fundraise receipt · ai
frontrun flagged Guardrails AI (acq. by Harvey) 39 days before its $550M round
tl;dr: Guardrails AI (acq. by Harvey) announced $550M on Sep 9, 2026, led by Lightspeed and Diffusion and Guardrails AI. frontrun flagged the company on Aug 1, 2026, 39 days before the announcement.
what Guardrails AI (acq. by Harvey) raised
Guardrails AI (acq. by Harvey) (@guardrails_ai · guardrailsai.com) announced $550M on Sep 9, 2026, led by Lightspeed and Diffusion and Guardrails AI. verified against thenextweb.com.
Building the guardrails around large language models. Discord: https://t.co/PkSO3mMUvH
how we knew 39 days early
frontrun watches the follow graphs of 2,000+ tracked venture investors on X. on Aug 1, 2026, tracked investors began following Guardrails AI (acq. by Harvey). that convergence was logged that day. the round landed 39 days later.
3 tracked investors follow Guardrails AI (acq. by Harvey) today, and the account has grown to 3,105 followers. that count is public. which investors they are, and the day each one followed, is what the product shows.
Guardrails AI (acq. by Harvey) already raised. see the companies getting the same investor convergence right now, before their round. start a 7-day free trial →
other rounds we called early
blueprint.io $1.4M (39d early) · Starcap $65M (40d early) · Furientis $5M (40d early) · Antora Energy $550M (36d early) · Vorflux $15M (36d early)
data updated Oct 19, 2026 · Guardrails AI (acq. by Harvey) signal page · every round we called early · trending this week