,7 +13,6 @@
  * limitations under the License.
 */
 
-using System;
 using System.Collections.Generic;
 using System.Linq;
 using QuantConnect.Data.UniverseSelection;
@@ -59,19 +58,9 @@ namespace QuantConnect.Algorithm.CSharp
             var changeOptions = changes.AddedSecurities.Concat(changes.RemovedSecurities)
                                                                         .Where(s => s.Type == SecurityType.Option);
 
-            // Susbtract one minute to get the actual market open. If market open is at 9:30am, this will be invoked at 9:31am
-            var expectedTime = Time.TimeOfDay - TimeSpan.FromMinutes(1);
-            var allOptionsWereChangedOnMarketOpen = changeOptions.All(s =>
+            if (Time != Time.Date)
             {
-                var firstMarketSegment = s.Exchange.Hours.MarketHours[Time.DayOfWeek].Segments
-                                                         .First(segment => segment.State == MarketHoursState.Market);
-
-                return firstMarketSegment.Start == expectedTime;
-            });
-
-            if (!allOptionsWereChangedOnMarketOpen)
-            {
-                throw new RegressionTestException("Expected options filter to be run only on market open");
+                throw new RegressionTestException($"Expected options filter to be run only at midnight. Actual was {Time}");
             }
         }
 
@@ -88,7 +77,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all time slices of algorithm
         /// </summary>
-        public long DataPoints => 5952220;
+        public long DataPoints => 470217;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/AddRemoveOptionUniverseRegressionAlgorithm.cs

@@ -35,14 +35,15 @@ namespace QuantConnect.Algorithm.CSharp
         private readonly HashSet<Symbol> _expectedData = new HashSet<Symbol>();
         private readonly HashSet<Symbol> _expectedUniverses = new HashSet<Symbol>();
         private bool _expectUniverseSubscription;
+        private DateTime _universeSubscriptionTime;
 
         // order of expected contract additions as price moves
         private int _expectedContractIndex;
         private readonly List<Symbol> _expectedContracts = new List<Symbol>
         {
-            SymbolRepresentation.ParseOptionTickerOSI("GOOG  151224P00747500"),
             SymbolRepresentation.ParseOptionTickerOSI("GOOG  151224P00750000"),
-            SymbolRepresentation.ParseOptionTickerOSI("GOOG  151224P00752500")
+            SymbolRepresentation.ParseOptionTickerOSI("GOOG  151224P00752500"),
+            SymbolRepresentation.ParseOptionTickerOSI("GOOG  151224P00755000")
         };
 
         public override void Initialize()
@@ -68,7 +69,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Log($"SubscriptionManager.Subscriptions:  {string.Join(" -- ", SubscriptionManager.Subscriptions)}");
                 throw new RegressionTestException($"Unexpected {OptionChainSymbol} subscription presence");
             }
-            if (!slice.ContainsKey(Underlying))
+            if (Time != _universeSubscriptionTime && !slice.ContainsKey(Underlying))
             {
                 // TODO : In fact, we're unable to properly detect whether or not we auto-added or it was manually added
                 // this is because when we auto-add the underlying we don't mark it as an internal security like we do with other auto adds
@@ -91,7 +92,7 @@ namespace QuantConnect.Algorithm.CSharp
                 var actual = string.Join(Environment.NewLine, UniverseManager.Keys.OrderBy(s => s.ToString()));
                 throw new RegressionTestException($"{Time}:: Detected differences in expected and actual universes{Environment.NewLine}Expected:{Environment.NewLine}{expected}{Environment.NewLine}Actual:{Environment.NewLine}{actual}");
             }
-            if (_expectedData.AreDifferent(slice.Keys.ToHashSet()))
+            if (Time != _universeSubscriptionTime && _expectedData.AreDifferent(slice.Keys.ToHashSet()))
             {
                 var expected = string.Join(Environment.NewLine, _expectedData.OrderBy(s => s.ToString()));
                 var actual = string.Join(Environment.NewLine, slice.Keys.OrderBy(s => s.ToString()));
@@ -99,7 +100,7 @@ namespace QuantConnect.Algorithm.CSharp
             }
 
             // 10AM add GOOG option chain
-            if (Time.TimeOfDay.Hours == 10 && Time.TimeOfDay.Minutes == 0)
+            if (Time.TimeOfDay.Hours == 10 && Time.TimeOfDay.Minutes == 0 && !_expectUniverseSubscription)
             {
                 if (Securities.ContainsKey(OptionChainSymbol))
                 {
@@ -110,9 +111,9 @@ namespace QuantConnect.Algorithm.CSharp
                 googOptionChain.SetFilter(u =>
                 {
                     // we added the universe at 10, the universe selection data should not be from before
-                    if (u.Underlying.EndTime.Hour < 10)
+                    if (u.LocalTime.Hour < 10)
                     {
-                        throw new RegressionTestException($"Unexpected underlying data point {u.Underlying.EndTime} {u.Underlying}");
+                        throw new RegressionTestException($"Unexpected selection time {u.LocalTime}");
                     }
                     // find first put above market price
                     return u.IncludeWeeklys()
@@ -124,6 +125,7 @@ namespace QuantConnect.Algorithm.CSharp
                 _expectedSecurities.Add(OptionChainSymbol);
                 _expectedUniverses.Add(OptionChainSymbol);
                 _expectUniverseSubscription = true;
+                _universeSubscriptionTime = Time;
             }
 
             // 11:30AM remove GOOG option chain
@@ -151,7 +153,7 @@ namespace QuantConnect.Algorithm.CSharp
                         var expectedContract = _expectedContracts[_expectedContractIndex];
                         if (added.Symbol != expectedContract)
                         {
-                            throw new RegressionTestException($"Expected option contract {expectedContract} to be added but received {added.Symbol}");
+                            throw new RegressionTestException($"Expected option contract {expectedContract.Value} to be added but received {added.Symbol}");
                         }
 
                         _expectedContractIndex++;
@@ -186,7 +188,7 @@ namespace QuantConnect.Algorithm.CSharp
 
             if (Securities.ContainsKey(Underlying))
             {
-                Console.WriteLine($"{Time:o}:: PRICE:: {Securities[Underlying].Price} CHANGES:: {changes}");
+                Log($"{Time:o}:: PRICE:: {Securities[Underlying].Price} CHANGES:: {changes}");
             }
         }
 
@@ -203,7 +205,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 200807;
+        public long DataPoints => 3502;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -227,7 +229,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Drawdown", "0%"},
             {"Expectancy", "0"},
             {"Start Equity", "100000"},
-            {"End Equity", "99079"},
+            {"End Equity", "98784"},
             {"Net Profit", "0%"},
             {"Sharpe Ratio", "0"},
             {"Sortino Ratio", "0"},
@@ -243,10 +245,10 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$6.00"},
-            {"Estimated Strategy Capacity", "$3000.00"},
-            {"Lowest Capacity Asset", "GOOCV 305RBR0BSWIX2|GOOCV VP83T1ZUHROL"},
-            {"Portfolio Turnover", "1.49%"},
-            {"OrderListHash", "bd115ec8bb7734b1561d6a6cc6c00039"}
+            {"Estimated Strategy Capacity", "$4000.00"},
+            {"Lowest Capacity Asset", "GOOCV 305RBQ2BZBZT2|GOOCV VP83T1ZUHROL"},
+            {"Portfolio Turnover", "2.58%"},
+            {"OrderListHash", "09f766c470a8bcf4bb6862da52bf25a7"}
         };
     }
 }

Algorithm.CSharp/AddTwoAndRemoveOneOptionContractRegressionAlgorithm.cs

@@ -41,8 +41,8 @@ namespace QuantConnect.Algorithm.CSharp
 
             var aapl = QuantConnect.Symbol.Create("AAPL", SecurityType.Equity, Market.USA);
 
-            var contracts = OptionChainProvider.GetOptionContractList(aapl, Time)
-                .OrderBy(symbol => symbol.ID.StrikePrice)
+            var contracts = OptionChain(aapl)
+                .OrderBy(x => x.ID.StrikePrice)
                 .Where(optionContract => optionContract.ID.OptionRight == OptionRight.Call
                     && optionContract.ID.OptionStyle == OptionStyle.American)
                 .Take(2)
@@ -106,7 +106,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/BacktestingBrokerageRegressionAlgorithm.cs

@@ -296,7 +296,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1267414;
+        public long DataPoints => 27071;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -316,7 +316,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Total Orders", "3"},
             {"Average Win", "0%"},
             {"Average Loss", "-0.40%"},
-            {"Compounding Annual Return", "-22.717%"},
+            {"Compounding Annual Return", "-21.378%"},
             {"Drawdown", "0.400%"},
             {"Expectancy", "-1"},
             {"Start Equity", "100000"},

