fundraise receipt · energy
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, when it had 1,495 followers, 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.
Mariana Minerals builds and operates autonomous mines and refineries, with a focus on supplying minerals critical to modern energy, AI, and defense technologies
how we knew 139 days early
frontrun watches the follow graphs of 5,000+ tracked accounts on X. on Mar 17, 2026, tracked investors began following Mariana Minerals Co, which had 1,495 followers at the time. that convergence was logged that day. the round landed 139 days later.
48 tracked investors follow Mariana Minerals Co today, and the account has grown to 2,763 followers. that count is public. which investors they are, and the day each one followed, is what the product shows.
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other rounds we called early
StableStock $1.9B (139d early) · microagi $55M (141d early) · Spark $120M (136d early) · Flip $1.4M (142d early) · Kled AI $10M (142d early)
data updated Nov 9, 2026 · Mariana Minerals Co signal page · every round we called early · trending this week