diff --git a/packages/react-native/ReactCommon/react/renderer/uimanager/bindingtests/UIManagerBindingTest.cpp b/packages/react-native/ReactCommon/react/renderer/uimanager/bindingtests/UIManagerBindingTest.cpp
new file mode 100644
index 000000000000..ddab437f31b5
--- /dev/null
+++ b/packages/react-native/ReactCommon/react/renderer/uimanager/bindingtests/UIManagerBindingTest.cpp
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <memory>
+#include <span>
+#include <string>
+
+#include <gtest/gtest.h>
+#include <hermes/hermes.h>
+#include <jsi/jsi.h>
+#include <react/renderer/bridging/bridging.h>
+#include <react/renderer/core/ReactEventPriority.h>
+#include <react/renderer/core/ValueFactoryEventPayload.h>
+#include <react/renderer/element/Element.h>
+#include <react/renderer/element/testUtils.h>
+#include <react/renderer/uimanager/UIManager.h>
+#include <react/renderer/uimanager/UIManagerBinding.h>
+#include <react/renderer/uimanager/primitives.h>
+#include <react/timing/primitives.h>
+
+namespace facebook::react {
+
+class UIManagerBindingTest : public ::testing::Test {
+ public:
+  UIManagerBindingTest() {
+    runtime_ = facebook::hermes::makeHermesRuntime();
+    contextContainer_ = std::make_shared<ContextContainer>();
+
+    // The component-descriptor registry requires an EventDispatcher, but these
+    // tests never emit native->JS events through shadow-node EventEmitters,
+    // which is the only path that dereferences it. A null dispatcher is
+    // therefore safe here and matches the established UIManager test harnesses
+    // (FindShadowNodeByTagTest, FabricUIManagerTest, ShadowNodeFamilyTest).
+    ComponentDescriptorProviderRegistry componentDescriptorProviderRegistry{};
+    auto componentDescriptorRegistry =
+        componentDescriptorProviderRegistry.createComponentDescriptorRegistry(
+            ComponentDescriptorParameters{
+                .eventDispatcher = EventDispatcher::Shared{},
+                .contextContainer = contextContainer_,
+                .flavor = nullptr});
+
+    componentDescriptorProviderRegistry.add(
+        concreteComponentDescriptorProvider<RootComponentDescriptor>());
+    componentDescriptorProviderRegistry.add(
+        concreteComponentDescriptorProvider<ViewComponentDescriptor>());
+
+    builder_ = std::make_unique<ComponentBuilder>(componentDescriptorRegistry);
+
+    // No-op executor: these tests never rely on the UIManager scheduling work
+    // back onto a JS runtime thread, so the callback is intentionally dropped
+    // to keep the tests synchronous and hermetic (matching the sibling
+    // UIManager test fixtures).
+    RuntimeExecutor runtimeExecutor =
+        [](std::function<void(
+               facebook::jsi::Runtime & runtime)>&& /*callback*/) {};
+    uiManager_ =
+        std::make_shared<UIManager>(runtimeExecutor, contextContainer_);
+    uiManager_->setComponentDescriptorRegistry(componentDescriptorRegistry);
+
+    buildAndCommitTree();
+  }
+
+  void TearDown() override {
+    uiManager_->stopSurface(surfaceId_);
+  }
+
+ protected:
+  std::shared_ptr<RootShadowNode> buildTree() {
+    std::shared_ptr<RootShadowNode> rootNode;
+
+    // clang-format off
+    auto element =
+        Element<RootShadowNode>()
+          .tag(1)
+          .surfaceId(surfaceId_)
+          .reference(rootNode)
+          .props([] {
+            auto sharedProps = std::make_shared<RootProps>();
+            sharedProps->layoutConstraints = LayoutConstraints{
+                .minimumSize = {.width = 0, .height = 0},
+                .maximumSize = {.width = 500, .height = 500}};
+            return sharedProps;
+          })
+          .children({
+            Element<ViewShadowNode>()
+              .tag(viewTag_)
+              .surfaceId(surfaceId_)
+              .props([] {
+                return std::make_shared<ViewShadowNodeProps>();
+              })
+          });
+    // clang-format on
+
+    builder_->build(element);
+    return rootNode;
+  }
+
+  void buildAndCommitTree() {
+    auto rootNode = buildTree();
+
+    auto shadowTree = std::make_unique<ShadowTree>(
+        surfaceId_,
+        LayoutConstraints{},
+        LayoutContext{},
+        *uiManager_,
+        *contextContainer_);
+
+    shadowTree->commit(
+        [&rootNode](const RootShadowNode& /*oldRootShadowNode*/) {
+          return std::static_pointer_cast<RootShadowNode>(rootNode);
+        },
+        {true});
+
+    uiManager_->startSurface(
+        std::move(shadowTree),
+        "test",
+        folly::dynamic::object,
+        DisplayMode::Visible);
+  }
+
+  UIManagerBinding& installBinding() {
+    UIManagerBinding::createAndInstallIfNeeded(*runtime_, uiManager_);
+    return *UIManagerBinding::getBinding(*runtime_);
+  }
+
+  jsi::Function getMethod(UIManagerBinding& binding, const char* name) {
+    return binding.get(*runtime_, jsi::PropNameID::forAscii(*runtime_, name))
+        .asObject(*runtime_)
+        .asFunction(*runtime_);
+  }
+
+  std::shared_ptr<const ShadowNode> currentViewNode() const {
+    auto revision =
+        uiManager_->getShadowTreeRevisionProvider()->getCurrentRevision(
+            surfaceId_);
+    return revision->getChildren().front();
+  }
+
+  SurfaceId surfaceId_{0};
+  Tag viewTag_{42};
+  std::unique_ptr<facebook::hermes::HermesRuntime> runtime_;
+  std::shared_ptr<ContextContainer> contextContainer_;
+  std::unique_ptr<ComponentBuilder> builder_;
+  std::shared_ptr<UIManager> uiManager_;
+};
+
+// `createAndInstallIfNeeded` must publish the binding into the runtime's
+// global namespace such that `getBinding` recovers the very same
+// `UIManagerBinding` wrapping the `UIManager` we installed. Before install,
+// the lookup must return nullptr.
