Funded Startups in Belmont
Belmont appears across two distinct startup clusters — Belmont, California and Belmont, Massachusetts — with recent funding activity spanning biotechnology…
Belmont appears across two distinct startup clusters — Belmont, California and Belmont, Massachusetts — with recent funding activity spanning biotechnology, consumer electronics, AI, and blockchain. Among the seven most recent rounds on record, biotechnology is the most represented sector: Solve Therapeutics closed a $120M venture round in November 2025, 4D Path raised $13M in May 2023, and BioROSA Technologies completed a venture round in late 2021, all affiliated with the Massachusetts cluster.
The largest single disclosed round in this set belongs to Cellink (Belmont, CA), which raised $250M in a Series D in February 2022. Consumer electronics and AI also appear, with Avegant pulling in $15M in May 2025 and Themis AI completing an undisclosed round in May 2023. Several companies — Circular Labs, Themis AI, and BioROSA Technologies — did not disclose round sizes, which limits direct capital comparison. Five of the seven rounds carry a "Series Unknown" classification, reflecting the incomplete stage data common in early and mid-stage venture reporting.
Most recent rounds
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Frequently asked
What are the largest disclosed rounds among Belmont-based startups in this data?
Cellink leads at $250M (Series D, Belmont CA, February 2022), followed by Solve Therapeutics at $120M (venture round, November 2025) and Avegant at $15M (May 2025). 4D Path disclosed $13M in May 2023. Circular Labs, Themis AI, and BioROSA Technologies did not disclose amounts, so those three rounds cannot be ranked by capital raised.
Which sectors appear most often in recent Belmont funding rounds?
Biotechnology accounts for three of the seven companies shown — Solve Therapeutics, 4D Path, and BioROSA Technologies. Consumer electronics follows with two (Avegant and Cellink), while AI and blockchain each have one entry: Themis AI and Circular Labs, respectively.
Are these Belmont startups in California or Massachusetts?
The data splits between the two. Avegant, Themis AI, and Cellink are in Belmont, California; Circular Labs, 4D Path, and BioROSA Technologies are in Belmont, Massachusetts. Solve Therapeutics is listed only as Belmont, United States without a state.
What funding stages are represented here?
Five of seven rounds are classified as 'Series Unknown' or 'Venture — Series Unknown,' making precise stage mapping difficult. Cellink's Series D ($250M) is the only clearly labeled late-stage round; Circular Labs' Pre-Seed (August 2024) is the only clearly labeled early-stage round.
How recent is the funding activity in this dataset?
The most recent round is Solve Therapeutics in November 2025, followed by Avegant in May 2025 and Circular Labs in August 2024. The oldest entry is BioROSA Technologies from November 2021, placing the full window at roughly four years.
Is there AI or deep-tech activity among Belmont-funded companies?
Themis AI (Belmont, CA) raised an undisclosed Series Unknown round in May 2023, and Circular Labs (Belmont, MA) closed a pre-seed in blockchain and cryptocurrency in August 2024. Both rounds have undisclosed amounts, so capital scale for these verticals is not determinable from this data.
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