Algorithm.CSharp/BasicTemplateEurexFuturesAlgorithm.cs

@@ -0,0 +1,239 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+using System;
+using System.Collections.Generic;
+using QuantConnect.Data;
+using QuantConnect.Data.UniverseSelection;
+using QuantConnect.Interfaces;
+using QuantConnect.Orders;
+using QuantConnect.Securities;
+using QuantConnect.Securities.Future;
+
+namespace QuantConnect.Algorithm.CSharp
+{
+    /// <summary>
+    /// This algorithm tests and demonstrates EUREX futures subscription and trading:
+    /// - It tests contracts rollover by adding a continuous future and asserting that mapping happens at some point.
+    /// - It tests basic trading by buying a contract and holding it until expiration.
+    /// - It tests delisting and asserts the holdings are liquidated after that.
+    /// </summary>
+    public class BasicTemplateEurexFuturesAlgorithm : QCAlgorithm, IRegressionAlgorithmDefinition
+    {
+        private Future _continuousContract;
+        private Symbol _mappedSymbol;
+        private Symbol _contractToTrade;
+        private int _mappingsCount;
+        private decimal _boughtQuantity;
+        private decimal _liquidatedQuantity;
+        private bool _delisted;
+
+        public override void Initialize()
+        {
+            SetStartDate(2024, 5, 30);
+            SetEndDate(2024, 6, 23);
+
+            SetAccountCurrency(Currencies.EUR);
+            SetCash(1000000);
+
+            _continuousContract = AddFuture(Futures.Indices.EuroStoxx50, Resolution.Minute,
+                dataNormalizationMode: DataNormalizationMode.BackwardsRatio,
+                dataMappingMode: DataMappingMode.FirstDayMonth,
+                contractDepthOffset: 0);
+            _continuousContract.SetFilter(TimeSpan.Zero, TimeSpan.FromDays(180));
+            _mappedSymbol = _continuousContract.Mapped;
+
+            var benchmark = AddIndex("SX5E", market: Market.EUREX);
+            SetBenchmark(benchmark.Symbol);
+
+            var seeder = new FuncSecuritySeeder(GetLastKnownPrices);
+            SetSecurityInitializer(security => seeder.SeedSecurity(security));
+        }
+
+        public override void OnData(Slice slice)
+        {
+            foreach (var changedEvent in slice.SymbolChangedEvents.Values)
+            {
+                if (++_mappingsCount > 1)
+                {
+                    throw new RegressionTestException($"{Time} - Unexpected number of symbol changed events (mappings): {_mappingsCount}. " +
+                        $"Expected only 1.");
+                }
+
+                Debug($"{Time} - SymbolChanged event: {changedEvent}");
+
+                if (changedEvent.OldSymbol != _mappedSymbol.ID.ToString())
+                {
+                    throw new RegressionTestException($"{Time} - Unexpected symbol changed event old symbol: {changedEvent}");
+                }
+
+                if (changedEvent.NewSymbol != _continuousContract.Mapped.ID.ToString())
+                {
+                    throw new RegressionTestException($"{Time} - Unexpected symbol changed event new symbol: {changedEvent}");
+                }
+
+                // Let's trade the previous mapped contract, so we can hold it until expiration for testing
+                // (will be sooner than the new mapped contract)
+                _contractToTrade = _mappedSymbol;
+                _mappedSymbol = _continuousContract.Mapped;
+            }
+
+            // Let's trade after the mapping is done
+            if (_contractToTrade != null && _boughtQuantity == 0 && Securities[_contractToTrade].Exchange.ExchangeOpen)
+            {
+                Buy(_contractToTrade, 1);
+            }
+
+            if (_contractToTrade != null && slice.Delistings.TryGetValue(_contractToTrade, out var delisting))
+            {
+                if (delisting.Type == DelistingType.Delisted)
+                {
+                    _delisted = true;
+
+                    if (Portfolio.Invested)
+                    {
+                        throw new RegressionTestException($"{Time} - Portfolio should not be invested after the traded contract is delisted.");
+                    }
+                }
+            }
+        }
+
+        public override void OnOrderEvent(OrderEvent orderEvent)
+        {
+            if (orderEvent.Symbol != _contractToTrade)
+            {
+                throw new RegressionTestException($"{Time} - Unexpected order event symbol: {orderEvent.Symbol}. Expected {_contractToTrade}");
+            }
+
+            if (orderEvent.Direction == OrderDirection.Buy)
+            {
+                if (orderEvent.Status == OrderStatus.Filled)
+                {
+                    if (_boughtQuantity != 0 && _liquidatedQuantity != 0)
+                    {
+                        throw new RegressionTestException($"{Time} - Unexpected buy order event status: {orderEvent.Status}");
+                    }
+                    _boughtQuantity = orderEvent.Quantity;
+                }
+            }
+            else if (orderEvent.Direction == OrderDirection.Sell)
+            {
+                if (orderEvent.Status == OrderStatus.Filled)
+                {
+                    if (_boughtQuantity <= 0 && _liquidatedQuantity != 0)
+                    {
+                        throw new RegressionTestException($"{Time} - Unexpected sell order event status: {orderEvent.Status}");
+                    }
+                    _liquidatedQuantity = orderEvent.Quantity;
+
+                    if (_liquidatedQuantity != -_boughtQuantity)
+                    {
+                        throw new RegressionTestException($"{Time} - Unexpected liquidated quantity: {_liquidatedQuantity}. Expected: {-_boughtQuantity}");
+                    }
+                }
+            }
+        }
+
+        public override void OnSecuritiesChanged(SecurityChanges changes)
+        {
+            foreach (var addedSecurity in changes.AddedSecurities)
+            {
+                if (addedSecurity.Symbol.SecurityType == SecurityType.Future && addedSecurity.Symbol.IsCanonical())
+                {
+                    _mappedSymbol = _continuousContract.Mapped;
+                }
+            }
+        }
+
+        public override void OnEndOfAlgorithm()
+        {
+            if (_mappingsCount == 0)
+            {
+                throw new RegressionTestException($"Unexpected number of symbol changed events (mappings): {_mappingsCount}. Expected 1.");
+            }
+
+            if (!_delisted)
+            {
+                throw new RegressionTestException("Contract was not delisted");
+            }
+
+            // Make sure we traded and that the position was liquidated on delisting
+            if (_boughtQuantity <= 0 || _liquidatedQuantity >= 0)
+            {
+                throw new RegressionTestException($"Unexpected sold quantity: {_boughtQuantity} and liquidated quantity: {_liquidatedQuantity}");
+            }
+        }
+
+        /// <summary>
+        /// This is used by the regression test system to indicate if the open source Lean repository has the required data to run this algorithm.
+        /// </summary>
+        public bool CanRunLocally { get; } = true;
+
+        /// <summary>
+        /// This is used by the regression test system to indicate which languages this algorithm is written in.
+        /// </summary>
+        public List<Language> Languages { get; } = new() { Language.CSharp, Language.Python };
+
+        /// <summary>
+        /// Data Points count of all timeslices of algorithm
+        /// </summary>
+        public long DataPoints => 133945;
+
+        /// <summary>
+        /// Data Points count of the algorithm history
+        /// </summary>
+        public int AlgorithmHistoryDataPoints => 26;
+
+        /// <summary>
+        /// Final status of the algorithm
+        /// </summary>
+        public AlgorithmStatus AlgorithmStatus => AlgorithmStatus.Completed;
+
+        /// <summary>
+        /// This is used by the regression test system to indicate what the expected statistics are from running the algorithm
+        /// </summary>
+        public Dictionary<string, string> ExpectedStatistics => new Dictionary<string, string>
+        {
+            {"Total Orders", "2"},
+            {"Average Win", "0%"},
+            {"Average Loss", "-0.11%"},
+            {"Compounding Annual Return", "-1.667%"},
+            {"Drawdown", "0.100%"},
+            {"Expectancy", "-1"},
+            {"Start Equity", "1000000"},
+            {"End Equity", "998849.48"},
+            {"Net Profit", "-0.115%"},
+            {"Sharpe Ratio", "-34.455"},
+            {"Sortino Ratio", "-57.336"},
+            {"Probabilistic Sharpe Ratio", "0.002%"},
+            {"Loss Rate", "100%"},
+            {"Win Rate", "0%"},
+            {"Profit-Loss Ratio", "0"},
+            {"Alpha", "0"},
+            {"Beta", "0"},
+            {"Annual Standard Deviation", "0.002"},
+            {"Annual Variance", "0"},
+            {"Information Ratio", "-6.176"},
+            {"Tracking Error", "0.002"},
+            {"Treynor Ratio", "0"},
+            {"Total Fees", "€1.02"},
+            {"Estimated Strategy Capacity", "€2300000000.00"},
+            {"Lowest Capacity Asset", "FESX YJHOAMPYKRS5"},
+            {"Portfolio Turnover", "0.40%"},
+            {"OrderListHash", "54040d29a467becaedcf59d79323321b"}
+        };
+    }
+}

