Bun
Last verified 2026-05-07. JSON
The funding figures on this page are attributed, not sourced: a publisher is on record but no document URL is. How we mark provenance.
| Total raised | $5.0Mattributed |
|---|---|
| Latest round | series-a, $5.0M, 2024-09-15attributed |
| Founded | 2018 |
| Headquarters | San Francisco |
| Industry | b2b |
| Stage | series-a |
| Website | bun.sh |
Bun is a JavaScript and TypeScript runtime plus toolkit that bundles a fast runtime with a package manager, test runner, and bundler, with native TypeScript and JSX execution. It targets developers building backend services, full-stack apps, CLIs, and tooling who want shorter builds and faster startup. The package manager runs roughly 30x faster than npm and the runtime starts about 3x faster than Node.js with built-in PostgreSQL, Redis, S3, and WebSocket APIs.
Funding rounds
| Date | Round | Amount | Lead |
|---|---|---|---|
| 2024-09-15 | series-a | $5.0M | yc |
Detected tech stack
Cloudflare, Vercel, Algolia, Google Analytics, Google Tag Manager, jsDelivr, DoubleClick Floodlight, WordPress, PHP, MySQL, React
Provenance
| Fact | Status | Basis |
|---|---|---|
| Series A, $5.0M | attributed | yc named as publisher. No document URL on file. |
| Total raised $5.0M | attributed | yc named as publisher. No document URL on file. |
| Company existence | sourced | Y Combinator named as publisher. Document, retrieved 2026-09-17. |
| Description | self-reported | bun.sh, read 2026-05-07 |
Change history
| Date | Fact | Change | Basis |
|---|---|---|---|
| 2026-09-24Existence: self-reported → sourced, Y Combinator, document, retrieved 2026-09-17 | Existence | self-reported → sourced | Y Combinator, document, retrieved 2026-09-17 |
Records begin 2026-09-24. All changes