diff --git a/src/ast/simplifiers/cnf_nnf.h b/src/ast/simplifiers/cnf_nnf.h
new file mode 100644
index 00000000000..eb80387d6e5
--- /dev/null
+++ b/src/ast/simplifiers/cnf_nnf.h
@@ -0,0 +1,57 @@
+/*++
+Copyright (c) 2022 Microsoft Corporation
+
+Module Name:
+
+    cnf_nnf.h
+
+Abstract:
+
+    pull nested quantifiers
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2022-11-24
+
+--*/
+
+#pragma once
+
+#include "ast/simplifiers/dependent_expr_state.h"
+#include "ast/normal_forms/pull_quant.h"
+
+
+class cnf_nnf_simplifier : public dependent_expr_simplifier {
+
+    defined_names m_defined_names;
+    
+public:
+    cnf_nnf_simplifier(ast_manager& m, params_ref const& p, dependent_expr_state& fmls):
+        dependent_expr_simplifier(m, fmls),
+        m_pull(m) {
+    }
+
+    char const* name() const override { return "cnf-nnf"; }
+    
+    void reduce() override {
+        nnf apply_nnf(m, m_defined_names);
+        expr_ref_vector  push_todo(m);
+        proof_ref_vector push_todo_prs(m);
+        proof_ref pr(m);
+        expr_ref r(m);
+        unsigned sz = qtail();
+        for (unsigned i = qhead(); i < sz && m.inc(); ++i) {
+            auto d = m_fmls[idx];                
+            push_todo.reset();
+            push_todo_prs.reset();
+            apply_nnf(d.fml(), push_todo, push_todo_prs, r, pr);
+            m_fmls.update(i, dependent_expr(m, r, d.dep()));
+            for (expr* f : m_push_todo) {
+                if (!m.inc())
+                    break;
+                m_rewriter(f, r, pr);
+                m_fmls.add(i, depdendent_expr(m, r, d.dep()));
+            }
+        }
+    }
+};