Algorithm.CSharp/BasicTemplateIndexOptionsDailyAlgorithm.cs

@@ -67,7 +67,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 378;
+        public override long DataPoints => 356;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/BasicTemplateIndexOptionsHourlyAlgorithm.cs

@@ -38,7 +38,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 2163;
+        public override long DataPoints => 1269;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/BasicTemplateOptionEquityStrategyAlgorithm.cs

@@ -102,7 +102,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 471135;
+        public long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -142,7 +142,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$26.00"},
-            {"Estimated Strategy Capacity", "$70000.00"},
+            {"Estimated Strategy Capacity", "$69000.00"},
             {"Lowest Capacity Asset", "GOOCV W78ZERHAOVVQ|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "61.31%"},
             {"OrderListHash", "35d406df401e5b27244e20f5ec57346e"}

Algorithm.CSharp/BasicTemplateOptionStrategyAlgorithm.cs

@@ -112,7 +112,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 471124;
+        public long DataPoints => 15130;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -152,7 +152,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$543.40"},
-            {"Estimated Strategy Capacity", "$3000.00"},
+            {"Estimated Strategy Capacity", "$4000.00"},
             {"Lowest Capacity Asset", "GOOCV W78ZFMEBBB2E|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "338.60%"},
             {"OrderListHash", "301c15063f6e269023d144ca69a765da"}

Algorithm.CSharp/BasicTemplateOptionsAlgorithm.cs

@@ -109,7 +109,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 471124;
+        public long DataPoints => 15012;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/BasicTemplateOptionsDailyAlgorithm.cs

@@ -122,7 +122,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 339;
+        public long DataPoints => 308;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/BasicTemplateOptionsFilterUniverseAlgorithm.cs

@@ -14,7 +14,6 @@
  *
 */
 
-using System;
 using System.Collections.Generic;
 using System.Linq;
 using QuantConnect.Data;
@@ -100,7 +99,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1252633;
+        public long DataPoints => 12290;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -120,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Total Orders", "2"},
             {"Average Win", "0%"},
             {"Average Loss", "-0.40%"},
-            {"Compounding Annual Return", "-21.622%"},
+            {"Compounding Annual Return", "-20.338%"},
             {"Drawdown", "0.300%"},
             {"Expectancy", "-1"},
             {"Start Equity", "100000"},

Algorithm.CSharp/BasicTemplateOptionsFrameworkAlgorithm.cs

@@ -139,7 +139,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1847643;
+        public long DataPoints => 17486;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -157,32 +157,32 @@ namespace QuantConnect.Algorithm.CSharp
         public Dictionary<string, string> ExpectedStatistics => new Dictionary<string, string>
         {
             {"Total Orders", "5"},
-            {"Average Win", "0.14%"},
-            {"Average Loss", "-0.28%"},
-            {"Compounding Annual Return", "-47.543%"},
+            {"Average Win", "0.13%"},
+            {"Average Loss", "-0.30%"},
+            {"Compounding Annual Return", "-46.395%"},
             {"Drawdown", "1.600%"},
-            {"Expectancy", "0.502"},
+            {"Expectancy", "0.429"},
             {"Start Equity", "100000"},
-            {"End Equity", "99178.50"},
-            {"Net Profit", "-0.821%"},
-            {"Sharpe Ratio", "-4.136"},
+            {"End Equity", "99149.50"},
+            {"Net Profit", "-0.850%"},
+            {"Sharpe Ratio", "-4.298"},
             {"Sortino Ratio", "0"},
-            {"Probabilistic Sharpe Ratio", "17.155%"},
+            {"Probabilistic Sharpe Ratio", "15.319%"},
             {"Loss Rate", "0%"},
             {"Win Rate", "100%"},
-            {"Profit-Loss Ratio", "0.50"},
-            {"Alpha", "-0.855"},
-            {"Beta", "1.047"},
-            {"Annual Standard Deviation", "0.099"},
+            {"Profit-Loss Ratio", "0.43"},
+            {"Alpha", "-0.84"},
+            {"Beta", "0.986"},
+            {"Annual Standard Deviation", "0.098"},
             {"Annual Variance", "0.01"},
-            {"Information Ratio", "-9.141"},
+            {"Information Ratio", "-9.299"},
             {"Tracking Error", "0.091"},
-            {"Treynor Ratio", "-0.392"},
+            {"Treynor Ratio", "-0.428"},
             {"Total Fees", "$4.00"},
             {"Estimated Strategy Capacity", "$0"},
             {"Lowest Capacity Asset", "AAPL R735QTJ8XC9X"},
-            {"Portfolio Turnover", "13.49%"},
-            {"OrderListHash", "2722fee93126736e03d66d7ab880b537"}
+            {"Portfolio Turnover", "13.50%"},
+            {"OrderListHash", "cf14a7ce9c86e6844051820fd4c9394c"}
         };
     }
 }

Algorithm.CSharp/BasicTemplateOptionsHourlyAlgorithm.cs

@@ -109,7 +109,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 32351;
+        public long DataPoints => 9504;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -129,7 +129,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Total Orders", "5"},
             {"Average Win", "0%"},
             {"Average Loss", "-0.07%"},
-            {"Compounding Annual Return", "-12.496%"},
+            {"Compounding Annual Return", "-11.517%"},
             {"Drawdown", "0.200%"},
             {"Expectancy", "-1"},
             {"Start Equity", "100000"},

Algorithm.CSharp/BasicTemplateSPXWeeklyIndexOptionsAlgorithm.cs

@@ -43,14 +43,12 @@ namespace QuantConnect.Algorithm.CSharp
             SetEndDate(2021, 1, 10);
             SetCash(1000000);
 
-            var spx = AddIndex("SPX").Symbol;
-
             // regular option SPX contracts
-            var spxOptions = AddIndexOption(spx);
+            var spxOptions = AddIndexOption("SPX");
             spxOptions.SetFilter(u => u.Strikes(0, 1).Expiration(0, 30));
 
             // weekly option SPX contracts
-            var spxw = AddIndexOption(spx, "SPXW");
+            var spxw = AddIndexOption("SPX", "SPXW");
             spxw.SetFilter(u => u.Strikes(0, 1)
                  // single week ahead since there are many SPXW contracts and we want to preserve performance
                  .Expiration(0, 7)
@@ -105,7 +103,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public virtual long DataPoints => 57869;
+        public virtual long DataPoints => 21467;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -125,29 +123,29 @@ namespace QuantConnect.Algorithm.CSharp
             {"Total Orders", "5"},
             {"Average Win", "0%"},
             {"Average Loss", "-0.69%"},
-            {"Compounding Annual Return", "59.804%"},
+            {"Compounding Annual Return", "54.478%"},
             {"Drawdown", "0.400%"},
             {"Expectancy", "-0.5"},
             {"Start Equity", "1000000"},
             {"End Equity", "1006025"},
             {"Net Profit", "0.602%"},
-            {"Sharpe Ratio", "3.01"},
+            {"Sharpe Ratio", "2.62"},
             {"Sortino Ratio", "0"},
-            {"Probabilistic Sharpe Ratio", "62.865%"},
+            {"Probabilistic Sharpe Ratio", "63.221%"},
             {"Loss Rate", "50%"},
             {"Win Rate", "50%"},
             {"Profit-Loss Ratio", "0"},
-            {"Alpha", "0.249"},
-            {"Beta", "-0.033"},
+            {"Alpha", "0.067"},
+            {"Beta", "-0.013"},
             {"Annual Standard Deviation", "0.004"},
             {"Annual Variance", "0"},
-            {"Information Ratio", "-99.414"},
-            {"Tracking Error", "0.072"},
-            {"Treynor Ratio", "-0.382"},
+            {"Information Ratio", "-50.808"},
+            {"Tracking Error", "0.086"},
+            {"Treynor Ratio", "-0.725"},
             {"Total Fees", "$0.00"},
             {"Estimated Strategy Capacity", "$580000.00"},
             {"Lowest Capacity Asset", "SPXW 31K54PVWHUJHQ|SPX 31"},
-            {"Portfolio Turnover", "0.48%"},
+            {"Portfolio Turnover", "0.40%"},
             {"OrderListHash", "07a085baedb37bb7c8d460558ea77e88"}
         };
     }

Algorithm.CSharp/BasicTemplateSPXWeeklyIndexOptionsStrategyAlgorithm.cs

@@ -109,7 +109,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public virtual long DataPoints => 40968;
+        public virtual long DataPoints => 16680;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/CoarseFineOptionUniverseChainRegressionAlgorithm.cs

@@ -48,7 +48,12 @@ namespace QuantConnect.Algorithm.CSharp
             UniverseSettings.Resolution = Resolution.Minute;
 
