diff --git a/ReactCommon/react/renderer/animations/LayoutAnimationDriver.cpp b/ReactCommon/react/renderer/animations/LayoutAnimationDriver.cpp
index 5386b237a0e..b981d1aa5c9 100644
--- a/ReactCommon/react/renderer/animations/LayoutAnimationDriver.cpp
+++ b/ReactCommon/react/renderer/animations/LayoutAnimationDriver.cpp
@@ -74,7 +74,7 @@ void LayoutAnimationDriver::animationMutationsForFrame(
 
       // Create the mutation instruction
       auto updateMutation = ShadowViewMutation::UpdateMutation(
-          keyframe.parentView, keyframe.viewPrev, mutatedShadowView, -1);
+          keyframe.viewPrev, mutatedShadowView);
 
       // All generated Update mutations must have an "old" and "new"
       // ShadowView. Checking for nonzero tag doesn't guarantee that the views
diff --git a/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp b/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp
index 24a8fb9296c..48d652328d8 100644
--- a/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp
+++ b/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp
@@ -1252,10 +1252,7 @@ LayoutAnimationKeyFrameManager::pullTransaction(
               1, keyFrame.viewStart, keyFrame.viewEnd);
           auto generatedPenultimateMutation =
               ShadowViewMutation::UpdateMutation(
-                  keyFrame.parentView,
-                  keyFrame.viewPrev,
-                  mutatedShadowView,
-                  -1);
+                  keyFrame.viewPrev, mutatedShadowView);
           assert(generatedPenultimateMutation.oldChildShadowView.tag != 0);
           assert(generatedPenultimateMutation.newChildShadowView.tag != 0);
           PrintMutationInstruction(
@@ -1264,7 +1261,7 @@ LayoutAnimationKeyFrameManager::pullTransaction(
           finalConflictingMutations.push_back(generatedPenultimateMutation);
 
           auto generatedMutation = ShadowViewMutation::UpdateMutation(
-              keyFrame.parentView, mutatedShadowView, keyFrame.viewEnd, -1);
+              mutatedShadowView, keyFrame.viewEnd);
           assert(generatedMutation.oldChildShadowView.tag != 0);
           assert(generatedMutation.newChildShadowView.tag != 0);
           PrintMutationInstruction(
@@ -1437,10 +1434,7 @@ LayoutAnimationKeyFrameManager::pullTransaction(
               1, keyFrame.viewStart, keyFrame.viewEnd);
           auto generatedPenultimateMutation =
               ShadowViewMutation::UpdateMutation(
-                  keyFrame.parentView,
-                  keyFrame.viewPrev,
-                  mutatedShadowView,
-                  -1);
+                  keyFrame.viewPrev, mutatedShadowView);
           assert(generatedPenultimateMutation.oldChildShadowView.tag != 0);
           assert(generatedPenultimateMutation.newChildShadowView.tag != 0);
           PrintMutationInstruction(
@@ -1450,7 +1444,7 @@ LayoutAnimationKeyFrameManager::pullTransaction(
               generatedPenultimateMutation);
 
           auto generatedMutation = ShadowViewMutation::UpdateMutation(
-              keyFrame.parentView, mutatedShadowView, keyFrame.viewEnd, -1);
+              mutatedShadowView, keyFrame.viewEnd);
           assert(generatedMutation.oldChildShadowView.tag != 0);
           assert(generatedMutation.newChildShadowView.tag != 0);
           PrintMutationInstruction(
diff --git a/ReactCommon/react/renderer/mounting/Differentiator.cpp b/ReactCommon/react/renderer/mounting/Differentiator.cpp
index eb2fa09a3e8..f4e798b31eb 100644
--- a/ReactCommon/react/renderer/mounting/Differentiator.cpp
+++ b/ReactCommon/react/renderer/mounting/Differentiator.cpp
@@ -486,10 +486,7 @@ static void calculateShadowViewMutationsFlattener(
           newTreeNodePair.isConcreteView && oldTreeNodePair.isConcreteView) {
         mutationInstructionContainer.updateMutations.push_back(
             ShadowViewMutation::UpdateMutation(
-                parentShadowView,
-                oldTreeNodePair.shadowView,
-                newTreeNodePair.shadowView,
-                newTreeNodePair.mountIndex));
+                oldTreeNodePair.shadowView, newTreeNodePair.shadowView));
       }
 
