diff --git a/nodes/src/nodes/store_pinecone/IGlobal.py b/nodes/src/nodes/store_pinecone/IGlobal.py
index c6401ffc7..c849e9005 100644
--- a/nodes/src/nodes/store_pinecone/IGlobal.py
+++ b/nodes/src/nodes/store_pinecone/IGlobal.py
@@ -25,6 +25,7 @@
 # This class controls the data shared between all threads for the task
 # ------------------------------------------------------------------------------
 
+import hashlib
 import os
 import re
 from typing import Any, Dict
@@ -45,8 +46,9 @@ def _open_store(self, logical_type: str, conn_config: Dict[str, Any], bag: Dict[
         return Store(logical_type, conn_config, bag)
 
     def _sub_key(self) -> str:
-        """Return the transform sub-key: host/port/collection."""
-        return f'{self.store.host}/{self.store.port}/{self.store.collection}'
+        """Return the transform sub-key without leaking the Pinecone API key."""
+        account = hashlib.sha256((self.store.apikey or '').encode()).hexdigest()[:12]
+        return f'{account}/{self.store.profile}/{self.store.collection}'
 
     def _probe_connection(self, config: Dict[str, Any]) -> None:
         """
diff --git a/nodes/src/nodes/store_pinecone/README.md b/nodes/src/nodes/store_pinecone/README.md
index e9b78e9d9..274f94d36 100644
--- a/nodes/src/nodes/store_pinecone/README.md
+++ b/nodes/src/nodes/store_pinecone/README.md
@@ -99,6 +99,8 @@ The tool path runs on the control plane and does not pass through the pipeline's
 
 Set `apikey` to your Pinecone API key. The key is used during both config validation (HTTP client) and runtime data operations (gRPC client). There are no additional auth modes - Pinecone uses API-key-only authentication.
 
+Changing the API key, profile, or index changes the transform key used to track ingested objects. Existing Pinecone pipelines may re-ingest once after upgrading from versions that keyed only by index name.
+
 ---
 
 <!-- ROCKETRIDE:GENERATED:PARAMS START -->
diff --git a/nodes/test/store_pinecone/test_transform_sub_key.py b/nodes/test/store_pinecone/test_transform_sub_key.py
new file mode 100644
index 000000000..7325628e0
--- /dev/null
+++ b/nodes/test/store_pinecone/test_transform_sub_key.py
@@ -0,0 +1,59 @@
+import importlib.util
+import sys
+from pathlib import Path
+from types import ModuleType, SimpleNamespace
+
+
+class StoreGlobalBase:
+    pass
+
+
+ai = ModuleType('ai')
+ai_common = ModuleType('ai.common')
+ai_common_store = ModuleType('ai.common.store')
+ai_common_store.StoreGlobalBase = StoreGlobalBase
+rocketlib = ModuleType('rocketlib')
+rocketlib.warning = lambda message: None
+
+path = Path(__file__).parents[2] / 'src/nodes/store_pinecone/IGlobal.py'
+spec = importlib.util.spec_from_file_location('store_pinecone_IGlobal', path)
+assert spec is not None
+module = importlib.util.module_from_spec(spec)
+assert spec.loader is not None
+stubs = {
+    'ai': ai,
+    'ai.common': ai_common,
+    'ai.common.store': ai_common_store,
+    'rocketlib': rocketlib,
+}
+originals = {name: sys.modules.get(name) for name in stubs}
+sys.modules.update(stubs)
+try:
+    spec.loader.exec_module(module)
+finally:
+    for name, original in originals.items():
+        if original is None:
+            del sys.modules[name]
+        else:
+            sys.modules[name] = original
+IGlobal = module.IGlobal
+
+
+def _sub_key(apikey: str, profile: str = 'serverless-dense', collection: str = 'shared-index') -> str:
+    glb = IGlobal.__new__(IGlobal)
+    glb.store = SimpleNamespace(apikey=apikey, profile=profile, collection=collection)
+    return glb._sub_key()
+
+
+def test_sub_key_distinguishes_accounts_without_leaking_api_key() -> None:
+    first = _sub_key('pcsk_first_secret')
+    second = _sub_key('pcsk_second_secret')
+
+    assert first != second
+    assert first.endswith('/serverless-dense/shared-index')
+    assert 'pcsk_first_secret' not in first
+    assert 'pcsk_second_secret' not in second
+
+
+def test_sub_key_includes_profile_and_collection() -> None:
+    assert _sub_key('pcsk_secret', 'pod-based', 'other-index').endswith('/pod-based/other-index')