fundraise receipt · climate
frontrun flagged Mariana Minerals Co 139 days before its $310M Series B round
tl;dr: Mariana Minerals Co announced $310M Series B on Aug 3, 2026, led by Khosla Ventures. frontrun flagged the company on Mar 17, 2026, 139 days before the announcement.
what Mariana Minerals Co raised
Mariana Minerals Co (@marianaminerals · marianaminerals.com) announced $310M Series B on Aug 3, 2026, led by Khosla Ventures, with participation from Andreessen Horowitz (a16z), Breakthrough Energy Ventures, Greenoaks, Halo Fund, Pax Ventures, StepStone Group, BHP Ventures, Washington Harbour Partners, Greycroft, General Innovation Capital Partners, Mitsubishi Corporation, In-Q-Tel (IQT), Earthshot Ventures, Andreessen Horowitz, @a16z, @Breakthrough. verified against marianaminerals.com.
Building a better minerals company.
how we knew 139 days early
frontrun watches the follow graphs of 2,000+ tracked venture investors on X. on Mar 17, 2026, tracked investors began following Mariana Minerals Co. that convergence was logged that day. the round landed 139 days later.
24 tracked investors follow Mariana Minerals Co today, and the account has grown to 1,495 followers. that count is public. which investors they are, and the day each one followed, is what the product shows.
Mariana Minerals Co 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
Gumroad $1.2M (140d early) · Project Eleven $300M (132d early) · Andon Labs $500K (147d early) · kash $2M (149d early) · MNX $6.4M (153d early)
data updated Aug 6, 2026 · Mariana Minerals Co signal page · every round we called early · trending this week