diff --git a/MtApi/ChartEventArgs.cs b/MtApi/ChartEventArgs.cs
index 79f534ea..0cdb8e6b 100644
--- a/MtApi/ChartEventArgs.cs
+++ b/MtApi/ChartEventArgs.cs
@@ -1,4 +1,5 @@
 using System;
+using MtApi.Events;
 
 namespace MtApi
 {
diff --git a/MtApi/MtChartEvent.cs b/MtApi/Events/MtChartEvent.cs
similarity index 90%
rename from MtApi/MtChartEvent.cs
rename to MtApi/Events/MtChartEvent.cs
index 838d2af9..9e765ace 100644
--- a/MtApi/MtChartEvent.cs
+++ b/MtApi/Events/MtChartEvent.cs
@@ -1,4 +1,4 @@
-namespace MtApi
+namespace MtApi.Events
 {
     internal class MtChartEvent
     {
diff --git a/MtApi/Events/MtEventTypes.cs b/MtApi/Events/MtEventTypes.cs
new file mode 100644
index 00000000..413d4cc3
--- /dev/null
+++ b/MtApi/Events/MtEventTypes.cs
@@ -0,0 +1,9 @@
+namespace MtApi.Events
+{
+    public enum MtEventTypes
+    {
+        LastTimeBar = 1,
+        ChartEvent  = 2,
+        OnLockTicks = 3
+    }
+}
diff --git a/MtApi/Events/OnLockTicksEvent.cs b/MtApi/Events/OnLockTicksEvent.cs
new file mode 100644
index 00000000..92f37f37
--- /dev/null
+++ b/MtApi/Events/OnLockTicksEvent.cs
@@ -0,0 +1,7 @@
+namespace MtApi.Events
+{
+    internal class OnLockTicksEvent
+    {
+        public string Instrument { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/MtApi/MtApi.csproj b/MtApi/MtApi.csproj
index 92bc2804..c601a6f5 100755
--- a/MtApi/MtApi.csproj
+++ b/MtApi/MtApi.csproj
@@ -74,6 +74,7 @@
     <Compile Include="EnumSymbolInfoInteger.cs" />
     <Compile Include="EnumTerminalInfoDouble.cs" />
     <Compile Include="EnumTerminalInfoInteger.cs" />
+    <Compile Include="Events\OnLockTicksEvent.cs" />
     <Compile Include="FlagFontStyle.cs" />
     <Compile Include="Monitors\AvailabilityOrdersEventArgs.cs" />
     <Compile Include="Monitors\OrderModification\ModifiedOrdersEventArgs.cs" />
@@ -86,14 +87,15 @@
     <Compile Include="Monitors\Triggers\TimeElapsedTrigger.cs" />
     <Compile Include="MqlRates.cs" />
     <Compile Include="MqlTick.cs" />
-    <Compile Include="MtChartEvent.cs" />
+    <Compile Include="Events\MtChartEvent.cs" />
     <Compile Include="MtConnectionEventArgs.cs" />
     <Compile Include="MtConnectionException.cs" />
     <Compile Include="MtConnectionState.cs" />
     <Compile Include="MtCommandType.cs" />
     <Compile Include="MtErrorCode.cs" />
-    <Compile Include="MtEventTypes.cs" />
+    <Compile Include="Events\MtEventTypes.cs" />
     <Compile Include="MtExecutionException.cs" />
+    <Compile Include="MtLockTicksEventArgs.cs" />
     <Compile Include="MtOrder.cs" />
     <Compile Include="MtQuote.cs" />
     <Compile Include="MtQuoteEventArgs.cs" />
diff --git a/MtApi/MtApiClient.cs b/MtApi/MtApiClient.cs
index c0630c66..627b264c 100755
--- a/MtApi/MtApiClient.cs
+++ b/MtApi/MtApiClient.cs
@@ -9,6 +9,7 @@ using MtApi.Requests;
 using MtApi.Responses;
 using Newtonsoft.Json;
 using System.Threading.Tasks;
+using MtApi.Events;
 
 namespace MtApi
 {
@@ -3140,6 +3141,9 @@ namespace MtApi
                 case MtEventTypes.ChartEvent:
                     FireOnChartEvent(e.ExpertHandle, JsonConvert.DeserializeObject<MtChartEvent>(e.Payload));
                     break;
+                case MtEventTypes.OnLockTicks:
+                    FireOnLockTicks(e.ExpertHandle, JsonConvert.DeserializeObject<OnLockTicksEvent>(e.Payload));
+                    break;
                 default:
                     throw new ArgumentOutOfRangeException();
             }
@@ -3155,6 +3159,11 @@ namespace MtApi
             OnChartEvent?.Invoke(this, new ChartEventArgs(expertHandler, chartEvent));
         }
 
