diff --git a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_factory.cc b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_factory.cc
index 1555f47efd8ed..428d24f2f3df8 100644
--- a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_factory.cc
+++ b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_factory.cc
@@ -166,6 +166,13 @@ struct NvTensorRtRtxEpFactory : OrtEpFactory {
     GetSupportedDevices = GetSupportedDevicesImpl;
     CreateEp = CreateEpImpl;
     ReleaseEp = ReleaseEpImpl;
+
+    CreateAllocator = CreateAllocatorImpl;
+    ReleaseAllocator = ReleaseAllocatorImpl;
+    CreateDataTransfer = CreateDataTransferImpl;
+
+    IsStreamAware = IsStreamAwareImpl;
+    CreateSyncStreamForDevice = CreateSyncStreamForDeviceImpl;
   }
 
   // Returns the name for the EP. Each unique factory configuration must have a unique name.
@@ -233,6 +240,43 @@ struct NvTensorRtRtxEpFactory : OrtEpFactory {
     // no-op as we never create an EP here.
   }
 
+  static OrtStatus* ORT_API_CALL CreateAllocatorImpl(OrtEpFactory* this_ptr,
+                                                     const OrtMemoryInfo* /*memory_info*/,
+                                                     const OrtKeyValuePairs* /*allocator_options*/,
+                                                     OrtAllocator** allocator) noexcept {
+    auto* factory = static_cast<NvTensorRtRtxEpFactory*>(this_ptr);
+
+    *allocator = nullptr;
+    return factory->ort_api.CreateStatus(
+        ORT_INVALID_ARGUMENT,
+        "CreateAllocator should not be called as we did not add OrtMemoryInfo to our OrtEpDevice.");
+  }
+
+  static void ORT_API_CALL ReleaseAllocatorImpl(OrtEpFactory* /*this_ptr*/, OrtAllocator* /*allocator*/) noexcept {
+    // should never be called as we don't implement CreateAllocator
+  }
+
+  static OrtStatus* ORT_API_CALL CreateDataTransferImpl(OrtEpFactory* /*this_ptr*/,
+                                                        OrtDataTransferImpl** data_transfer) noexcept {
+    *data_transfer = nullptr;  // not implemented
+    return nullptr;
+  }
+
+  static bool ORT_API_CALL IsStreamAwareImpl(const OrtEpFactory* /*this_ptr*/) noexcept {
+    return false;
+  }
+
+  static OrtStatus* ORT_API_CALL CreateSyncStreamForDeviceImpl(OrtEpFactory* this_ptr,
+                                                               const OrtMemoryDevice* /*memory_device*/,
+                                                               const OrtKeyValuePairs* /*stream_options*/,
+                                                               OrtSyncStreamImpl** stream) noexcept {
+    auto* factory = static_cast<NvTensorRtRtxEpFactory*>(this_ptr);
+
+    *stream = nullptr;
+    return factory->ort_api.CreateStatus(
+        ORT_INVALID_ARGUMENT, "CreateSyncStreamForDevice should not be called as IsStreamAware returned false.");
+  }
+
   const OrtApi& ort_api;
   const OrtLogger& default_logger;
   const std::string ep_name{kNvTensorRTRTXExecutionProvider};
diff --git a/onnxruntime/core/providers/openvino/ov_factory.cc b/onnxruntime/core/providers/openvino/ov_factory.cc
index 94e8cbfeca8d1..9f0871b14e92f 100644
--- a/onnxruntime/core/providers/openvino/ov_factory.cc
+++ b/onnxruntime/core/providers/openvino/ov_factory.cc
@@ -37,10 +37,17 @@ OpenVINOEpPluginFactory::OpenVINOEpPluginFactory(ApiPtrs apis, const std::string
   OrtEpFactory::GetName = GetNameImpl;
   OrtEpFactory::GetVendor = GetVendorImpl;
   OrtEpFactory::GetVendorId = GetVendorIdImpl;
-  OrtEpFactory::GetSupportedDevices = GetSupportedDevicesImpl;
   OrtEpFactory::GetVersion = GetVersionImpl;
+
+  OrtEpFactory::GetSupportedDevices = GetSupportedDevicesImpl;
+
+  OrtEpFactory::CreateAllocator = CreateAllocatorImpl;
+  OrtEpFactory::ReleaseAllocator = ReleaseAllocatorImpl;
   OrtEpFactory::CreateDataTransfer = CreateDataTransferImpl;
 
+  OrtEpFactory::IsStreamAware = IsStreamAwareImpl;
+  OrtEpFactory::CreateSyncStreamForDevice = CreateSyncStreamForDeviceImpl;
+
   ort_version_supported = ORT_API_VERSION;  // Set to the ORT version we were compiled with.
 }
 
diff --git a/onnxruntime/core/providers/openvino/ov_factory.h b/onnxruntime/core/providers/openvino/ov_factory.h
index 37739f67323c1..d860725a4c173 100644
--- a/onnxruntime/core/providers/openvino/ov_factory.h
+++ b/onnxruntime/core/providers/openvino/ov_factory.h
@@ -131,6 +131,10 @@ class OpenVINOEpPluginFactory : public OrtEpFactory, public ApiPtrs {
     return OpenVINOEpPluginFactory::vendor_id_;
   }
 
+  static const char* ORT_API_CALL GetVersionImpl(const OrtEpFactory*) noexcept {
+    return ORT_VERSION;
+  }
+
   static OrtStatus* ORT_API_CALL GetSupportedDevicesImpl(OrtEpFactory* this_ptr,
                                                          const OrtHardwareDevice* const* devices,
                                                          size_t num_devices,
@@ -141,14 +145,41 @@ class OpenVINOEpPluginFactory : public OrtEpFactory, public ApiPtrs {
     return ApiEntry([&]() { return factory->GetSupportedDevices(devices, num_devices, ep_devices, max_ep_devices, p_num_ep_devices); });
   }
 
