diff --git a/Data/market-hours/market-hours-database.json b/Data/market-hours/market-hours-database.json
index 9cdf3bdf59e3..7be0dd9d0f84 100644
--- a/Data/market-hours/market-hours-database.json
+++ b/Data/market-hours/market-hours-database.json
@@ -104054,35 +104054,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104096,35 +104096,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104138,35 +104138,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104264,35 +104264,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104348,35 +104348,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104390,35 +104390,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104432,35 +104432,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104474,35 +104474,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104516,35 +104516,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -104558,35 +104558,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -106446,35 +106446,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -106950,35 +106950,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -106992,35 +106992,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107076,35 +107076,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107118,35 +107118,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107286,35 +107286,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107328,35 +107328,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107370,35 +107370,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107412,35 +107412,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107454,35 +107454,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
@@ -107580,35 +107580,35 @@
       "monday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "tuesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "wednesday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "thursday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
       "friday": [
         {
           "start": "08:30:00",
-          "end": "15:00:00",
+          "end": "15:15:00",
           "state": "market"
         }
       ],
diff --git a/Tests/Common/Securities/MarketHoursDatabaseTests.cs b/Tests/Common/Securities/MarketHoursDatabaseTests.cs
index 3aa927ad9843..e878408163e1 100644
--- a/Tests/Common/Securities/MarketHoursDatabaseTests.cs
+++ b/Tests/Common/Securities/MarketHoursDatabaseTests.cs
@@ -538,6 +538,38 @@ public void CustomEntriesAreNotLostWhenReset(string ticker, SecurityType securit
             Assert.AreEqual(returnedEntry, entry);
         }
 
+        [TestCase("VIX9D")]
+        [TestCase("VIX6M")]
+        [TestCase("VIX1D")]
+        [TestCase("VIX1Y")]
+        [TestCase("VVIX")]
+        [TestCase("RVX")]
+        [TestCase("VXN")]
+        [TestCase("VXD")]
+        [TestCase("VWA")]
+        [TestCase("VWB")]
+        [TestCase("VXTH")]
+        [TestCase("COR1M")]
+        [TestCase("COR3M")]
+        [TestCase("COR6M")]
+        [TestCase("COR9M")]
+        [TestCase("COR1Y")]
+        [TestCase("COR30D")]
+        [TestCase("BXD")]
+        [TestCase("BXM")]
+        [TestCase("BXN")]
+        [TestCase("CLL")]
+        public void CorrectlyReadsCboeIndexMarketClose(string ticker)
+        {
+            var db = MarketHoursDatabase.FromDataFolder();
+            var exchangeHours = db.GetExchangeHours(Market.USA, Symbol.Create(ticker, SecurityType.Index, Market.USA), SecurityType.Index);
+
+            // Cboe's regular session for these indices ends at 16:15 ET, like VIX and SPX
+            var date = new DateTime(2026, 9, 17);
+            Assert.AreEqual(date.AddHours(8.5), exchangeHours.GetNextMarketOpen(date, false));
+            Assert.AreEqual(date.Add(new TimeSpan(15, 15, 0)), exchangeHours.GetNextMarketClose(date, false));
+        }
+
         [TestCase("VIX3M")]
         [TestCase("VVIX")]
         [TestCase("TESTIDX")]