diff --git a/llvm/utils/extract_symbols.py b/llvm/utils/extract_symbols.py
index 14f9ca74db86..18f005a6fb74 100755
--- a/llvm/utils/extract_symbols.py
+++ b/llvm/utils/extract_symbols.py
@@ -158,6 +158,38 @@ def should_keep_microsoft_symbol(symbol, calling_convention_decoration):
         # private to clang/lib/AST/ByteCode, so no plugin can reference them.
         if "@interp@clang@@" in symbol:
             return None
+        # anchor(): empty virtual functions whose only purpose is to anchor a
+        # class's vtable to a single TU; never called by name from elsewhere.
+        # Exception: base classes that are directly subclassed or instantiated
+        # outside the DLL need anchor() exported so the linker can fill in the
+        # inherited vtable slot in plugins (raw_ostream and raw_pwrite_stream are
+        # needed because raw_string_ostream / raw_svector_ostream subclasses are
+        # created in the plugin and don't override anchor()).
+        if symbol.startswith("?anchor@") and not symbol.startswith(
+            (
+                "?anchor@PluginASTAction@clang@@",
+                "?anchor@raw_ostream@llvm@@",
+                "?anchor@raw_pwrite_stream@llvm@@",
+            )
+        ):
+            return None
+        # Profile(): FoldingSetTrait / FoldingSetNode hash methods, used only
+        # by LLVM's internal hash-consing machinery.
+        if symbol.startswith("?Profile@"):
+            return None
+        # cloneImpl(): private virtual on llvm::MDNode subclasses; only the
+        # public clone() entry point needs to be reachable.
+        if symbol.startswith("?cloneImpl@"):
+            return None
+        # getAnalysisUsage()/releaseMemory(): LLVM Pass virtual overrides
+        # dispatched through the legacy pass manager's vtables.
+        if symbol.startswith(("?getAnalysisUsage@", "?releaseMemory@")):
+            return None
+        # Virtual overrides on cl::parser / cl::opt / cl::OptionValue template
+        # instantiations are invoked by the CommandLine library through the
+        # generic_parser_base / Option vtables, never imported by name.
+        if re.search(r"@\?\$(parser|opt|OptionValue)@.+@cl@llvm@@", symbol):
+            return None
         return symbol
     # Keep mangled global variables and static class members in llvm:: namespace.
     # These have a type mangling that looks like (this is derived from