diff --git a/csharp/extractor/Semmle.Extraction.CSharp/CodeAnalysisExtensions/SymbolExtensions.cs b/csharp/extractor/Semmle.Extraction.CSharp/CodeAnalysisExtensions/SymbolExtensions.cs
index 4026263c3843e..7ee3be2112286 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp/CodeAnalysisExtensions/SymbolExtensions.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/CodeAnalysisExtensions/SymbolExtensions.cs
@@ -648,5 +648,17 @@ public static IEnumerable<AnnotatedTypeSymbol> GetAnnotatedTypeArguments(this IN
         /// </summary>
         public static bool IsPublicOrProtected(this ISymbol symbol) =>
             symbol.DeclaredAccessibility == Accessibility.Public || symbol.DeclaredAccessibility == Accessibility.Protected;
+
+        /// <summary>
+        /// Returns true if the given symbol should be extracted in this context.
+        /// </summary>
+        public static bool ShouldExtractSymbol(this ISymbol symbol) =>
+            symbol.Locations.Any(x => !x.IsInMetadata) || symbol.IsPublicOrProtected();
+
+        /// <summary>
+        /// Returns the symbols that should be extracted in the given context.
+        /// </summary>
+        public static IEnumerable<T> ToExtract<T>(this IEnumerable<T> symbols) where T : ISymbol =>
+            symbols.Where(symbol => symbol.ShouldExtractSymbol());
     }
 }
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Entities/Method.cs b/csharp/extractor/Semmle.Extraction.CSharp/Entities/Method.cs
index 6890ca4908476..6ba5cca01cf62 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp/Entities/Method.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Entities/Method.cs
@@ -101,7 +101,7 @@ public void Overrides(TextWriter trapFile)
                 }
             }
 
-            if (Symbol.OverriddenMethod is not null)
+            if (Symbol.OverriddenMethod is not null && Symbol.OverriddenMethod.ShouldExtractSymbol())
             {
                 trapFile.overrides(this, Method.Create(Context, Symbol.OverriddenMethod));
             }
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Entities/Types/Type.cs b/csharp/extractor/Semmle.Extraction.CSharp/Entities/Types/Type.cs
index ac860b2e3e156..4a7677d6aa44e 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp/Entities/Types/Type.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Entities/Types/Type.cs
@@ -228,24 +228,20 @@ private void ExtractParametersForDelegateLikeType(TextWriter trapFile, IMethodSy
         /// Called to extract members and nested types.
         /// This is called on each member of a namespace,
         /// in either source code or an assembly.
-        /// <param name="onlyEffectivelyPublic">If true, only extract members that are effectively public otherwise extract all members.</param>
         /// </summary>
-        public void ExtractRecursive(bool onlyEffectivelyPublic = false)
+        public void ExtractRecursive()
         {
             foreach (var l in Symbol.DeclaringSyntaxReferences.Select(s => s.GetSyntax().GetLocation()))
             {
                 Context.BindComments(this, l);
             }
 
-            foreach (var member in Symbol.GetMembers())
+            foreach (var member in Symbol.GetMembers().ToExtract())
             {
-                if (onlyEffectivelyPublic && !member.IsPublicOrProtected())
-                    continue;
-
                 switch (member.Kind)
                 {
                     case SymbolKind.NamedType:
-                        Create(Context, (ITypeSymbol)member).ExtractRecursive(onlyEffectivelyPublic);
+                        Create(Context, (ITypeSymbol)member).ExtractRecursive();
                         break;
                     default:
                         Context.CreateEntity(member);
@@ -266,16 +262,16 @@ public void PopulateGenerics()
 
                 var members = new List<ISymbol>();
 
-                foreach (var member in Symbol.GetMembers())
+                foreach (var member in Symbol.GetMembers().ToExtract())
                     members.Add(member);
-                foreach (var member in Symbol.GetTypeMembers())
+                foreach (var member in Symbol.GetTypeMembers().ToExtract())
                     members.Add(member);
 
                 // Mono extractor puts all BASE interface members as members of the current interface.
 
                 if (Symbol.TypeKind == TypeKind.Interface)
                 {
-                    foreach (var baseInterface in Symbol.Interfaces)
+                    foreach (var baseInterface in Symbol.Interfaces.ToExtract())
                     {
                         foreach (var member in baseInterface.GetMembers())
                             members.Add(member);
@@ -289,10 +285,10 @@ public void PopulateGenerics()
                     Context.CreateEntity(member);
                 }
 
-                if (Symbol.BaseType is not null)
+                if (Symbol.BaseType is not null && Symbol.BaseType.ShouldExtractSymbol())
                     Create(Context, Symbol.BaseType).PopulateGenerics();
 
-                foreach (var i in Symbol.Interfaces)
+                foreach (var i in Symbol.Interfaces.ToExtract())
                 {
                     Create(Context, i).PopulateGenerics();
                 }
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Analyser.cs b/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Analyser.cs
index 7e82a76ac42b7..8b8f4613c43e3 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Analyser.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Analyser.cs
@@ -271,9 +271,9 @@ private static void AnalyseNamespace(Context cx, INamespaceSymbol ns)
 
             foreach (var memberType in ns.GetTypeMembers())
             {
-                if (memberType.IsPublicOrProtected())
+                if (memberType.ShouldExtractSymbol())
                 {
-                    Entities.Type.Create(cx, memberType).ExtractRecursive(onlyEffectivelyPublic: true);
+                    Entities.Type.Create(cx, memberType).ExtractRecursive();
                 }
             }
         }
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Context.cs b/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Context.cs
index 67bb2808ae620..2408d3a7cdbf7 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Context.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Extractor/Context.cs
@@ -550,6 +550,7 @@ public bool Defines(ISymbol symbol) =>
             !SymbolEqualityComparer.Default.Equals(symbol, symbol.OriginalDefinition) ||
             scope.InScope(symbol);
 
+
         /// <summary>
         /// Runs the given action <paramref name="a"/>, guarding for trap duplication
         /// based on key <paramref name="key"/>.