             SetStartDate(2014, 06, 04);
-            SetEndDate(2014, 06, 06);
+            // TWX is selected the 4th and 5th and aapl after that.
+            // If the algo ends on the 6th, TWX subscriptions will not be removed before OnEndOfAlgorithm is called:
+            //   - 6th: AAPL is selected, TWX is removed but subscriptions are not removed because the securities are invested.
+            //      - TWX and its options are liquidated.
+            //   - 7th: Since options universe selection is daily now, TWX subscriptions are removed the next day (7th)
+            SetEndDate(2014, 06, 07);
 
             var selectionUniverse = AddUniverse(enumerable => new[] { Time.Date <= new DateTime(2014, 6, 5) ? _twx : _aapl },
                 enumerable => new[] { Time.Date <= new DateTime(2014, 6, 5) ? _twx : _aapl });
@@ -157,7 +162,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 998464;
+        public long DataPoints => 18993;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -197,8 +202,8 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0.048"},
             {"Treynor Ratio", "0.172"},
             {"Total Fees", "$16.10"},
-            {"Estimated Strategy Capacity", "$3100000.00"},
-            {"Lowest Capacity Asset", "AOL VRKS95ENLBYE|AOL R735QTJ8XC9X"},
+            {"Estimated Strategy Capacity", "$5000000.00"},
+            {"Lowest Capacity Asset", "AOL R735QTJ8XC9X"},
             {"Portfolio Turnover", "17.64%"},
             {"OrderListHash", "a8605c1f5a9c67f60f1ddc963ec45542"}
         };

Algorithm.CSharp/ComboLegLimitOrderAlgorithm.cs

@@ -70,7 +70,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/ComboLimitOrderAlgorithm.cs

@@ -136,7 +136,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/ComboMarketOrderAlgorithm.cs

@@ -52,7 +52,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -92,7 +92,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$26.00"},
-            {"Estimated Strategy Capacity", "$70000.00"},
+            {"Estimated Strategy Capacity", "$69000.00"},
             {"Lowest Capacity Asset", "GOOCV W78ZERHAOVVQ|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "30.35%"},
             {"OrderListHash", "615c795b0c450cb8e4c3cba803ebb180"}

Algorithm.CSharp/ComboOrderTicketDemoAlgorithm.cs

@@ -331,7 +331,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 471135;
+        public long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/CoveredAndProtectiveCallStrategiesAlgorithm.cs

@@ -97,7 +97,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/CoveredAndProtectivePutStrategiesAlgorithm.cs

@@ -97,7 +97,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/CoveredCallComboLimitOrderAlgorithm.cs

@@ -106,7 +106,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 463141;
+        public long DataPoints => 7029;
 
         /// </summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/DefaultOptionPriceModelRegressionAlgorithm.cs

@@ -64,7 +64,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 5280;
+        public long DataPoints => 2862;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/DelayedSettlementAfterManualSecurityRemovalAlgorithm.cs

@@ -37,9 +37,9 @@ namespace QuantConnect.Algorithm.CSharp
 
             var equity = AddEquity("GOOG");
 
-            _optionSymbol = OptionChainProvider.GetOptionContractList(equity.Symbol, Time)
-                .OrderBy(symbol => symbol.ID.StrikePrice)
-                .ThenByDescending(symbol => symbol.ID.Date)
+            _optionSymbol = OptionChain(equity.Symbol)
+                .OrderBy(x => x.ID.StrikePrice)
+                .ThenByDescending(x => x.ID.Date)
                 .First(optionContract => optionContract.ID.OptionRight == OptionRight.Call);
             var option = AddOptionContract(_optionSymbol);
 
@@ -110,7 +110,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/DelistedIndexOptionDivestedRegression.cs

@@ -51,10 +51,7 @@ namespace QuantConnect.Algorithm.CSharp
 
             if (_addOption)
             {
-                var contracts = OptionChainProvider.GetOptionContractList(_spx, Time);
-                contracts = contracts.Where(x =>
-                    x.ID.OptionRight == OptionRight.Put &&
-                    x.ID.Date.Date == new DateTime(2021, 1, 15));
+                var contracts = OptionChain(_spx).Where(x => x.ID.OptionRight == OptionRight.Put && x.ID.Date.Date == new DateTime(2021, 1, 15));
 
                 var option = AddIndexOptionContract(contracts.First(), Resolution.Minute);
                 _optionExpiry = option.Expiry;
@@ -128,7 +125,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/EuropeanOptionsCannotBeExercisedBeforeExpiryRegressionAlgorithm.cs

@@ -132,7 +132,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all time slices of algorithm
         /// </summary>
-        public long DataPoints => 1839;
+        public long DataPoints => 1461;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/FillForwardUntilExpiryRegressionAlgorithm.cs

@@ -52,7 +52,7 @@ namespace QuantConnect.Algorithm.CSharp
             var _twxOption = AddOption("TWX", Resolution.Minute);
             _exchange = _twxOption.Exchange;
             _twxOption.SetFilter((x) => x
-                .Contracts(c => c.Where(s => _contracts.Contains(s.Value))));
+                .Contracts(c => c.Where(s => _contracts.Contains(s.Symbol.Value))));
             SetBenchmark(t => 1);
         }
 
@@ -122,7 +122,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1291113;
+        public long DataPoints => 70553;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/FutureOptionBuySellCallIntradayRegressionAlgorithm.cs

@@ -58,10 +58,10 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            var esOptions = OptionChainProvider.GetOptionContractList(es20m20, Time)
-                .Concat(OptionChainProvider.GetOptionContractList(es20h20, Time))
-                .Where(x => x.ID.StrikePrice == 3200m && x.ID.OptionRight == OptionRight.Call)
-                .Select(x => AddFutureOptionContract(x, Resolution.Minute).Symbol)
+            var esOptions = OptionChain(es20m20)
+                .Concat(OptionChain(es20h20))
+                .Where(contractData => contractData.ID.StrikePrice == 3200m && contractData.ID.OptionRight == OptionRight.Call)
+                .Select(contractData => AddFutureOptionContract(contractData, Resolution.Minute).Symbol)
                 .ToList();
 
             var expectedContracts = new[]

Algorithm.CSharp/FutureOptionCallITMExpiryRegressionAlgorithm.cs

@@ -53,7 +53,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Call)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionCallITMGreeksExpiryRegressionAlgorithm.cs

@@ -55,7 +55,7 @@ namespace QuantConnect.Algorithm.CSharp
                 TimeSpan.FromMinutes(1));
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20.Symbol, new DateTime(2020, 1, 5))
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20.Symbol)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Call)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionCallOTMExpiryRegressionAlgorithm.cs

@@ -59,9 +59,9 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option call expiring OTM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
-                .Where(x => x.ID.StrikePrice >= 3300m && x.ID.OptionRight == OptionRight.Call)
-                .OrderBy(x => x.ID.StrikePrice)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
+                .Where(contractData => contractData.ID.StrikePrice >= 3300m && contractData.ID.OptionRight == OptionRight.Call)
+                .OrderBy(contractData => contractData.ID.StrikePrice)
                 .Take(1)
                 .Single(), Resolution.Minute).Symbol;
 

Algorithm.CSharp/FutureOptionDailyRegressionAlgorithm.cs

@@ -47,7 +47,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution).Symbol;
 
             // Attempt to fetch a specific future option contract
-            DcOption = OptionChainProvider.GetOptionContractList(dc, Time)
+            DcOption = OptionChain(dc)
                 .Where(x => x.ID.StrikePrice == 17m && x.ID.OptionRight == OptionRight.Call)
                 .Select(x => AddFutureOptionContract(x, Resolution).Symbol)
                 .FirstOrDefault();

Algorithm.CSharp/FutureOptionIndicatorsRegressionAlgorithm.cs

@@ -22,7 +22,7 @@ namespace QuantConnect.Algorithm.CSharp
 {
     public class FutureOptionIndicatorsRegressionAlgorithm : OptionIndicatorsRegressionAlgorithm
     {
-        protected override string ExpectedGreeks { get; set; } = "Implied Volatility: 0.14089,Delta: 0.6308,Gamma: 0.00207,Vega: 5.61431,Theta: -0.48816,Rho: 0.02962";
+        protected override string ExpectedGreeks { get; set; } = "Implied Volatility: 0.14008,Delta: 0.63466,Gamma: 0.00209,Vega: 5.61442,Theta: -0.48254,Rho: 0.03098";
 
         public override void Initialize()
         {
@@ -32,7 +32,7 @@ namespace QuantConnect.Algorithm.CSharp
             var underlying = AddFutureContract(QuantConnect.Symbol.CreateFuture(Futures.Indices.SP500EMini, Market.CME, new DateTime(2020, 3, 20)),
                 Resolution.Minute).Symbol;
 
-            var option = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(underlying, Time)
+            var option = AddFutureOptionContract(OptionChain(underlying)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Call)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionPutITMExpiryRegressionAlgorithm.cs

