diff --git a/package.json b/package.json
index fbe47ec8b4..ac1ad79abe 100644
--- a/package.json
+++ b/package.json
@@ -92,6 +92,7 @@
     "prettier": "^2.2.1",
     "semver": "^7.5.3",
     "shx": "^0.3.2",
+    "sloc": "^0.3.1",
     "ts-node": "^10.4.0",
     "typescript": "~5.1.0"
   },
diff --git a/scripts/list-ownership.js b/scripts/list-ownership.js
new file mode 100755
index 0000000000..7f338ceed4
--- /dev/null
+++ b/scripts/list-ownership.js
@@ -0,0 +1,139 @@
+#!/usr/bin/env node
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const fs = require('fs-extra');
+const globby = require('globby');
+const sloc = require('sloc');
+const codeownersUtils = require('codeowners-utils');
+const { resolve: resolvePath } = require('path');
+
+async function loadOwners(rootDir) {
+  const codeowners = await codeownersUtils.loadOwners(rootDir);
+
+  return function getOwners(path) {
+    const { owners } = codeownersUtils.matchFile(path, codeowners);
+    if (
+      owners.includes('@backstage/maintainers') &&
+      owners.includes('@backstage/reviewers')
+    ) {
+      return owners.filter(owner => owner !== '@backstage/reviewers');
+    }
+    return owners;
+  };
+}
+
+function createLocCounter(rootDir) {
+  return async path => {
+    const content = await fs.readFile(resolvePath(rootDir, path), 'utf-8');
+    const stats = sloc(content, 'ts');
+    return stats.source;
+  };
+}
+
+async function printOwnerDirectories(allFiles, getOwners, getLoc, onlyOwner) {
+  const countByPath = new Map();
+
+  let total = 0;
+  let totalShare = 0;
+  for (const file of allFiles) {
+    const owners = getOwners(file);
+    const loc = await getLoc(file);
+
+    if (owners.includes(onlyOwner)) {
+      const share = loc / owners.length;
+      total += loc;
+      totalShare += share;
+
+      const path = file.split('/').slice(0, 2).join('/');
+      if ((await fs.stat(path)).isDirectory()) {
+        countByPath.set(path, (countByPath.get(path) || 0) + share);
+      }
+    }
+  }
+
+  const sortedPaths = Array.from(countByPath)
+    .map(([path, loc]) => ({ path, loc: Math.round(loc) }))
+    .sort((a, b) => b.loc - a.loc);
+
+  const maxPathLen = Math.max(...sortedPaths.map(({ path }) => path.length));
+  for (const { path, loc } of sortedPaths) {
+    console.log(`${path.padEnd(maxPathLen)} ${loc}`);
+  }
+  console.log();
+  console.log('Total share:', Math.round(totalShare));
+  console.log('Total lines of code:', total);
+}
+
+async function printAllOwners(allFiles, getOwners, getLoc) {
+  const countByOwners = new Map();
+
+  let total = 0;
+  for (const file of allFiles) {
+    const owners = getOwners(file);
+    const loc = await getLoc(file);
+
+    total += loc;
+    const share = loc / owners.length;
+    for (const owner of owners) {
+      countByOwners.set(owner, (countByOwners.get(owner) || 0) + share);
+    }
+  }
+
+  const sortedOwners = Array.from(countByOwners)
+    .map(([owner, loc]) => ({ owner, loc: Math.round(loc) }))
+    .sort((a, b) => b.loc - a.loc);
+
+  const maxOwnerLen = Math.max(
+    ...sortedOwners.map(({ owner }) => owner.length),
+  );
+  for (const { owner, loc } of sortedOwners) {
+    console.log(`${owner.padEnd(maxOwnerLen)} ${loc}`);
+  }
+  console.log();
+  console.log('Total lines of code:', total);
+}
+
+async function main(onlyOwner) {
+  const rootDir = resolvePath(__dirname, '..');
+
+  const allFiles = await globby(
+    [
+      '**/*.{js,jsx,ts,tsx,mjs,cjs}',
+      '!**/*.{generated,test}.*',
+      '!**/{__fixtures__,fixtures}',
+    ],
+    {
+      cwd: rootDir,
+      gitignore: true,
+      followSymbolicLinks: false,
+    },
+  );
+
+  const getOwners = await loadOwners(rootDir);
+  const getLoc = createLocCounter(rootDir);
+
+  if (onlyOwner) {
+    await printOwnerDirectories(allFiles, getOwners, getLoc, onlyOwner);
+  } else {
+    await printAllOwners(allFiles, getOwners, getLoc);
+  }
+}
+
+main(...process.argv.slice(2)).catch(err => {
+  console.error(err.stack);
+  process.exit(1);
+});
diff --git a/yarn.lock b/yarn.lock
index 2220b18fef..33d6c2602f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -22833,12 +22833,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cli-table@npm:^0.3.1":
-  version: 0.3.6
-  resolution: "cli-table@npm:0.3.6"
+"cli-table@npm:^0.3.1, cli-table@npm:^0.3.11":
+  version: 0.3.11
+  resolution: "cli-table@npm:0.3.11"
   dependencies:
     colors: 1.0.3
-  checksum: b0cd08578c810240920438cc2b3ffb4b4f5106b29f3362707f1d8cfc0c0440ad2afb70b96e30ce37f72f0ffe1e844ae7341dde4df17d51ad345eb186a5903af2
+  checksum: 59fb61f992ac9bc8610ed98c72bf7f5d396c5afb42926b6747b46b0f8bb98a0dfa097998e77542ac334c1eb7c18dbf4f104d5783493273c5ec4c34084aa7c663
   languageName: node
   linkType: hard
 
@@ -39499,7 +39499,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"readdirp@npm:~3.6.0":
+"readdirp@npm:^3.3.0, readdirp@npm:~3.6.0":
   version: 3.6.0
   resolution: "readdirp@npm:3.6.0"
   dependencies:
@@ -40423,6 +40423,7 @@ __metadata:
     prettier: ^2.2.1
     semver: ^7.5.3
     shx: ^0.3.2
+    sloc: ^0.3.1
     ts-node: ^10.4.0
     typescript: ~5.1.0
   languageName: unknown
@@ -41206,6 +41207,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"sloc@npm:^0.3.1":
+  version: 0.3.1
+  resolution: "sloc@npm:0.3.1"
+  dependencies:
+    async: ^3.2.4
+    cli-table: ^0.3.11
+    commander: ^11.0.0
+    readdirp: ^3.3.0
+  bin:
+    sloc: bin/sloc
+  checksum: 3075150912b4fbb90167c446b155fcfffa20351245d7ae2a7139b2c3ba5dd9fd01fe97fc11a917d5f6a66778c3a9ab4c6ceff0bcd234338f38942fb7238ab927
+  languageName: node
+  linkType: hard
+
 "slugify@npm:^1.6.4":
   version: 1.6.6
   resolution: "slugify@npm:1.6.6"