diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index c5351d6d92631..673ff9d7e8450 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -148,6 +148,8 @@ export const enableOwnerStacks = __EXPERIMENTAL__;
 
 export const enableShallowPropDiffing = false;
 
+export const enableSiblingPrerendering = __EXPERIMENTAL__;
+
 /**
  * Enables an expiration time for retry lanes to avoid starvation.
  */
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
index 2426206bc825d..2d49c56377a2f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
@@ -25,3 +25,4 @@ export const enableShallowPropDiffing = __VARIANT__;
 export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
 export const enableFabricCompleteRootInCommitPhase = __VARIANT__;
 export const enableLazyContextPropagation = __VARIANT__;
+export const enableSiblingPrerendering = __VARIANT__;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index 3618aa70e7d67..6ba5a79ff0f39 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -27,6 +27,7 @@ export const {
   enableShallowPropDiffing,
   passChildrenWhenCloningPersistedNodes,
   enableLazyContextPropagation,
+  enableSiblingPrerendering,
 } = dynamicFlags;
 
 // The rest of the flags are static for better dead code elimination.
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 2aae8bd3d1c65..4e50442c2579f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -84,6 +84,7 @@ export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const useModernStrictMode = true;
+export const enableSiblingPrerendering = false;
 
 // Profiling Only
 export const enableProfilerTimer = __PROFILE__;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index c44e7014fc444..ae211b9ec4639 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -80,6 +80,7 @@ export const enableAddPropertiesFastPath = false;
 
 export const renameElementSymbol = true;
 export const enableShallowPropDiffing = false;
+export const enableSiblingPrerendering = __EXPERIMENTAL__;
 
 // TODO: This must be in sync with the main ReactFeatureFlags file because
 // the Test Renderer's value must be the same as the one used by the
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
index bc7ddf85acc03..ebc3ddab2a551 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
@@ -80,6 +80,7 @@ export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const useModernStrictMode = true;
 export const enableFabricCompleteRootInCommitPhase = false;
+export const enableSiblingPrerendering = false;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index 57f60c24aef45..a378ab3edf17c 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -94,6 +94,7 @@ export const renameElementSymbol = false;
 export const enableObjectFiber = false;
 export const enableOwnerStacks = false;
 export const enableShallowPropDiffing = false;
+export const enableSiblingPrerendering = false;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index 465fa58590bcc..e207dbb71b669 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -35,6 +35,7 @@ export const {
   retryLaneExpirationMs,
   syncLaneExpirationMs,
   transitionLaneExpirationMs,
+  enableSiblingPrerendering,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.