+        private void FireOnLockTicks(int expertHandler, OnLockTicksEvent lockTicksEvent)
+        {
+            OnLockTicks?.Invoke(this, new MtLockTicksEventArgs(expertHandler, lockTicksEvent.Instrument));
+        }
+
         private void BacktestingReady()
         {
             SendCommand<object>(MtCommandType.BacktestingReady, null);
@@ -3171,6 +3180,7 @@ namespace MtApi
         public event EventHandler<MtConnectionEventArgs> ConnectionStateChanged;
         public event EventHandler<TimeBarArgs> OnLastTimeBar;
         public event EventHandler<ChartEventArgs> OnChartEvent;
+        public event EventHandler<MtLockTicksEventArgs> OnLockTicks;
 
         #endregion
     }
diff --git a/MtApi/MtEventTypes.cs b/MtApi/MtEventTypes.cs
deleted file mode 100644
index 735f20c4..00000000
--- a/MtApi/MtEventTypes.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-namespace MtApi
-{
-    public enum MtEventTypes
-    {
-        LastTimeBar = 1,
-        ChartEvent  = 2
-    }
-}
diff --git a/MtApi/MtLockTicksEventArgs.cs b/MtApi/MtLockTicksEventArgs.cs
new file mode 100644
index 00000000..9c5dfef5
--- /dev/null
+++ b/MtApi/MtLockTicksEventArgs.cs
@@ -0,0 +1,16 @@
+using System;
+
+namespace MtApi
+{
+    public class MtLockTicksEventArgs : EventArgs
+    {
+        internal MtLockTicksEventArgs(int expertHandle, string symbol)
+        {
+            ExpertHandle = expertHandle;
+            Symbol = symbol;
+        }
+
+        public int ExpertHandle { get; }
+        public string Symbol { get; }
+    }
+}
\ No newline at end of file
diff --git a/TestClients/TestApiClientUI/Form1.cs b/TestClients/TestApiClientUI/Form1.cs
index ccb12183..a2ef3000 100644
--- a/TestClients/TestApiClientUI/Form1.cs
+++ b/TestClients/TestApiClientUI/Form1.cs
@@ -44,6 +44,7 @@ namespace TestApiClientUI
             _apiClient.ConnectionStateChanged += apiClient_ConnectionStateChanged;
             _apiClient.OnLastTimeBar += _apiClient_OnLastTimeBar;
             _apiClient.OnChartEvent += _apiClient_OnChartEvent;
+            _apiClient.OnLockTicks += _apiClient_OnLockTicks;
 
             InitOrderCommandsGroup();
 
@@ -149,6 +150,14 @@ namespace TestApiClientUI
             PrintLog(msg);
         }
 
+        private void _apiClient_OnLockTicks(object sender, MtLockTicksEventArgs e)
+        {
+            var msg =
+                $"OnLockTicks: ExpertHandle = {e.ExpertHandle}, Symbol = {e.Symbol}";
+            Console.WriteLine(msg);
+            PrintLog(msg);
+        }
+
         private void apiClient_QuoteUpdated(object sender, string symbol, double bid, double ask)
         {
             Console.WriteLine(@"Quote: Symbol = {0}, Bid = {1}, Ask = {2}", symbol, bid, ask);
diff --git a/mq4/MtApi.ex4 b/mq4/MtApi.ex4
index 0d559c49..27c3e0bf 100755
Binary files a/mq4/MtApi.ex4 and b/mq4/MtApi.ex4 differ
diff --git a/mq4/MtApi.mq4 b/mq4/MtApi.mq4
index 30b52d26..8ffead98 100755
Binary files a/mq4/MtApi.mq4 and b/mq4/MtApi.mq4 differ