Series B Funded Startups in United States
Series B rounds in the United States (50 most recent entries) show a wide disclosed range, but the top end is dominated by one outlier: Kailera Therapeutic…
Series B rounds in the United States (50 most recent entries) show a wide disclosed range, but the top end is dominated by one outlier: Kailera Therapeutics raised $600M on 2025-10-19, far above the next-largest disclosed amounts (Function Health at $298M on 2025-11-18 and Genspark at $200M on 2025-11-15). Most other disclosed rounds cluster well below this peak, with many in the $20M–$100M band (for example, Sunflower Labs at $16M on 2025-11-05 and several $40M–$55M rounds in mid-November).
The geography and timing also cluster. San Francisco appears repeatedly as a headquarters city (Gridware on 2025-11-23 at $55M; Numeric on 2025-11-22 at $51M; Gamma on 2025-11-16 at $48M; Alembic on 2025-11-12 at $145M; and more), while the disclosed “lowest” is $16M from Sunflower Labs on 2025-11-05. Dates span from 2025-10-16 to 2025-11-23 in the rows shown, with most activity concentrated in November. Sector-wise, Artificial Intelligence (AI) appears in 3+ entries (e.g., Numeric 2025-11-22 $51M; Gamma 2025-11-16 $48M; Alembic 2025-11-12 $145M), and disclosures are missing for multiple rounds: 4 entries are “undisclosed” (KERV Interactive 2025-11-20; Imbria Pharmaceuticals 2025-11-19; Creekstone Energy 2025-11-03; KOR Financial 2025-10-16).
Most recent rounds
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Frequently asked
What’s the largest disclosed Series B in this US list, and how does it compare to the rest of the disclosed rounds?
Kailera Therapeutics’ $600M round on 2025-10-19 is the clear outlier; it dwarfs the next-largest disclosed entries, including Function Health’s $298M (2025-11-18) and Genspark’s $200M (2025-11-15). Outside the top end, many disclosed rounds fall into the $20M–$100M range (for example, Sunflower Labs at $16M on 2025-11-05 and Agentio at $40M on 2025-11-18).
Are there noticeable city or geography concentrations in these recent Series B rounds?
San Francisco shows up frequently across dates (Gridware on 2025-11-23 at $55M; Numeric on 2025-11-22 at $51M; Gamma on 2025-11-16 at $48M; Alembic on 2025-11-12 at $145M), suggesting repeated hub clustering versus single-city one-offs. Other cities appear less repeatedly (e.g., Boston: Beacon Biosignals $86M on 2025-11-15 and Peptilogics $78M on 2025-10-16).
How tight is the timing of these 50 rounds, and where do the edges land?
Within the rows shown, round dates span from 2025-10-16 to 2025-11-23, with the most recent entry being Gridware on 2025-11-23 ($55M). The mid-to-late portion of the window carries the densest pattern (multiple entries dated 2025-11-16 through 2025-11-18, such as Function Health $298M on 2025-11-18 and Celero Communications $100M on 2025-11-18).
Which sectors look over-represented, based on repeated appearances in this list?
Artificial Intelligence (AI) appears in 3+ entries across different cities and amounts (Numeric $51M on 2025-11-22; Gamma $48M on 2025-11-16; Beacon Biosignals $86M on 2025-11-15; Alembic $145M on 2025-11-12). That reuse of AI across multiple companies suggests it’s a recurring theme rather than a one-off tagging variation.
Are there any disclosure outliers due to missing amounts (“undisclosed”)?
Four rounds are “undisclosed” in the rows shown, which can affect comparisons against disclosed sizes: KERV Interactive (2025-11-20), Imbria Pharmaceuticals (2025-11-19), Creekstone Energy (2025-11-03), and KOR Financial (2025-10-16). In contrast, the smallest disclosed amount is $16M from Sunflower Labs on 2025-11-05, allowing a cleaner low-end benchmark among disclosed entries.
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