diff --git a/analysis/events_to_cumulative.py b/analysis/events_to_cumulative.py
index 161c66b..268bbbf 100644
--- a/analysis/events_to_cumulative.py
+++ b/analysis/events_to_cumulative.py
@@ -20,7 +20,7 @@
 # per-round prefix so zero-event seeding produces one entry per round instead of
 # collapsing every round into a single "unknown" run. Mirrors analyze.py.
 MATRIX_RUN_PREFIX_RE = re.compile(r"^(?P<run_id>.*logs\.zip)-(?P<name>.+)$")
-IGNORED_LOG_FILENAMES = {"runner_commands.log"}
+IGNORED_LOG_FILENAMES = {"foundry_showmap.log", "runner_commands.log"}
 
 
 def die(msg: str) -> None:
diff --git a/analysis/tests/test_analyze_log_filtering.py b/analysis/tests/test_analyze_log_filtering.py
index eb9793e..962a4d4 100644
--- a/analysis/tests/test_analyze_log_filtering.py
+++ b/analysis/tests/test_analyze_log_filtering.py
@@ -7,6 +7,26 @@
 
 
 class AnalyzeLogFilteringTests(unittest.TestCase):
+    def test_cumulative_inventory_ignores_foundry_showmap_replay(self):
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            logs_dir = Path(tmp_dir)
+            instance_dir = logs_dir / "i-abcd1234-foundry-git-test"
+            instance_dir.mkdir(parents=True)
+            (instance_dir / "foundry_showmap.log").write_text(
+                '{"timestamp":1000,"event":"failure",'
+                '"invariant":"replay_only_failure",'
+                '"target":"CryticToFoundry"}\n',
+                encoding="utf-8",
+            )
+
+            self.assertEqual(analyze.discover_log_files(logs_dir), ())
+            self.assertEqual(
+                build_cumulative_rows(
+                    [], include_zero=True, logs_dir=logs_dir, run_id="run-1"
+                ),
+                [],
+            )
+
     def test_foundry_showmap_replay_is_not_parsed_as_benchmark_data(self):
         with tempfile.TemporaryDirectory() as tmp_dir:
             logs_dir = Path(tmp_dir)