How much funding has Bun raised?

Bun has raised $7.0M in total funding, most recently a Seed round.

Who are Bun's investors?

Bun's investors include Anthropic, Kleiner Perkins, Y Combinator Continuity Fund.

Where is Bun headquartered?

Bun is headquartered in San Francisco, California, United States.

What industry is Bun in?

Bun operates in Developer Tools, JavaScript, Open Source Software.

Bun

Acquired

A fast all-in-one JavaScript runtime

San Francisco, United States · Founded 2019 · $7.0M raised

Developer Tools

JavaScript

Open Source Software

Headquarters: San Francisco, California
Employees: 11–50
Founded: 2019
Business Model: b2d

Website: bun.sh
Total Funding: $7.0M
Last Round: $7.0M SeedAug 2022
Rounds: 1

About

Founded in 2019 by Jarred Sumner in San Francisco, Bun is a fast, incrementally adoptable all-in-one JavaScript, TypeScript, and JSX toolkit. Built on top of JavaScriptCore (Safari's JS engine), Bun starts 3x faster than Node.js and provides an integrated package manager (up to 30x faster than npm), test runner (Jest-compatible), and bundler. It aims for 100% Node.js compatibility and includes built-in APIs for HTTP servers, WebSockets, PostgreSQL/MySQL/SQLite, Redis, S3, file I/O, and more. Bun was incubated through Y Combinator and had 13 employees as of its YC profile. In 2025, Bun joined Anthropic.

Summary

Bun is a Developer Tools company based in San Francisco, United States, founded in 2019. It has raised $7.0M in total across 1 round, most recently a $7.0M Seed round in Aug 2022. Investors include Anthropic, Kleiner Perkins and Y Combinator Continuity Fund.

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