@@ -54,7 +54,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice >= 3300m && x.ID.OptionRight == OptionRight.Put)
                 .OrderBy(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionPutOTMExpiryRegressionAlgorithm.cs

@@ -58,7 +58,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice <= 3150m && x.ID.OptionRight == OptionRight.Put)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionShortCallITMExpiryRegressionAlgorithm.cs

@@ -54,7 +54,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice <= 3100m && x.ID.OptionRight == OptionRight.Call)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionShortCallOTMExpiryRegressionAlgorithm.cs

@@ -55,7 +55,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice >= 3400m && x.ID.OptionRight == OptionRight.Call)
                 .OrderBy(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionShortPutITMExpiryRegressionAlgorithm.cs

@@ -54,7 +54,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice <= 3400m && x.ID.OptionRight == OptionRight.Put)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/FutureOptionShortPutOTMExpiryRegressionAlgorithm.cs

@@ -55,7 +55,7 @@ namespace QuantConnect.Algorithm.CSharp
                 Resolution.Minute).Symbol;
 
             // Select a future option expiring ITM, and adds it to the algorithm.
-            _esOption = AddFutureOptionContract(OptionChainProvider.GetOptionContractList(_es19m20, Time)
+            _esOption = AddFutureOptionContract(OptionChain(_es19m20)
                 .Where(x => x.ID.StrikePrice <= 3000m && x.ID.OptionRight == OptionRight.Put)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)

Algorithm.CSharp/HistoryWithDifferentDataNormalizationModeRegressionAlgorithm.cs

@@ -93,7 +93,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1475;
+        public long DataPoints => 1483;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/IndexOptionBuySellCallIntradayRegressionAlgorithm.cs

@@ -46,7 +46,7 @@ namespace QuantConnect.Algorithm.CSharp
             var spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            var spxOptions = OptionChainProvider.GetOptionContractList(spx, Time)
+            var spxOptions = OptionChain(spx)
                 .Where(x => (x.ID.StrikePrice == 3700m || x.ID.StrikePrice == 3800m) && x.ID.OptionRight == OptionRight.Call && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .Select(x => AddIndexOptionContract(x, Resolution.Minute).Symbol)
                 .OrderBy(x => x.ID.StrikePrice)
@@ -123,7 +123,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionCallITMExpiryDailyRegressionAlgorithm.cs

@@ -40,6 +40,11 @@ namespace QuantConnect.Algorithm.CSharp
         /// </summary>
         public override long DataPoints => 194;
 
+        /// <summary>
+        /// Data Points count of the algorithm history
+        /// </summary>
+        public override int AlgorithmHistoryDataPoints => 1;
+
         /// <summary>
         /// This is used by the regression test system to indicate what the expected statistics are from running the algorithm
         /// </summary>

Algorithm.CSharp/IndexOptionCallITMExpiryRegressionAlgorithm.cs

@@ -51,7 +51,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution).Symbol;
 
             // Select an index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Call && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)
@@ -175,7 +175,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public virtual int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionCallITMGreeksExpiryRegressionAlgorithm.cs

@@ -45,7 +45,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = spx.Symbol;
 
             // Select an index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Call && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)
@@ -161,7 +161,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionCallOTMExpiryDailyRegressionAlgorithm.cs

@@ -40,6 +40,11 @@ namespace QuantConnect.Algorithm.CSharp
         /// </summary>
         public override long DataPoints => 184;
 
+        /// <summary>
+        /// Data Points count of the algorithm history
+        /// </summary>
+        public override int AlgorithmHistoryDataPoints => 1;
+
         /// <summary>
         /// This is used by the regression test system to indicate what the expected statistics are from running the algorithm
         /// </summary>

Algorithm.CSharp/IndexOptionCallOTMExpiryRegressionAlgorithm.cs

@@ -56,7 +56,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution).Symbol;
 
             // Select a index option call expiring OTM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice >= 4250m && x.ID.OptionRight == OptionRight.Call && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderBy(x => x.ID.StrikePrice)
                 .Take(1)
@@ -183,7 +183,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public virtual int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionPutITMExpiryRegressionAlgorithm.cs

@@ -48,7 +48,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice >= 4200m && x.ID.OptionRight == OptionRight.Put && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderBy(x => x.ID.StrikePrice)
                 .Take(1)
@@ -190,7 +190,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionPutOTMExpiryRegressionAlgorithm.cs

@@ -53,7 +53,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Put && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)
@@ -174,7 +174,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionScaledStrikeRegressionAlgorithm.cs

@@ -92,7 +92,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 160;
+        public long DataPoints => 106;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -111,31 +111,31 @@ namespace QuantConnect.Algorithm.CSharp
         {
             {"Total Orders", "4"},
             {"Average Win", "0%"},
-            {"Average Loss", "-20.28%"},
+            {"Average Loss", "-20.04%"},
             {"Compounding Annual Return", "79228162514264337593543950335%"},
             {"Drawdown", "2.100%"},
             {"Expectancy", "-0.5"},
             {"Start Equity", "100000"},
-            {"End Equity", "273533.3"},
-            {"Net Profit", "173.533%"},
-            {"Sharpe Ratio", "6.71649879978702E+27"},
+            {"End Equity", "274018.3"},
+            {"Net Profit", "174.018%"},
+            {"Sharpe Ratio", "6.74816637965336E+27"},
             {"Sortino Ratio", "0"},
             {"Probabilistic Sharpe Ratio", "95.428%"},
             {"Loss Rate", "50%"},
             {"Win Rate", "50%"},
             {"Profit-Loss Ratio", "0"},
             {"Alpha", "7.922816251426434E+28"},
-            {"Beta", "4.588"},
-            {"Annual Standard Deviation", "11.796"},
-            {"Annual Variance", "139.147"},
-            {"Information Ratio", "6.718097080548688E+27"},
-            {"Tracking Error", "11.793"},
-            {"Treynor Ratio", "1.726981543228595E+28"},
+            {"Beta", "4.566"},
+            {"Annual Standard Deviation", "11.741"},
+            {"Annual Variance", "137.844"},
+            {"Information Ratio", "6.749778840887739E+27"},
+            {"Tracking Error", "11.738"},
+            {"Treynor Ratio", "1.7351225556608623E+28"},
             {"Total Fees", "$0.00"},
-            {"Estimated Strategy Capacity", "$8000.00"},
+            {"Estimated Strategy Capacity", "$7000.00"},
             {"Lowest Capacity Asset", "NQX 31M220FF62ZSE|NDX 31"},
-            {"Portfolio Turnover", "6.51%"},
-            {"OrderListHash", "1d60b5da574b3e9bc78335b4af3aa772"}
+            {"Portfolio Turnover", "6.40%"},
+            {"OrderListHash", "ec6881b180c68e6c7a48f6596c73e83d"}
         };
     }
 }

Algorithm.CSharp/IndexOptionShortCallITMExpiryRegressionAlgorithm.cs

@@ -60,9 +60,9 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            _esOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
-                .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Call && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
-                .OrderByDescending(x => x.ID.StrikePrice)
+            _esOption = AddIndexOptionContract(OptionChain(_spx)
+                .Where(contractData => contractData.ID.StrikePrice <= 3200m && contractData.ID.OptionRight == OptionRight.Call && contractData.ID.Date.Year == 2021 && contractData.ID.Date.Month == 1)
+                .OrderByDescending(contractData => contractData.ID.StrikePrice)
                 .Take(1)
                 .Single(), Resolution.Minute).Symbol;
 
@@ -188,7 +188,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionShortCallOTMExpiryRegressionAlgorithm.cs

@@ -50,7 +50,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice >= 4250m && x.ID.OptionRight == OptionRight.Call && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderBy(x => x.ID.StrikePrice)
                 .Take(1)
@@ -168,7 +168,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionShortPutITMExpiryRegressionAlgorithm.cs

@@ -59,9 +59,9 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
-                .Where(x => x.ID.StrikePrice <= 4200m && x.ID.OptionRight == OptionRight.Put && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
-                .OrderByDescending(x => x.ID.StrikePrice)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
+                .Where(contractData => contractData.ID.StrikePrice <= 4200m && contractData.ID.OptionRight == OptionRight.Put && contractData.ID.Date.Year == 2021 && contractData.ID.Date.Month == 1)
+                .OrderByDescending(contractData => contractData.ID.StrikePrice)
                 .Take(1)
                 .Single(), Resolution.Minute).Symbol;
 
@@ -191,7 +191,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndexOptionShortPutOTMExpiryRegressionAlgorithm.cs

@@ -50,7 +50,7 @@ namespace QuantConnect.Algorithm.CSharp
             _spx = AddIndex("SPX", Resolution.Minute).Symbol;
 