+  static OrtStatus* ORT_API_CALL CreateAllocatorImpl(OrtEpFactory* this_ptr,
+                                                     const OrtMemoryInfo* /*memory_info*/,
+                                                     const OrtKeyValuePairs* /*allocator_options*/,
+                                                     OrtAllocator** allocator) noexcept {
+    auto* factory = static_cast<OpenVINOEpPluginFactory*>(this_ptr);
+
+    *allocator = nullptr;
+    return factory->ort_api.CreateStatus(
+        ORT_INVALID_ARGUMENT,
+        "CreateAllocator should not be called as we did not add OrtMemoryInfo to our OrtEpDevice.");
+  }
+
+  static void ORT_API_CALL ReleaseAllocatorImpl(OrtEpFactory* /*this_ptr*/, OrtAllocator* /*allocator*/) noexcept {
+    // should never be called as we don't implement CreateAllocator
+  }
+
   static OrtStatus* ORT_API_CALL CreateDataTransferImpl(OrtEpFactory* /*this_ptr*/,
                                                         OrtDataTransferImpl** data_transfer) noexcept {
     *data_transfer = nullptr;  // return nullptr to indicate that this EP does not support data transfer.
     return nullptr;
   }
 
-  static const char* ORT_API_CALL GetVersionImpl(const OrtEpFactory*) noexcept {
-    return ORT_VERSION;
+  static bool ORT_API_CALL IsStreamAwareImpl(const OrtEpFactory* /*this_ptr*/) noexcept {
+    return false;
+  }
+
+  static OrtStatus* ORT_API_CALL CreateSyncStreamForDeviceImpl(OrtEpFactory* this_ptr,
+                                                               const OrtMemoryDevice* /*memory_device*/,
+                                                               const OrtKeyValuePairs* /*stream_options*/,
+                                                               OrtSyncStreamImpl** stream) noexcept {
+    auto* factory = static_cast<OpenVINOEpPluginFactory*>(this_ptr);
+
+    *stream = nullptr;
+    return factory->ort_api.CreateStatus(
+        ORT_INVALID_ARGUMENT, "CreateSyncStreamForDevice should not be called as IsStreamAware returned false.");
   }
 };
 
diff --git a/onnxruntime/core/providers/vitisai/vitisai_provider_factory.cc b/onnxruntime/core/providers/vitisai/vitisai_provider_factory.cc
index cf4060e103c6d..50f924e468ed0 100644
--- a/onnxruntime/core/providers/vitisai/vitisai_provider_factory.cc
+++ b/onnxruntime/core/providers/vitisai/vitisai_provider_factory.cc
@@ -111,6 +111,13 @@ struct VitisAIEpFactory : OrtEpFactory {
     GetSupportedDevices = GetSupportedDevicesImpl;
     CreateEp = CreateEpImpl;
     ReleaseEp = ReleaseEpImpl;
+
+    CreateAllocator = CreateAllocatorImpl;
+    ReleaseAllocator = ReleaseAllocatorImpl;
+    CreateDataTransfer = CreateDataTransferImpl;
+
+    IsStreamAware = IsStreamAwareImpl;
+    CreateSyncStreamForDevice = CreateSyncStreamForDeviceImpl;
   }
 
   static const char* GetNameImpl(const OrtEpFactory* /*this_ptr*/) noexcept {
@@ -175,6 +182,43 @@ struct VitisAIEpFactory : OrtEpFactory {
     // no-op as we never create an EP here.
   }
 
+  static OrtStatus* ORT_API_CALL CreateAllocatorImpl(OrtEpFactory* this_ptr,
+                                                     const OrtMemoryInfo* /*memory_info*/,
+                                                     const OrtKeyValuePairs* /*allocator_options*/,
+                                                     OrtAllocator** allocator) noexcept {
+    auto* factory = static_cast<VitisAIEpFactory*>(this_ptr);
+
+    *allocator = nullptr;
+    return factory->ort_api.CreateStatus(
+        ORT_INVALID_ARGUMENT,
+        "CreateAllocator should not be called as we did not add OrtMemoryInfo to our OrtEpDevice.");
+  }
+
+  static void ORT_API_CALL ReleaseAllocatorImpl(OrtEpFactory* /*this_ptr*/, OrtAllocator* /*allocator*/) noexcept {
+    // should never be called as we don't implement CreateAllocator
+  }
+
+  static OrtStatus* ORT_API_CALL CreateDataTransferImpl(OrtEpFactory* /*this_ptr*/,
+                                                        OrtDataTransferImpl** data_transfer) noexcept {
+    *data_transfer = nullptr;  // not implemented
+    return nullptr;
+  }
+
+  static bool ORT_API_CALL IsStreamAwareImpl(const OrtEpFactory* /*this_ptr*/) noexcept {
+    return false;
+  }
+
+  static OrtStatus* ORT_API_CALL CreateSyncStreamForDeviceImpl(OrtEpFactory* this_ptr,
+                                                               const OrtMemoryDevice* /*memory_device*/,
+                                                               const OrtKeyValuePairs* /*stream_options*/,
+                                                               OrtSyncStreamImpl** stream) noexcept {
+    auto* factory = static_cast<VitisAIEpFactory*>(this_ptr);
+
+    *stream = nullptr;
+    return factory->ort_api.CreateStatus(
+        ORT_INVALID_ARGUMENT, "CreateSyncStreamForDevice should not be called as IsStreamAware returned false.");
+  }
+
   const OrtApi& ort_api;
   const OrtLogger& default_logger;
   static constexpr const char* const ep_name{kVitisAIExecutionProvider};