diff --git a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/MulticastDelegate.cs b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/MulticastDelegate.cs
index 9b098a069274..f6bb551c275f 100644
--- a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/MulticastDelegate.cs
+++ b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/MulticastDelegate.cs
@@ -107,7 +107,7 @@ public override sealed int GetHashCode()
 
         // Force inline as the true/false ternary takes it above ALWAYS_INLINE size even though the asm ends up smaller
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool operator ==(MulticastDelegate d1, MulticastDelegate d2)
+        public static bool operator ==(MulticastDelegate? d1, MulticastDelegate? d2)
         {
             // Test d2 first to allow branch elimination when inlined for null checks (== null)
             // so it can become a simple test
@@ -122,7 +122,7 @@ public override sealed int GetHashCode()
 
         // Force inline as the true/false ternary takes it above ALWAYS_INLINE size even though the asm ends up smaller
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool operator !=(MulticastDelegate d1, MulticastDelegate d2)
+        public static bool operator !=(MulticastDelegate? d1, MulticastDelegate? d2)
         {
             // Can't call the == operator as it will call object==
 
diff --git a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/RuntimeTypeHandle.cs b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/RuntimeTypeHandle.cs
index 194a5f710775..a36114cdf971 100644
--- a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/RuntimeTypeHandle.cs
+++ b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/RuntimeTypeHandle.cs
@@ -60,28 +60,28 @@ public bool Equals(RuntimeTypeHandle handle)
             }
         }
 
-        public static bool operator ==(object left, RuntimeTypeHandle right)
+        public static bool operator ==(object? left, RuntimeTypeHandle right)
         {
             if (left is RuntimeTypeHandle)
                 return right.Equals((RuntimeTypeHandle)left);
             return false;
         }
 
-        public static bool operator ==(RuntimeTypeHandle left, object right)
+        public static bool operator ==(RuntimeTypeHandle left, object? right)
         {
             if (right is RuntimeTypeHandle)
                 return left.Equals((RuntimeTypeHandle)right);
             return false;
         }
 
-        public static bool operator !=(object left, RuntimeTypeHandle right)
+        public static bool operator !=(object? left, RuntimeTypeHandle right)
         {
             if (left is RuntimeTypeHandle)
                 return !right.Equals((RuntimeTypeHandle)left);
             return true;
         }
 
-        public static bool operator !=(RuntimeTypeHandle left, object right)
+        public static bool operator !=(RuntimeTypeHandle left, object? right)
         {
             if (right is RuntimeTypeHandle)
                 return !left.Equals((RuntimeTypeHandle)right);
diff --git a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Threading/Interlocked.cs b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Threading/Interlocked.cs
index 97ba82912292..86a408204294 100644
--- a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Threading/Interlocked.cs
+++ b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Threading/Interlocked.cs
@@ -3,6 +3,7 @@
 
 using System.Runtime;
 using System.Runtime.CompilerServices;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.Versioning;
 
 using Internal.Runtime.CompilerServices;
@@ -49,13 +50,15 @@ public static unsafe double CompareExchange(ref double location1, double value,
 
         [Intrinsic]
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static T CompareExchange<T>(ref T location1, T value, T comparand) where T : class
+        [return: NotNullIfNotNull("location1")]
+        public static T CompareExchange<T>(ref T location1, T value, T comparand) where T : class?
         {
             return Unsafe.As<T>(RuntimeImports.InterlockedCompareExchange(ref Unsafe.As<T, object>(ref location1), value, comparand));
         }
 
         [Intrinsic]
-        public static object CompareExchange(ref object location1, object value, object comparand)
+        [return: NotNullIfNotNull("location1")]
+        public static object? CompareExchange(ref object? location1, object? value, object? comparand)
         {
             return RuntimeImports.InterlockedCompareExchange(ref location1, value, comparand);
         }
@@ -121,13 +124,15 @@ public static unsafe double Exchange(ref double location1, double value)
 
         [Intrinsic]
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static T Exchange<T>(ref T location1, T value) where T : class
+        [return: NotNullIfNotNull("location1")]
+        public static T Exchange<T>([NotNullIfNotNull("value")] ref T location1, T value) where T : class?
         {
-            return Unsafe.As<T>(RuntimeImports.InterlockedExchange(ref Unsafe.As<T, object>(ref location1), value));
+            return Unsafe.As<T>(RuntimeImports.InterlockedExchange(ref Unsafe.As<T, object>(ref location1!), value));
         }
 
         [Intrinsic]
-        public static object Exchange(ref object location1, object value)
+        [return: NotNullIfNotNull("location1")]
+        public static object? Exchange([NotNullIfNotNull("value")] ref object? location1, object? value)
         {
             return RuntimeImports.InterlockedExchange(ref location1, value);
         }
diff --git a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Type.CoreRT.cs b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Type.CoreRT.cs
index 737c8b248b67..0b3437640cf7 100644
--- a/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Type.CoreRT.cs
+++ b/src/coreclr/src/nativeaot/System.Private.CoreLib/src/System/Type.CoreRT.cs
@@ -84,7 +84,7 @@ private static Type GetTypeFromEETypePtrSlow(EETypePtr eeType, ref GCHandle hand
         public static Type GetType(string typeName, Func<AssemblyName, Assembly> assemblyResolver, Func<Assembly, string, bool, Type> typeResolver, bool throwOnError, bool ignoreCase) => RuntimeAugments.Callbacks.GetType(typeName, assemblyResolver, typeResolver, throwOnError: throwOnError, ignoreCase: ignoreCase, defaultAssembly: null);
 
         [Intrinsic]
-        public static bool operator ==(Type left, Type right)
+        public static bool operator ==(Type? left, Type? right)
         {
             if (object.ReferenceEquals(left, right))
                 return true;
@@ -102,7 +102,7 @@ private static Type GetTypeFromEETypePtrSlow(EETypePtr eeType, ref GCHandle hand
         }
 
         [Intrinsic]
-        public static bool operator !=(Type left, Type right) => !(left == right);
+        public static bool operator !=(Type? left, Type? right) => !(left == right);
 
         public bool IsRuntimeImplemented() => this is IRuntimeImplemented; // Not an api but needs to be public because of Reflection.Core/CoreLib divide.
     }