Funded Artificial Intelligence Startups in San Francisco
The 50 most recent rounds span from late August through late November 2025, covering every stage from pre-seed through Series E.
The 50 most recent rounds span from late August through late November 2025, covering every stage from pre-seed through Series E. Two rounds dominate the top of the stack: Anysphere closed a $2.3B Series D on November 14 and Lambda raised $1.5B in a Series E four days later. Series B activity was dense across the period, with Alembic ($145M), Distyl AI ($175M), Eve ($103M), and Reducto ($75M) all clearing substantial thresholds between September and November.
At the early end, a cluster of pre-seed rounds — most fixed at exactly $500K — closed within a five-day window in early September 2025, consistent with a cohort or accelerator event. Seed rounds ranged from $2M (Cuckoo) to $9M (Central). The data reflects a segment where capital is being committed at both extremes simultaneously: billion-dollar late-stage infrastructure bets and sub-million company formations closing just weeks apart, all within San Francisco.
Most recent rounds
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Frequently asked
What are the largest disclosed rounds among San Francisco AI startups in this dataset?
The five largest are Anysphere ($2.3B Series D, November 14), Lambda ($1.5B Series E, November 18), Mercor ($350M Series C, October 30), Perplexity AI ($200M undisclosed venture round, September 12), and Distyl AI ($175M Series B, September 22). Alembic ($145M Series B) and EvenUp ($150M Series E) also crossed nine figures.
Which funding stage has the most companies in this data?
Series B and pre-seed each account for 10 of the 50 companies. Series B round sizes ranged from $40M (Tavus) to $175M (Distyl AI), while pre-seed rounds were mostly fixed at $500K, with the bulk closing in a narrow window between September 9 and 13, 2025.
How much of this activity is concentrated in recent months?
The 50 rows span August 21 to November 27, 2025 — roughly three months. October and November together account for about half the rows, and November alone includes the two largest raises: Anysphere's $2.3B Series D and Lambda's $1.5B Series E, both closing within a four-day span.
Are there late-stage companies in the dataset worth flagging for enterprise outreach?
Four companies raised at Series D or E: Lambda ($1.5B), Anysphere ($2.3B), EvenUp ($150M), and Supabase ($100M). Mercor's $350M Series C and Starship Technologies' $50M Series C round out the later-stage cohort — six companies total above Series B.
How many companies raised undisclosed amounts, and what stages are they?
Five companies — Voxel, Twelve Labs, WeaveGrid, Groflex, and Numerai — have undisclosed round sizes. Their stage labels span Seed (Groflex), Series Unknown (Numerai), and Venture - Series Unknown (Voxel, Twelve Labs, WeaveGrid).
What does the earliest-stage funding activity look like in this segment?
Twelve companies raised seed rounds ranging from $2M (Cuckoo) to $9M (Central), with Myriad AI ($8M) and alphaXiv ($7M) also near the top. Ten pre-seed rounds closed at $500K each, with seven of them recorded between September 9 and 13, 2025 — a density that suggests a cohort or accelerator-linked event.
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