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diff --git a/src/vm/eventpipeeventinstance.h b/src/vm/eventpipeeventinstance.h
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#ifndef __EVENTPIPE_EVENTINSTANCE_H__
+#define __EVENTPIPE_EVENTINSTANCE_H__
+
+#ifdef FEATURE_PERFTRACING
+
+#include "eventpipe.h"
+#include "eventpipeevent.h"
+#include "fastserializableobject.h"
+#include "fastserializer.h"
+
+class EventPipeEventInstance
+{
+    // Declare friends.
+    friend EventPipeConfiguration;
+
+public:
+
+    EventPipeEventInstance(EventPipeEvent &event, DWORD threadID, BYTE *pData, unsigned int length, LPCGUID pActivityId, LPCGUID pRelatedActivityId);
+
+    // Get the event associated with this instance.
+    EventPipeEvent* GetEvent() const;
+
+    // Get the stack contents object to either read or write to it.
+    StackContents* GetStack();
+
+    // Get the timestamp.
+    LARGE_INTEGER GetTimeStamp() const;
+
+    // Get a pointer to the data payload.
+    BYTE* GetData() const;
+
+    // Get the length of the data.
+    unsigned int GetLength() const;
+
+    // Serialize this object using FastSerialization.
+    void FastSerialize(FastSerializer *pSerializer, StreamLabel metadataLabel);
+
+#ifdef _DEBUG
+    // Serialize this event to the JSON file.
+    void SerializeToJsonFile(EventPipeJsonFile *pFile);
+
+    bool EnsureConsistency();
+#endif // _DEBUG
+
+protected:
+
+#ifdef _DEBUG
+    unsigned int m_debugEventStart;
+#endif // _DEBUG
+
+    EventPipeEvent *m_pEvent;
+    DWORD m_threadID;
+    LARGE_INTEGER m_timeStamp;
+    GUID m_activityId;
+    GUID m_relatedActivityId;
+
+    BYTE *m_pData;
+    unsigned int m_dataLength;
+    StackContents m_stackContents;
+
+#ifdef _DEBUG
+    unsigned int m_debugEventEnd;
+#endif // _DEBUG
+
+private:
+
+    // This is used for metadata events by EventPipeConfiguration because
+    // the metadata event is created after the first instance of the event
+    // but must be inserted into the file before the first instance of the event.
+    void SetTimeStamp(LARGE_INTEGER timeStamp);
+};
+
+// A specific type of event instance for use by the SampleProfiler.
+// This is needed because the SampleProfiler knows how to walk stacks belonging
+// to threads other than the current thread.
+class SampleProfilerEventInstance : public EventPipeEventInstance
+{
+
+public:
+
+    SampleProfilerEventInstance(EventPipeEvent &event, Thread *pThread, BYTE *pData, unsigned int length);
+};
+
+#endif // FEATURE_PERFTRACING
+
+#endif // __EVENTPIPE_EVENTINSTANCE_H__