diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index d8c03800..43284c6d 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -17,9 +17,10 @@ on:
     - cron: "0 6 * * 1"  # weekly, Monday 06:00 UTC
   workflow_dispatch:
 
+# Cancel superseded runs only for pull requests; runs on main are never cancelled.
 concurrency:
-  group: benchmark-${{ github.ref }}
-  cancel-in-progress: true
+  group: benchmark-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 permissions:
   contents: read
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 22e86898..dcf8d177 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,9 +8,12 @@ on:
     - cron: "0 3 * * *"
   workflow_dispatch:
 
+# Only a newer push to the same PR cancels an in-progress run. On main, each
+# merge, the nightly schedule and manual dispatches get their own group and are
+# never cancelled, so every merged commit keeps a complete result.
 concurrency:
-  group: ci-${{ github.ref }}
-  cancel-in-progress: true
+  group: ci-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 # Least privilege by default; jobs that need more (nightly alert issue,
 # coverage-badge push) declare their own elevated permissions.
diff --git a/.github/workflows/perf-regression.yml b/.github/workflows/perf-regression.yml
index dcc7b811..9789d3d5 100644
--- a/.github/workflows/perf-regression.yml
+++ b/.github/workflows/perf-regression.yml
@@ -29,9 +29,11 @@ on:
         type: boolean
         default: false
 
+# Cancel superseded runs only for pull requests; scheduled and manual runs on
+# main never cancel each other.
 concurrency:
-  group: perf-regression-${{ github.ref }}
-  cancel-in-progress: true
+  group: perf-regression-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 permissions:
   contents: read