diff --git a/docs/ncu-ci.md b/docs/ncu-ci.md
index b4794eff..a748721b 100644
--- a/docs/ncu-ci.md
+++ b/docs/ncu-ci.md
@@ -81,6 +81,8 @@ workload=$(ncu-ci workload) || exit 0
 
 `ncu-ci rate <type>` calculate the success rate for CI jobs in the last 100 runs per [CI Health History](https://github.com/nodejs/reliability#ci-health-history), where `<type>` can be either `pr` for `node-test-pull-request` or `commit` for `node-test-commit`. See `ncu-ci rate --help` for more.
 
+Builds targeting the `nodejs-private` organization are excluded from the counts.
+
 Examples:
 
 ```sh
@@ -109,6 +111,9 @@ node on git:main ❯ ncu-ci rate commit
 
 `ncu-ci walk <type>` walks CI and displays failures, where `<type>` can be either `pr` for `node-test-pull-request` or `commit` for `node-test-commit`. See `ncu-ci walk --help` for more.
 
+Builds targeting the `nodejs-private` organization are excluded from the health
+summary and failure report.
+
 Example:
 ```sh
 node on git:main ❯ ncu-ci walk commit
diff --git a/lib/ci/ci_utils.js b/lib/ci/ci_utils.js
index 15d9694b..50183540 100644
--- a/lib/ci/ci_utils.js
+++ b/lib/ci/ci_utils.js
@@ -66,13 +66,16 @@ function filterBuild(builds, type) {
 export async function listBuilds(cli, request, type, since) {
   // assert(type === COMMIT || type === PR)
   const { jobName } = CI_TYPES.get(type);
-  const tree = 'builds[url,result,timestamp]';
+  const tree = 'builds[url,result,timestamp,actions[parameters[name,value]]]';
   const url = `https://${CI_DOMAIN}/job/${jobName}/api/json?tree=${qs.escape(tree)}`;
 
   cli.startSpinner(`Querying ${url}`);
 
   const result = await request.json(url);
-  let builds = result.builds;
+  let builds = result.builds.filter(build => !build.actions?.some(action =>
+    action.parameters?.some(({ name, value }) =>
+      (name === 'TARGET_GITHUB_ORG' || name === 'GITHUB_ORG') &&
+      typeof value === 'string' && value.toLowerCase() === 'nodejs-private')));
   if (since) {
     builds = builds.filter(build => build.timestamp > since);
   }
diff --git a/lib/ci/failure_aggregator.js b/lib/ci/failure_aggregator.js
index 5355eeed..7905b5a5 100644
--- a/lib/ci/failure_aggregator.js
+++ b/lib/ci/failure_aggregator.js
@@ -93,15 +93,18 @@ export class FailureAggregator {
       aggregates = this.aggregates = this.aggregate();
     }
 
-    const last = parseJobFromURL(this.failures[0].upstream);
-    const first = parseJobFromURL(
-      this.failures[this.failures.length - 1].upstream
-    );
-    const jobName = CI_TYPES.get(first.type).jobName;
-    let output = 'Failures in ';
-    output += `[${jobName}/${first.jobid}](${first.link}) to `;
-    output += `[${jobName}/${last.jobid}](${last.link}) `;
-    output += 'that failed 2 or more PRs\n';
+    let output = 'No failures to report\n';
+    if (this.failures.length > 0) {
+      const last = parseJobFromURL(this.failures[0].upstream);
+      const first = parseJobFromURL(
+        this.failures[this.failures.length - 1].upstream
+      );
+      const jobName = CI_TYPES.get(first.type).jobName;
+      output = 'Failures in ';
+      output += `[${jobName}/${first.jobid}](${first.link}) to `;
+      output += `[${jobName}/${last.jobid}](${last.link}) `;
+      output += 'that failed 2 or more PRs\n';
+    }
     output += '(Generated with `ncu-ci ';
     output += `${process.argv.slice(2).join(' ')}\`)\n\n`;
 
diff --git a/test/unit/ci_failure_aggregator.test.js b/test/unit/ci_failure_aggregator.test.js
index f011b25c..1f07f699 100644
--- a/test/unit/ci_failure_aggregator.test.js
+++ b/test/unit/ci_failure_aggregator.test.js
@@ -20,6 +20,18 @@ function failure(prid, jobid, targetBranch, reason = 'Example failure') {
 const health = { formatAsMarkdown: () => 'Health summary\n' };
 
