Key facts
- Promptfoo’s last known valuation is $85.5M (Jul 2025).
- It has raised $22.7M across 2 recorded rounds; the latest was Early Stage VC ($17.5M) in Jul 2025.
- Notable investors include Andreessen Horowitz, Insight Partners (New York), Uncorrelated Ventures, 515 Ventures, Tobi Lütke — 8 tracked in total.
- Promptfoo has filed 2 Form Ds with the SEC since 2024, most recently Jul 2025 ($17.5M sold to 3 investors).
- Status: Privately Held (backing).
- ·Post-money valuations for all 2 rounds
- ·The complete investor list — 8 names
- ·Watchlist + deal alerts for Promptfoo
Funding rounds
2 roundsAbout Promptfoo
Operator of an open-source large language model testing company intended to discover and eliminate major large language model risks. The company provides an open-source testing platform that custom probes for applications that identify failures and uncover potential failure modes using generating attacks and jailbreaks customized to the application, enabling developers to move quickly with a command-line interface, live reloads, and caching without software development kits, cloud dependencies, or logins.
- Sector
- Information Technology
- HQ
- San Francisco, CA, United States
- Founded
- 2024
- Employees
- 11
- Website
- promptfoo.dev/
- Ownership
- Privately Held (backing)
Promptfoo doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Promptfoo shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Promptfoo in its N-PORT filings yet. We sweep new filings monthly.