diff --git a/test_runner/duplicate_tenant.py b/test_runner/duplicate_tenant.py
new file mode 100644
index 0000000000..c0672718ad
--- /dev/null
+++ b/test_runner/duplicate_tenant.py
@@ -0,0 +1,43 @@
+# Usage from top of repo:
+#  poetry run python3 test_runner/duplicate_tenant.py b97965931096047b2d54958756baee7b 10
+from queue import Queue
+import sys
+import threading
+
+import requests
+from fixtures.pageserver.http import PageserverHttpClient
+from fixtures.types import TenantId
+
+initial_tenant = sys.argv[1]
+ncopies = int(sys.argv[2])
+numthreads = int(sys.argv[3])
+
+
+# class DuckTypedNeonEnv:
+#     pass
+
+
+# cli = NeonCli(DuckTypedNeonEnv())
+
+q = Queue()
+for i in range(0, ncopies):
+    q.put(i)
+
+for i in range(0, numthreads):
+    q.put(None)
+
+
+def create():
+    while True:
+        if q.get() == None:
+            break
+        new_tenant = TenantId.generate()
+        res = requests.post(
+            f"http://localhost:9898/v1/tenant/{initial_tenant}/duplicate",
+            json={"new_tenant_id": str(new_tenant)},
+        )
+        res.raise_for_status()
+
+
+for i in range(0, numthreads):
+    threading.Thread(target=create).start()