             // Select a index option expiring ITM, and adds it to the algorithm.
-            _spxOption = AddIndexOptionContract(OptionChainProvider.GetOptionContractList(_spx, Time)
+            _spxOption = AddIndexOptionContract(OptionChain(_spx)
                 .Where(x => x.ID.StrikePrice <= 3200m && x.ID.OptionRight == OptionRight.Put && x.ID.Date.Year == 2021 && x.ID.Date.Month == 1)
                 .OrderByDescending(x => x.ID.StrikePrice)
                 .Take(1)
@@ -167,7 +167,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/IndicatorSelectorsWorkWithDifferentOptions.cs

@@ -186,7 +186,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 5983802;
+        public long DataPoints => 1575423;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/InsufficientBuyingPowerForAutomaticExerciseRegressionAlgorithm.cs

@@ -44,7 +44,7 @@ namespace QuantConnect.Algorithm.CSharp
 
             _stock = AddEquity("GOOG").Symbol;
 
-            var contracts = OptionChainProvider.GetOptionContractList(_stock, UtcTime).ToList();
+            var contracts = OptionChain(_stock).ToList();
             _option = contracts
                 .Where(c => c.ID.OptionRight == OptionRight.Put)
                 .OrderBy(c => c.ID.Date)
@@ -176,7 +176,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/InteractiveBrokersBrokerageDisablesIndexOptionsExerciseRegressionAlgorithm.cs

@@ -145,7 +145,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all time slices of algorithm
         /// </summary>
-        public long DataPoints => 1960;
+        public long DataPoints => 1108;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/IronCondorStrategyAlgorithm.cs

@@ -119,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LargeQuantityOptionStrategyAlgorithm.cs

@@ -111,7 +111,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 25;
+        public int AlgorithmHistoryDataPoints => 7;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/LiquidatingMultipleOptionStrategiesRegressionAlgorithm.cs

@@ -147,7 +147,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 522277;
+        public long DataPoints => 20263;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LongAndShortButterflyCallStrategiesAlgorithm.cs

@@ -119,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LongAndShortButterflyPutStrategiesAlgorithm.cs

@@ -119,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LongAndShortCallCalendarSpreadStrategiesAlgorithm.cs

@@ -102,7 +102,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LongAndShortPutCalendarSpreadStrategiesAlgorithm.cs

@@ -102,7 +102,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LongAndShortStraddleStrategiesAlgorithm.cs

@@ -99,7 +99,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/LongAndShortStrangleStrategiesAlgorithm.cs

@@ -109,7 +109,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/NakedCallStrategyAlgorithm.cs

@@ -88,7 +88,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/NakedPutStrategyAlgorithm.cs

@@ -88,7 +88,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 4490;
+        public override long DataPoints => 2298;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/NakedShortOptionStrategyOverMarginAlgorithm.cs

@@ -131,7 +131,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 471124;
+        public long DataPoints => 15012;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -171,7 +171,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$9.10"},
-            {"Estimated Strategy Capacity", "$1800000.00"},
+            {"Estimated Strategy Capacity", "$2600000.00"},
             {"Lowest Capacity Asset", "GOOCV 30AKMEIPOSS1Y|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "7.50%"},
             {"OrderListHash", "70487a4231ef2237ca24642be28652c4"}

Algorithm.CSharp/NonDynamicOptionsFilterRegressionAlgorithm.cs

@@ -15,7 +15,6 @@
 */
 
 using System.Collections.Generic;
-using System;
 using System.Linq;
 using QuantConnect.Interfaces;
 using QuantConnect.Data.UniverseSelection;
@@ -52,58 +51,45 @@ namespace QuantConnect.Algorithm.CSharp
 
         public override void OnSecuritiesChanged(SecurityChanges changes)
         {
-            if (++_securitiesChangedCount == 1)
-            {
-                // This is the underlying security addition
-                if (changes.AddedSecurities.Count != 1 || changes.RemovedSecurities.Count != 0)
-                {
-                    throw new RegressionTestException("Unexpected security changes count: " +
-                        "on the first OnSecuritiesChanged callback, we expect only the underlying to be added.");
-                }
-
-                if (changes.AddedSecurities[0].Symbol != _optionSymbol.Underlying)
-                {
-                    throw new RegressionTestException("Unexpected security added: " +
-                        "on the first OnSecuritiesChanged callback, we expect only the underlying to be added.");
-                }
-            }
-            else if (_securitiesChangedCount < 4)
+            if (++_securitiesChangedCount < 3)
             {
                 // This is the universe selection, which we expect to happen twice, on market open of each day
 
-                // Check the time
-                var option = Securities[_optionSymbol];
-                var exchangeHours = option.Exchange.Hours;
-                var marketOpen = exchangeHours.GetNextMarketOpen(Time.Date, false);
-                if (Time.AddMinutes(-1) != marketOpen)
+                if (_securitiesChangedCount == 1)
                 {
-                    throw new RegressionTestException($"Unexpected security changes time. Current time {Time}. Expected time: {marketOpen.AddMinutes(1)}");
+                    var underlying = changes.AddedSecurities.Where(security => security.Symbol == _optionSymbol.Underlying).SingleOrDefault();
+                    if (underlying == null)
+                    {
+                        throw new RegressionTestException("Unexpected security changes: on the first OnSecuritiesChanged callback, we expect the underlying to be added.");
+                    }
                 }
 
                 // Check the changes
-                if (changes.AddedSecurities.Count == 0)
+                if (changes.AddedSecurities.Count <= 1)
                 {
                     throw new RegressionTestException("Unexpected security changes count: " +
-                        "on second and third OnSecuritiesChanged callbacks we expect options to be added");
+                        "on first and second OnSecuritiesChanged callbacks we expect options to be added");
                 }
 
-                if (changes.AddedSecurities.Any(security => !security.Symbol.HasCanonical() || security.Symbol.Canonical != _optionSymbol))
+                if (changes.AddedSecurities.Where(security => security.Symbol != _optionSymbol.Underlying)
+                        .Any(security => !security.Symbol.HasCanonical() || security.Symbol.Canonical != _optionSymbol))
                 {
                     throw new RegressionTestException("Unexpected security added: " +
-                        $"on second and third OnSecuritiesChanged callbacks we expect only {UnderlyingTicker} options to be added");
+                        $"on first and second OnSecuritiesChanged callbacks we expect only {UnderlyingTicker} options to be added");
                 }
 
-                if (_securitiesChangedCount == 3)
+                if (_securitiesChangedCount == 2)
                 {
                     // The options added the previous day should be removed
                     if (changes.RemovedSecurities.Count != _previouslyAddedOptionsCount)
                     {
                         throw new RegressionTestException("Unexpected security changes count: " +
-                            "on the third OnSecuritiesChanged callback we expect the previous day selection to be removed.");
+                            "on the second OnSecuritiesChanged callback we expect the previous day selection to be removed.");
                     }
                 }
 
-                _previouslyAddedOptionsCount = changes.AddedSecurities.Count;
+                // Subtract 1 to account for the underlying
+                _previouslyAddedOptionsCount = changes.AddedSecurities.Count - 1;
             }
             else
             {
@@ -113,7 +99,7 @@ namespace QuantConnect.Algorithm.CSharp
 
         public override void OnEndOfAlgorithm()
         {
-            if (_securitiesChangedCount != 3)
+            if (_securitiesChangedCount != 2)
             {
                 throw new RegressionTestException($"Unexpected number of calls to OnSecuritiesChanged: {_securitiesChangedCount}. " +
                     "We expect only 3 OnSecuritiesChanged callbacks for this algorithm");
@@ -133,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1814313;
+        public long DataPoints => 55702;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/NullBuyingPowerOptionBullCallSpreadAlgorithm.cs

@@ -107,7 +107,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 471135;
+        public long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/NullMarginComboOrderRegressionAlgorithm.cs

@@ -71,7 +71,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$11.50"},
-            {"Estimated Strategy Capacity", "$8800000.00"},
+            {"Estimated Strategy Capacity", "$13000000.00"},
             {"Lowest Capacity Asset", "GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "7580.62%"},
             {"OrderListHash", "5d8c976a405e1e5d1b19af0d1cdbf05d"}

Algorithm.CSharp/NullMarginMultipleOrdersRegressionAlgorithm.cs

@@ -119,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public virtual long DataPoints => 471135;
+        public virtual long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -159,7 +159,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$11.50"},
-            {"Estimated Strategy Capacity", "$8800000.00"},
+            {"Estimated Strategy Capacity", "$13000000.00"},
             {"Lowest Capacity Asset", "GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "7580.62%"},
             {"OrderListHash", "ea13456d0c97785f9f2fc12842831990"}

Algorithm.CSharp/OptionAssignmentRegressionAlgorithm.cs

@@ -46,7 +46,7 @@ namespace QuantConnect.Algorithm.CSharp
             SetCash(100000);
             Stock = AddEquity("GOOG", Resolution.Minute);
 
