Bun Acquired by Anthropic in 2025, Bun develops an open-source JavaScript and TypeScript runtime with built-in bundling, transpilation, task-running, and npm-compatible package management.

Products & media

Bun Runtime

Runs JavaScript and TypeScript with Node.js compatibility and built-in APIs for servers, databases, files, and network requests.

Bun Test Runner

Runs JavaScript and TypeScript tests with Jest-compatible assertions, mocks, snapshots, coverage, and fast startup.

bun install

Installs npm packages using a global cache, with workspaces, lockfiles, and dependency management that also work in existing Node.js projects.

Bun Bundler

Bundles JavaScript, TypeScript, JSX, CSS, and HTML for browsers or servers, with development hot reloading and standalone executables.

Team

2 people across company lists

Founders

1 person

List
Jarred Sumner2021

Previous Affiliates

1 person

List
Eugene2024-09

Jobs

See all jobs for Bun here.

Funding

All fundraising announcements are based on public sources. Please contact Cosign if you believe there are any discrepancies, or claim the profile to edit.

Data current as of December 2, 2025

Leads

Participating Firms

Angels