Funded Artificial Intelligence Startups in San Mateo
San Mateo's AI startup funding activity spans late 2020 through November 2025 in this 33-company set, with six rounds closing in 2025 alone.
San Mateo's AI startup funding activity spans late 2020 through November 2025 in this 33-company set, with six rounds closing in 2025 alone. The largest 2025 raise was Hammerspace's $100M Series B in April — a data infrastructure company targeting AI workloads — followed by Feedzai's $75M Series E in October and Wisdom AI's $50M Series A in November. Early-stage closings in 2025 include Aurasell's $30M Seed and Refold's $7M Seed in August, plus PatternFast's $500K Seed in May.
Application areas across the dataset range from contract intelligence (Evisort's $100M Series C, 2022) and fraud detection (Feedzai) to healthcare AI (Mendaera's $73M Series B, Notable's $100M Series B) and graph databases (Neo4j's $66M Series F, 2021). Three companies in the set reached or exceeded $100M in a single round: Hammerspace, Evisort, and Notable. Seed rounds vary widely — from $500K (PatternFast) to $30M (Aurasell) — indicating different conviction levels across early-stage deals in the city.
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Frequently asked
What are the largest single rounds among San Mateo AI startups in this data?
Three companies raised $100M or more: Hammerspace (Series B, April 2025), Evisort (Series C, May 2022), and Notable (Series B, November 2021). The next-largest closes are yellow.ai ($78M Series C, August 2021), BigHat Biosciences ($75M Series B, July 2022), Feedzai ($75M Series E, October 2025), and Mendaera ($73M Series B, September 2024).
How many rounds closed in 2025, and which companies led by size?
Six rounds are recorded in 2025 through November. Hammerspace's $100M Series B in April is the largest, followed by Feedzai's $75M Series E in October and Wisdom AI's $50M Series A in November. Early-stage closes include Aurasell's $30M Seed and Refold's $7M Seed in August, plus PatternFast's $500K Seed in May.
Which funding stage appears most often among these San Mateo AI companies?
Seed is the most frequent stage, appearing eight times in the 33-company set. Series A follows with seven rounds and Series B with six. Series C through F account for six rounds combined, with the remainder split across Pre-Seed, Grant, and unlabeled closes.
What's the size range for seed-stage AI raises in San Mateo shown here?
Seed rounds run from $500K (PatternFast, May 2025) to $30M (Aurasell, August 2025), with six of the eight seed closes falling between $4M and $7M — Sonical ($4M), Cornerstone AI ($5M), Revvo ($6M), EARTH AI ($6M), DataJoy ($6M), and Refold ($7M). Pre-Seed closes include PLATMA at $2M (September 2024) and an undisclosed round from Vouchery.io (August 2023).
Which AI application verticals show up most in the San Mateo dataset?
Healthcare AI has a clear cluster: Mendaera ($73M Series B, 2024), Notable ($100M Series B, 2021), and Lumiata ($14M Series B, 2021) all raised Series B rounds. Data infrastructure and MLOps are also represented — Hammerspace ($100M Series B) addresses global data management for AI workloads, and VESSL AI ($12M Series A) targets ML operations.
Which companies in the dataset are at the most advanced funding stages?
Neo4j (Series F, $66M, November 2021) and Feedzai (Series E, $75M, October 2025) represent the highest round letters in the set. Four companies have reached Series C: Evisort ($100M, May 2022), yellow.ai ($78M, August 2021), Jupiter Intelligence ($54M, October 2021), and Superb AI ($10M, September 2024).
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