-            var contracts = OptionChainProvider.GetOptionContractList(Stock.Symbol, UtcTime).ToList();
+            var contracts = OptionChain(Stock.Symbol).ToList();
 
             PutOptionSymbol = contracts
                 .Where(c => c.ID.OptionRight == OptionRight.Put)
@@ -97,7 +97,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/OptionAssignmentStatisticsRegressionAlgorithm.cs

@@ -48,7 +48,7 @@ namespace QuantConnect.Algorithm.CSharp
 
             _goog = AddEquity("GOOG", Resolution.Minute);
 
-            var contracts = OptionChainProvider.GetOptionContractList(_goog.Symbol, UtcTime).ToList();
+            var contracts = OptionChain(_goog.Symbol).ToList();
 
             _googCall600Symbol = contracts
                 .Where(c => c.ID.OptionRight == OptionRight.Call)
@@ -271,7 +271,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/OptionChainConsistencyRegressionAlgorithm.cs

@@ -118,7 +118,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 470437;
+        public long DataPoints => 14325;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionChainFullDataRegressionAlgorithm.cs

@@ -0,0 +1,127 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using QuantConnect.Data;
+using QuantConnect.Interfaces;
+using QuantConnect.Securities;
+
+namespace QuantConnect.Algorithm.CSharp
+{
+    /// <summary>
+    /// Regression algorithm illustrating the usage of the <see cref="QCAlgorithm.OptionChain(Symbol)"/> method
+    /// to get an option chain, which contains additional data besides the symbols, including prices, implied volatility and greeks.
+    /// It also shows how this data can be used to filter the contracts based on certain criteria.
+    /// </summary>
+    public class OptionChainFullDataRegressionAlgorithm : QCAlgorithm, IRegressionAlgorithmDefinition
+    {
+        private Symbol _optionContract;
+
+        public override void Initialize()
+        {
+            SetStartDate(2015, 12, 24);
+            SetEndDate(2015, 12, 24);
+            SetCash(100000);
+
+            var goog = AddEquity("GOOG").Symbol;
+
+            _optionContract = OptionChain(goog)
+                // Get contracts expiring within 10 days, with an implied volatility greater than 0.5 and a delta less than 0.5
+                .Where(contractData => contractData.ID.Date - Time <= TimeSpan.FromDays(10) &&
+                    contractData.ImpliedVolatility > 0.5m &&
+                    contractData.Greeks.Delta < 0.5m)
+                // Get the contract with the latest expiration date
+                .OrderByDescending(x => x.ID.Date)
+                .First();
+
+            AddOptionContract(_optionContract);
+        }
+
+        public override void OnData(Slice slice)
+        {
+            // Do some trading with the selected contract for sample purposes
+            if (!Portfolio.Invested)
+            {
+                MarketOrder(_optionContract, 1);
+            }
+            else
+            {
+                Liquidate();
+            }
+        }
+
+        /// <summary>
+        /// This is used by the regression test system to indicate if the open source Lean repository has the required data to run this algorithm.
+        /// </summary>
+        public bool CanRunLocally { get; } = true;
+
+        /// <summary>
+        /// This is used by the regression test system to indicate which languages this algorithm is written in.
+        /// </summary>
+        public virtual List<Language> Languages { get; } = new() { Language.CSharp, Language.Python };
+
+        /// <summary>
+        /// Data Points count of all timeslices of algorithm
+        /// </summary>
+        public long DataPoints => 1057;
+
+        /// <summary>
+        /// Data Points count of the algorithm history
+        /// </summary>
+        public int AlgorithmHistoryDataPoints => 1;
+
+        /// <summary>
+        /// Final status of the algorithm
+        /// </summary>
+        public AlgorithmStatus AlgorithmStatus => AlgorithmStatus.Completed;
+
+        /// <summary>
+        /// This is used by the regression test system to indicate what the expected statistics are from running the algorithm
+        /// </summary>
+        public Dictionary<string, string> ExpectedStatistics => new Dictionary<string, string>
+        {
+            {"Total Orders", "210"},
+            {"Average Win", "0%"},
+            {"Average Loss", "0%"},
+            {"Compounding Annual Return", "0%"},
+            {"Drawdown", "0%"},
+            {"Expectancy", "0"},
+            {"Start Equity", "100000"},
+            {"End Equity", "96041"},
+            {"Net Profit", "0%"},
+            {"Sharpe Ratio", "0"},
+            {"Sortino Ratio", "0"},
+            {"Probabilistic Sharpe Ratio", "0%"},
+            {"Loss Rate", "0%"},
+            {"Win Rate", "0%"},
+            {"Profit-Loss Ratio", "0"},
+            {"Alpha", "0"},
+            {"Beta", "0"},
+            {"Annual Standard Deviation", "0"},
+            {"Annual Variance", "0"},
+            {"Information Ratio", "0"},
+            {"Tracking Error", "0"},
+            {"Treynor Ratio", "0"},
+            {"Total Fees", "$209.00"},
+            {"Estimated Strategy Capacity", "$0"},
+            {"Lowest Capacity Asset", "GOOCV W6U7PD1F2WYU|GOOCV VP83T1ZUHROL"},
+            {"Portfolio Turnover", "85.46%"},
+            {"OrderListHash", "a7ab1a9e64fe9ba76ea33a40a78a4e3b"}
+        };
+    }
+}

Algorithm.CSharp/OptionChainProviderAlgorithm.cs

@@ -100,7 +100,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of the algorithm history
         /// </summary>
-        public int AlgorithmHistoryDataPoints => 0;
+        public int AlgorithmHistoryDataPoints => 1;
 
         /// <summary>
         /// Final status of the algorithm

Algorithm.CSharp/OptionChainSubscriptionRemovalRegressionAlgorithm.cs

@@ -96,7 +96,7 @@ namespace QuantConnect.Algorithm.CSharp
 
             protected override OptionFilterUniverse Filter(OptionFilterUniverse filter)
             {
-                return filter.BackMonth().Contracts(filter.Take(15));
+                return filter.BackMonth().Contracts(contracts => contracts.Take(15));
             }
         }
 
@@ -113,7 +113,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 112808126;
+        public long DataPoints => 2155693;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionChainUniverseImmediateSelectionRegressionAlgorithm.cs

@@ -33,8 +33,7 @@ namespace QuantConnect.Algorithm.CSharp
         private bool _firstOnDataCallDone;
         private int _securityChangesCallCount;
 
-        private DateTime _selectionTimeUtc;
-
+        private bool _firstSelectionDone;
         private int _selectedOptionsCount;
 
         public override void Initialize()
@@ -49,9 +48,14 @@ namespace QuantConnect.Algorithm.CSharp
 
             option.SetFilter(universe =>
             {
-                if (_selectionTimeUtc == DateTime.MinValue)
+                if (!_firstSelectionDone)
                 {
-                    _selectionTimeUtc = universe.LocalTime.ConvertToUtc(option.Exchange.TimeZone);
+                    _firstSelectionDone = true;
+
+                    if (universe.LocalTime.ConvertTo(option.Exchange.TimeZone, TimeZone) != StartDate)
+                    {
+                        throw new Exception("Option chain universe selection time was not the expected start date");
+                    }
 
                     if (_firstOnDataCallDone)
                     {
@@ -74,6 +78,11 @@ namespace QuantConnect.Algorithm.CSharp
 
         public override void OnData(Slice slice)
         {
+            if (!IsMarketOpen(_optionSymbol.Underlying))
+            {
+                return;
+            }
+
             if (!_firstOnDataCallDone)
             {
                 _firstOnDataCallDone = true;
@@ -92,51 +101,31 @@ namespace QuantConnect.Algorithm.CSharp
 
         public override void OnSecuritiesChanged(SecurityChanges changes)
         {
-            Log($"{Time} :: {changes}");
+            Debug($"{Time} :: {changes}");
             _securityChangesCallCount++;
 
-            if (_securityChangesCallCount <= 2 && _firstOnDataCallDone)
-            {
-                throw new RegressionTestException("Expected 2 OnSecuritiesChanged calls (Underlying addition + Options additions) " +
-                    "before the first data is sent to the algorithm");
-            }
-
             if (_securityChangesCallCount == 1)
             {
                 // The first time, only the underlying should have been added
-                if (changes.AddedSecurities.Count != 1 || changes.RemovedSecurities.Count != 0)
+                if (changes.RemovedSecurities.Count != 0)
                 {
                     throw new RegressionTestException($"Unexpected securities changes on first OnSecuritiesChanged event. " +
-                        $"Expected one security added and none removed but got {changes.AddedSecurities.Count} securities added " +
-                        $"and {changes.RemovedSecurities.Count} removed.");
+                        $"Expected no removed securities but got {changes.RemovedSecurities.Count}.");
                 }
 