       // Update children if appropriate.
@@ -850,10 +847,7 @@ static void calculateShadowViewMutationsV2(
     if (newChildPair.isConcreteView &&
         oldChildPair.shadowView != newChildPair.shadowView) {
       updateMutations.push_back(ShadowViewMutation::UpdateMutation(
-          parentShadowView,
-          oldChildPair.shadowView,
-          newChildPair.shadowView,
-          newChildPair.mountIndex));
+          oldChildPair.shadowView, newChildPair.shadowView));
     }
 
     // Recursively update tree if ShadowNode pointers are not equal
@@ -995,10 +989,7 @@ static void calculateShadowViewMutationsV2(
             // concrete view. The case where they're different is handled above.
             if (oldChildPair.shadowView != newChildPair.shadowView) {
               updateMutations.push_back(ShadowViewMutation::UpdateMutation(
-                  parentShadowView,
-                  oldChildPair.shadowView,
-                  newChildPair.shadowView,
-                  newChildPair.mountIndex));
+                  oldChildPair.shadowView, newChildPair.shadowView));
             }
 
             // Remove from newRemainingPairs
@@ -1251,10 +1242,7 @@ static void calculateShadowViewMutationsV2(
 
             if (oldChildPair.shadowView != newChildPair.shadowView) {
               updateMutations.push_back(ShadowViewMutation::UpdateMutation(
-                  parentShadowView,
-                  oldChildPair.shadowView,
-                  newChildPair.shadowView,
-                  newChildPair.mountIndex));
+                  oldChildPair.shadowView, newChildPair.shadowView));
             }
           }
           if (!oldChildPair.flattened &&
@@ -1516,7 +1504,7 @@ ShadowViewMutation::List calculateShadowViewMutations(
 
   if (oldRootShadowView != newRootShadowView) {
     mutations.push_back(ShadowViewMutation::UpdateMutation(
-        ShadowView(), oldRootShadowView, newRootShadowView, -1));
+        oldRootShadowView, newRootShadowView));
   }
 
   calculateShadowViewMutationsV2(
diff --git a/ReactCommon/react/renderer/mounting/ShadowViewMutation.cpp b/ReactCommon/react/renderer/mounting/ShadowViewMutation.cpp
index 9b8d966a3c1..dbf4afd227c 100644
--- a/ReactCommon/react/renderer/mounting/ShadowViewMutation.cpp
+++ b/ReactCommon/react/renderer/mounting/ShadowViewMutation.cpp
@@ -57,16 +57,14 @@ ShadowViewMutation ShadowViewMutation::RemoveMutation(
 }
 
 ShadowViewMutation ShadowViewMutation::UpdateMutation(
-    ShadowView parentShadowView,
     ShadowView oldChildShadowView,
-    ShadowView newChildShadowView,
-    int index) {
+    ShadowView newChildShadowView) {
   return {
       /* .type = */ Update,
-      /* .parentShadowView = */ parentShadowView,
+      /* .parentShadowView = */ {},
       /* .oldChildShadowView = */ oldChildShadowView,
       /* .newChildShadowView = */ newChildShadowView,
-      /* .index = */ index,
+      /* .index = */ -1,
   };
 }
 
diff --git a/ReactCommon/react/renderer/mounting/ShadowViewMutation.h b/ReactCommon/react/renderer/mounting/ShadowViewMutation.h
index 07ee6bcaf7e..3bd0067d5fd 100644
--- a/ReactCommon/react/renderer/mounting/ShadowViewMutation.h
+++ b/ReactCommon/react/renderer/mounting/ShadowViewMutation.h
@@ -55,10 +55,8 @@ struct ShadowViewMutation final {
    * Creates and returns an `Update` mutation.
    */
   static ShadowViewMutation UpdateMutation(
-      ShadowView parentShadowView,
       ShadowView oldChildShadowView,
-      ShadowView newChildShadowView,
-      int index);
+      ShadowView newChildShadowView);
 
 #pragma mark - Type
 
@@ -70,7 +68,7 @@ struct ShadowViewMutation final {
   ShadowView parentShadowView = {};
   ShadowView oldChildShadowView = {};
   ShadowView newChildShadowView = {};
-  int index = {};
+  int index = -1;
 };
 
 using ShadowViewMutationList = std::vector<ShadowViewMutation>;