 describe('Failure aggregation target branches', () => {
+  it('reports health when no failures remain', () => {
+    const cli = new TestCLI();
+    const aggregator = new FailureAggregator(cli, [health]);
+    assert.deepEqual(Object.keys(aggregator.aggregate()), []);
+    const markdown = aggregator.formatAsMarkdown();
+    assert.ok(markdown.startsWith('No failures to report\n'));
+    assert.ok(markdown.includes('Health summary\n'));
+    assert.equal(markdown.includes('Failed PR'), false);
+    aggregator.display();
+    assert.deepEqual(cli._calls.table, []);
+  });
+
   it('preserves branches across runs without changing PR counts or CI ordering', () => {
     const cli = new TestCLI();
     const failures = [
diff --git a/test/unit/ci_list_builds.test.js b/test/unit/ci_list_builds.test.js
new file mode 100644
index 00000000..e52593d1
--- /dev/null
+++ b/test/unit/ci_list_builds.test.js
@@ -0,0 +1,96 @@
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+
+import { listBuilds } from '../../lib/ci/ci_utils.js';
+import { CI_TYPES, CI_TYPES_KEYS } from '../../lib/ci/ci_type_parser.js';
+import TestCLI from '../fixtures/test_cli.js';
+
+const { PR, COMMIT } = CI_TYPES_KEYS;
+const results = ['SUCCESS', 'FAILURE', 'ABORTED', 'UNSTABLE', null];
+
+function build(type, jobid, result, owner, timestamp = 200) {
+  const { jobName } = CI_TYPES.get(type);
+  return {
+    url: `https://ci.nodejs.org/job/${jobName}/${jobid}/`,
+    result,
+    timestamp,
+    ...(owner === undefined
+      ? {}
+      : {
+          actions: [{}, {
+            parameters: [{
+              name: type === PR ? 'TARGET_GITHUB_ORG' : 'GITHUB_ORG',
+              value: owner
+            }]
+          }]
+        })
+  };
+}
+
+function requestFor(builds) {
+  return {
+    async json(url) {
+      assert.equal(new URL(url).searchParams.get('tree'),
+        'builds[url,result,timestamp,actions[parameters[name,value]]]');
+      return { builds };
+    }
+  };
+}
+
+function jobids(builds) {
+  return Object.fromEntries(Object.entries(builds).map(([key, value]) =>
+    [key, key === 'count' ? value : value.map(build => build.jobid)]));
+}
+
+describe('Reliability build listings', () => {
+  for (const type of [PR, COMMIT]) {
+    it(`excludes private ${type} builds from every result and the total`, async() => {
+      const builds = results.flatMap((result, index) => [
+        build(type, index + 1, result, 'nodejs'),
+        build(type, index + 101, result, index % 2 ? 'NODEJS-PRIVATE' : 'nodejs-private')
+      ]);
+      builds.push(
+        build(type, 6, 'FAILURE', 'panva'),
+        build(type, 7, 'FAILURE', 'nodejs-private-extra'),
+        build(type, 8, 'FAILURE'),
+        { ...build(type, 9, 'FAILURE'), actions: [{}] },
+        {
+          ...build(type, 10, 'FAILURE'), actions: [{
+            parameters: [
+              { name: 'BRANCH', value: 'nodejs-private' }
+            ]
+          }]
+        }
+      );
+
+      assert.deepEqual(jobids(await listBuilds(new TestCLI(), requestFor(builds), type)), {
+        success: [1],
+        failed: [2, 6, 7, 8, 9, 10],
+        aborted: [3],
+        pending: [5],
+        unstable: [4],
+        count: 10
+      });
+    });
+
+    it(`retains the since cutoff while excluding private ${type} builds`, async() => {
+      const builds = [
+        build(type, 1, 'FAILURE', 'nodejs', 100),
+        build(type, 2, 'FAILURE', 'nodejs', 150),
+        build(type, 3, 'FAILURE', 'nodejs', 200),
+        build(type, 4, 'FAILURE', 'nodejs-private', 300)
+      ];
+      const filtered = await listBuilds(new TestCLI(), requestFor(builds), type, new Date(150));
+      assert.deepEqual(filtered.failed.map(build => build.jobid), [3]);
+      assert.equal(filtered.count, 1);
+    });
+
+    it(`returns empty result buckets when all ${type} builds are private`, async() => {
+      const builds = results.map((result, index) =>
+        build(type, index + 1, result, 'nodejs-private'));
+      assert.deepEqual(jobids(await listBuilds(new TestCLI(), requestFor(builds), type)), {
+        success: [], failed: [], aborted: [], pending: [], unstable: [], count: 0
+      });
+    });
+  }
+});