-                var addedSecuritySymbol = changes.AddedSecurities.Single().Symbol;
+                var addedSecuritySymbol = changes.AddedSecurities.SingleOrDefault(x => x.Symbol == _optionSymbol.Underlying).Symbol;
                 if (addedSecuritySymbol != _optionSymbol.Underlying)
                 {
-                    throw new RegressionTestException($"Expected to find {_optionSymbol.Underlying} in first OnSecuritiesChanged event, " +
-                        $"but found {addedSecuritySymbol}");
-                }
-            }
-            else if (_securityChangesCallCount == 2)
-            {
-                var expectedSelectionTime = StartDate.Add(Securities[_optionSymbol].Resolution.ToTimeSpan());
-
-                if (_selectionTimeUtc == DateTime.MinValue)
-                {
-                    throw new RegressionTestException("Option chain universe selection time was not set");
+                    throw new RegressionTestException($"Expected to find {_optionSymbol.Underlying} in first OnSecuritiesChanged event");
                 }
 
-                if (changes.AddedSecurities.Count != _selectedOptionsCount || changes.RemovedSecurities.Count != 0)
+                var addedOptions = changes.AddedSecurities
+                    .Where(x => x.Symbol.SecurityType == SecurityType.Option && x.Symbol.Canonical == _optionSymbol)
+                    .ToList();
+                if (addedOptions.Count != _selectedOptionsCount || addedOptions.Count != changes.AddedSecurities.Count - 1)
                 {
-                    throw new RegressionTestException($"Unexpected securities changes on second OnSecuritiesChanged event. " +
-                        $"Expected {_selectedOptionsCount} options added and none removed but got {changes.AddedSecurities.Count} " +
-                        $"securities added and {changes.RemovedSecurities.Count} removed.");
-                }
-
-                if (!changes.AddedSecurities.All(x => x.Type.IsOption() && !x.Symbol.IsCanonical() && x.Symbol.Canonical == _optionSymbol))
-                {
-                    throw new RegressionTestException($"Expected to find a multiple option contracts");
+                    throw new RegressionTestException($"Expected {_selectedOptionsCount} options to be added in the first OnSecuritiesChanged event, " +
+                        $"but found {addedOptions.Count}");
                 }
             }
         }
@@ -148,9 +137,9 @@ namespace QuantConnect.Algorithm.CSharp
                 throw new RegressionTestException("OnData was never called");
             }
 
-            if (_securityChangesCallCount < 2)
+            if (_securityChangesCallCount != 1)
             {
-                throw new RegressionTestException("OnSecuritiesChanged was not called at least twice");
+                throw new RegressionTestException($"Expected OnSecuritiesChanged to be called once, but was actually called {_securityChangesCallCount} times");
             }
         }
 
@@ -167,7 +156,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 470437;
+        public long DataPoints => 14325;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionChainUniverseRemovalRegressionAlgorithm.cs

@@ -33,6 +33,7 @@ namespace QuantConnect.Algorithm.CSharp
         private int _optionCount;
         private Symbol _lastEquityAdded;
         private Symbol _aapl;
+        private int _onSecuritiesChangedCallCount;
 
         public override void Initialize()
         {
@@ -62,7 +63,7 @@ namespace QuantConnect.Algorithm.CSharp
                 }
                 return universe.IncludeWeeklys()
                     .BackMonth() // back month so that they don't get removed because of being delisted
-                    .Contracts(universe.Take(5));
+                    .Contracts(contracts => contracts.Take(5));
             });
         }
 
@@ -100,9 +101,10 @@ namespace QuantConnect.Algorithm.CSharp
         public override void OnSecuritiesChanged(SecurityChanges changes)
         {
             Debug($"{GetStatusLog()}. CHANGES {changes}");
+            _onSecuritiesChangedCallCount++;
             if (Time.Day == 6)
             {
-                if (Time.Hour != 0 && Time.Hour != 9)
+                if (Time.Hour != 0)
                 {
                     throw new RegressionTestException($"Unexpected SecurityChanges time: {Time} {changes}");
                 }
@@ -112,7 +114,7 @@ namespace QuantConnect.Algorithm.CSharp
                     throw new RegressionTestException($"Unexpected removals: {changes}");
                 }
 
-                if (Time.Hour == 0)
+                if (_onSecuritiesChangedCallCount == 1)
                 {
                     // first we expect the equity to get Added
                     if (changes.AddedSecurities.Count != 1 || changes.AddedSecurities[0].Symbol != _aapl)
@@ -137,12 +139,9 @@ namespace QuantConnect.Algorithm.CSharp
                     throw new RegressionTestException($"Unexpected SecurityChanges time: {Time} {changes}");
                 }
 
-                if (changes.AddedSecurities.Count != 0)
-                {
-                    throw new RegressionTestException($"Unexpected additions: {changes}");
-                }
+                // Options can be selected/deselected on this day, but the equity should be removed
 
-                if (changes.RemovedSecurities.Count != 1 || changes.RemovedSecurities[0].Symbol != _aapl)
+                if (changes.RemovedSecurities.Count == 0 || !changes.RemovedSecurities.Any(x => x.Symbol == _aapl))
                 {
                     throw new RegressionTestException($"Unexpected SecurityChanges: {changes}");
                 }
@@ -205,7 +204,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 921994;
+        public long DataPoints => 17966;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionChainedAndUniverseSelectionRegressionAlgorithm.cs

@@ -95,7 +95,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 3541240;
+        public long DataPoints => 19701;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -115,7 +115,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Total Orders", "1"},
             {"Average Win", "0%"},
             {"Average Loss", "0%"},
-            {"Compounding Annual Return", "0.562%"},
+            {"Compounding Annual Return", "0.524%"},
             {"Drawdown", "0.000%"},
             {"Expectancy", "0"},
             {"Start Equity", "100000"},

Algorithm.CSharp/OptionChainedUniverseSelectionModelRegressionAlgorithm.cs

@@ -83,7 +83,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public long DataPoints => 1033404;
+        public long DataPoints => 49264;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionEquityBearCallLadderRegressionAlgorithm.cs

@@ -82,7 +82,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionEquityBearCallSpreadRegressionAlgorithm.cs

@@ -79,7 +79,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -119,7 +119,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$6.50"},
-            {"Estimated Strategy Capacity", "$5500000.00"},
+            {"Estimated Strategy Capacity", "$5400000.00"},
             {"Lowest Capacity Asset", "GOOCV WBGM95TAH2LI|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "28.44%"},
             {"OrderListHash", "e9104f749ad7055346b26e6db3bdb437"}

Algorithm.CSharp/OptionEquityBearCallSpreadSetHoldingsRegressionAlgorithm.cs

@@ -78,7 +78,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -118,7 +118,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$7.15"},
-            {"Estimated Strategy Capacity", "$33000000.00"},
+            {"Estimated Strategy Capacity", "$45000000.00"},
             {"Lowest Capacity Asset", "GOOCV WBGM95TAH2LI|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "6.17%"},
             {"OrderListHash", "8f1288896dafb2856b6045f8930e86a6"}

Algorithm.CSharp/OptionEquityBearPutLadderRegressionAlgorithm.cs

@@ -85,7 +85,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -120,7 +120,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$9.75"},
-            {"Estimated Strategy Capacity", "$1200000.00"},
+            {"Estimated Strategy Capacity", "$1100000.00"},
             {"Lowest Capacity Asset", "GOOCV 306CZL2DIL4G6|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "9.45%"},
             {"OrderListHash", "64e3480ee2ece70a3bb24bef3e7ecdd6"}

Algorithm.CSharp/OptionEquityBearPutSpreadRegressionAlgorithm.cs

@@ -76,7 +76,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionEquityBoxSpreadRegressionAlgorithm.cs

@@ -88,7 +88,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionEquityBullCallLadderRegressionAlgorithm.cs

@@ -85,7 +85,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history

Algorithm.CSharp/OptionEquityBullCallSpreadRegressionAlgorithm.cs

@@ -75,7 +75,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history
@@ -115,7 +115,7 @@ namespace QuantConnect.Algorithm.CSharp
             {"Tracking Error", "0"},
             {"Treynor Ratio", "0"},
             {"Total Fees", "$4.50"},
-            {"Estimated Strategy Capacity", "$5500000.00"},
+            {"Estimated Strategy Capacity", "$5400000.00"},
             {"Lowest Capacity Asset", "GOOCV WBGM95TAH2LI|GOOCV VP83T1ZUHROL"},
             {"Portfolio Turnover", "28.20%"},
             {"OrderListHash", "a67da2b19b248ab78686660793ddff73"}

Algorithm.CSharp/OptionEquityBullPutLadderRegressionAlgorithm.cs

@@ -82,7 +82,7 @@ namespace QuantConnect.Algorithm.CSharp
         /// <summary>
         /// Data Points count of all timeslices of algorithm
         /// </summary>
-        public override long DataPoints => 471135;
+        public override long DataPoints => 15023;
 
         /// <summary>
         /// Data Points count of the algorithm history