diff --git a/packages/react-native/ReactCommon/react/nativemodule/webperformance/NativePerformance.cpp b/packages/react-native/ReactCommon/react/nativemodule/webperformance/NativePerformance.cpp
index eb4e9f6b5de..a0d53eba212 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/webperformance/NativePerformance.cpp
+++ b/packages/react-native/ReactCommon/react/nativemodule/webperformance/NativePerformance.cpp
@@ -283,15 +283,6 @@ NativePerformance::getReactNativeStartupTiming(jsi::Runtime& /*rt*/) {
         startupLogger.getRunJSBundleStartTime();
   }
 
-  if (!std::isnan(startupLogger.getRunJSBundleEndTime())) {
-    result["executeJavaScriptBundleEntryPointEnd"] =
-        startupLogger.getRunJSBundleEndTime();
-  }
-
-  if (!std::isnan(startupLogger.getInitReactRuntimeEndTime())) {
-    result["initializeRuntimeEnd"] = startupLogger.getInitReactRuntimeEndTime();
-  }
-
   if (!std::isnan(startupLogger.getAppStartupEndTime())) {
     result["endTime"] = startupLogger.getAppStartupEndTime();
   }
diff --git a/packages/react-native/src/private/webapis/performance/Performance.js b/packages/react-native/src/private/webapis/performance/Performance.js
index 234d1b3594a..e4f640a732d 100644
--- a/packages/react-native/src/private/webapis/performance/Performance.js
+++ b/packages/react-native/src/private/webapis/performance/Performance.js
@@ -128,19 +128,15 @@ export default class Performance {
   get rnStartupTiming(): ReactNativeStartupTiming {
     const {
       startTime,
-      endTime,
       initializeRuntimeStart,
-      initializeRuntimeEnd,
       executeJavaScriptBundleEntryPointStart,
-      executeJavaScriptBundleEntryPointEnd,
+      endTime,
     } = NativePerformance.getReactNativeStartupTiming();
     return new ReactNativeStartupTiming({
       startTime,
-      endTime,
       initializeRuntimeStart,
-      initializeRuntimeEnd,
       executeJavaScriptBundleEntryPointStart,
-      executeJavaScriptBundleEntryPointEnd,
+      endTime,
     });
   }
 
diff --git a/packages/react-native/src/private/webapis/performance/ReactNativeStartupTiming.js b/packages/react-native/src/private/webapis/performance/ReactNativeStartupTiming.js
index 7ee24fc9929..0bb59bc63aa 100644
--- a/packages/react-native/src/private/webapis/performance/ReactNativeStartupTiming.js
+++ b/packages/react-native/src/private/webapis/performance/ReactNativeStartupTiming.js
@@ -16,9 +16,7 @@ type ReactNativeStartupTimingLike = {
   startTime: ?number,
   endTime: ?number,
   initializeRuntimeStart: ?number,
-  initializeRuntimeEnd: ?number,
   executeJavaScriptBundleEntryPointStart: ?number,
-  executeJavaScriptBundleEntryPointEnd: ?number,
 };
 
 // Read-only object with RN startup timing information.
@@ -29,22 +27,17 @@ export default class ReactNativeStartupTiming {
   // 1. The `ReactNativeStartupTiming` is non-standard API
   // 2. The timing information is relative to the time origin, which means `0` has valid meaning
   #startTime: ?number;
-  #endTime: ?number;
   #initializeRuntimeStart: ?number;
-  #initializeRuntimeEnd: ?number;
   #executeJavaScriptBundleEntryPointStart: ?number;
-  #executeJavaScriptBundleEntryPointEnd: ?number;
+  #endTime: ?number;
 
   constructor(startUpTiming: ?ReactNativeStartupTimingLike) {
     if (startUpTiming != null) {
       this.#startTime = startUpTiming.startTime;
-      this.#endTime = startUpTiming.endTime;
       this.#initializeRuntimeStart = startUpTiming.initializeRuntimeStart;
-      this.#initializeRuntimeEnd = startUpTiming.initializeRuntimeEnd;
       this.#executeJavaScriptBundleEntryPointStart =
         startUpTiming.executeJavaScriptBundleEntryPointStart;
-      this.#executeJavaScriptBundleEntryPointEnd =
-        startUpTiming.executeJavaScriptBundleEntryPointEnd;
+      this.#endTime = startUpTiming.endTime;
     }
   }
 
@@ -56,7 +49,7 @@ export default class ReactNativeStartupTiming {
   }
 
   /**
-   * End time of the RN app startup process. This is equal to `executeJavaScriptBundleEntryPointEnd`.
+   * End time of the RN app startup process.
    */
   get endTime(): ?number {
     return this.#endTime;
@@ -69,26 +62,12 @@ export default class ReactNativeStartupTiming {
     return this.#initializeRuntimeStart;
   }
 
-  /**
-   * End time when RN runtime get initialized. This is the last marker before ends of the app startup process.
-   */
-  get initializeRuntimeEnd(): ?number {
-    return this.#initializeRuntimeEnd;
-  }
-
   /**
    * Start time of JS bundle being executed. This indicates the RN JS bundle is loaded and start to be evaluated.
    */
   get executeJavaScriptBundleEntryPointStart(): ?number {
     return this.#executeJavaScriptBundleEntryPointStart;
   }
-
-  /**
-   * End time of JS bundle being executed. This indicates all the synchronous entry point jobs are finished.
-   */
-  get executeJavaScriptBundleEntryPointEnd(): ?number {
-    return this.#executeJavaScriptBundleEntryPointEnd;
-  }
 }
 
 setPlatformObject(ReactNativeStartupTiming);
diff --git a/packages/rn-tester/js/examples/Performance/PerformanceApiExample.js b/packages/rn-tester/js/examples/Performance/PerformanceApiExample.js
index 3b8180b36c7..cc8f8c4f296 100644
--- a/packages/rn-tester/js/examples/Performance/PerformanceApiExample.js
+++ b/packages/rn-tester/js/examples/Performance/PerformanceApiExample.js
@@ -72,12 +72,6 @@ function StartupTimingExample(): React.Node {
             startUpTiming?.executeJavaScriptBundleEntryPointStart,
           )} ms`}
         </RNTesterText>
-        <RNTesterText>{`executeJavaScriptBundleEntryPointEnd: ${String(
-          startUpTiming?.executeJavaScriptBundleEntryPointEnd,
-        )} ms`}</RNTesterText>
-        <RNTesterText>{`initializeRuntimeEnd: ${String(
-          startUpTiming?.initializeRuntimeEnd,
-        )} ms`}</RNTesterText>
         <RNTesterText>{`endTime: ${String(startUpTiming?.endTime)} ms`}</RNTesterText>
       </View>
     </View>