+TEST_F(UIManagerBindingTest, getBindingRecoversInstalledBinding) {
+  EXPECT_EQ(UIManagerBinding::getBinding(*runtime_), nullptr);
+
+  UIManagerBinding::createAndInstallIfNeeded(*runtime_, uiManager_);
+
+  auto binding = UIManagerBinding::getBinding(*runtime_);
+  ASSERT_NE(binding, nullptr);
+  EXPECT_EQ(&binding->getUIManager(), uiManager_.get());
+}
+
+// Host functions returned by `get` validate their argument count and must
+// raise a `jsi::JSError` when called with fewer arguments than required.
+// `appendChild` requires two arguments; calling it with one must throw.
+TEST_F(UIManagerBindingTest, hostFunctionThrowsWhenMissingArguments) {
+  auto& binding = installBinding();
+  auto appendChild = getMethod(binding, "appendChild");
+
+  auto onlyArgument = valueFromShadowNode(*runtime_, currentViewNode());
+  EXPECT_THROW(
+      appendChild.call(*runtime_, std::move(onlyArgument)), jsi::JSError);
+}
+
+// The `findShadowNodeByTag_DEPRECATED` host function must route through the
+// UIManager and marshal the result across JSI: an existing tag yields a
+// ShadowNode reference (recoverable via Bridging with the same tag), while a
+// missing tag yields JS `null`.
+TEST_F(UIManagerBindingTest, findShadowNodeByTagBridgesResult) {
+  auto& binding = installBinding();
+  auto findByTag = getMethod(binding, "findShadowNodeByTag_DEPRECATED");
+
+  auto found =
+      findByTag.call(*runtime_, jsi::Value{static_cast<double>(viewTag_)});
+  ASSERT_TRUE(found.isObject());
+  auto recovered =
+      Bridging<std::shared_ptr<const ShadowNode>>::fromJs(*runtime_, found);
+  ASSERT_NE(recovered, nullptr);
+  EXPECT_EQ(recovered->getTag(), viewTag_);
+
+  auto missing = findByTag.call(*runtime_, jsi::Value{9999.0});
+  EXPECT_TRUE(missing.isNull());
+}
+
+// A non-pointer event dispatched through `dispatchEvent` must reach the
+// registered JS handler with the event type, the factory-produced payload, and
+// a `timeStamp` property injected from the supplied event timestamp.
+TEST_F(UIManagerBindingTest, dispatchEventForwardsTypePayloadAndTimestamp) {
+  auto& binding = installBinding();
+
+  struct Captured {
+    bool called{false};
+    std::string type;
+    double foo{0};
+    double timeStamp{-1};
+  };
+  auto captured = std::make_shared<Captured>();
+
+  auto handler = jsi::Function::createFromHostFunction(
+      *runtime_,
+      jsi::PropNameID::forAscii(*runtime_, "handler"),
+      3,
+      [captured](
+          jsi::Runtime& rt,
+          const jsi::Value& /*thisValue*/,
+          const jsi::Value* args,
+          size_t count) -> jsi::Value {
+        auto arguments = std::span<const jsi::Value>(args, count);
+        captured->called = true;
+        captured->type = arguments[1].getString(rt).utf8(rt);
+        auto payload = arguments[2].getObject(rt);
+        captured->foo = payload.getProperty(rt, "foo").getNumber();
+        captured->timeStamp = payload.getProperty(rt, "timeStamp").getNumber();
+        return jsi::Value::undefined();
+      });
+
+  getMethod(binding, "registerEventHandler")
+      .call(*runtime_, std::move(handler));
+
+  ValueFactory factory = [](jsi::Runtime& rt) {
+    auto payload = jsi::Object(rt);
+    payload.setProperty(rt, "foo", 42);
+    return jsi::Value(rt, payload);
+  };
+  auto eventPayload = ValueFactoryEventPayload(std::move(factory));
+
+  auto timestamp = HighResTimeStamp::fromDOMHighResTimeStamp(1234.0);
+  binding.dispatchEvent(
+      *runtime_,
+      /*eventTarget=*/nullptr,
+      "topMyEvent",
+      ReactEventPriority::Discrete,
+      eventPayload,
+      timestamp);
+
+  ASSERT_TRUE(captured->called);
+  EXPECT_EQ(captured->type, "topMyEvent");
+  EXPECT_EQ(captured->foo, 42);
+  EXPECT_DOUBLE_EQ(captured->timeStamp, 1234.0);
+}
+
+} // namespace facebook::react