Venture - Series Unknown Funded Artificial Intelligence Startups
The 50 most recent venture rounds with undisclosed series designations in artificial intelligence span a range that makes stage-agnostic sourcing challengi…
The 50 most recent venture rounds with undisclosed series designations in artificial intelligence span a range that makes stage-agnostic sourcing challenging: Kalshi closed a $1.0B round in New York on 2025-11-22, while Bot Image in Omaha raised $200K on 2025-10-15. Between those poles sit robotics company Apptronik ($331M, Austin), video generation platform Synthesia ($200M, London), and Perplexity AI ($200M, San Francisco). The "Series Unknown" label reflects that the series stage was not disclosed in the underlying filings, not that the companies are early-stage by default.
Geographically, California dominates — San Francisco, San Jose, Los Angeles, San Diego, Menlo Park, Burbank, and Santa Clara each contribute companies — with Austin, New York, and Boston rounding out the U.S. clusters. International activity is present: London, Amsterdam, Tel Aviv, Barcelona, and Singapore all appear in the dataset. Roughly a quarter of the 50 rows carry undisclosed amounts, including recognizable names such as Zest AI, Twelve Labs, and Salience Labs.
Most recent rounds
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Frequently asked
What are the largest disclosed rounds in this segment?
Kalshi leads at $1.0B (New York, 2025-11-22), followed by Apptronik at $331M (Austin, 2025-11-28) and NestAI at $115M (2025-11-20). Synthesia and Perplexity AI each closed $200M rounds in October and September 2025, and Iambic Therapeutics raised $100M on 2025-11-11. Six companies in the set exceeded $100M in disclosed funding.
How many rounds in this segment have undisclosed amounts?
13 of the 50 rows list undisclosed amounts — roughly 26% of the dataset shown. That group includes Zest AI, Twelve Labs, WeaveGrid, Salience Labs, Voxel, and Augmentus, making dollar-amount filtering alone an incomplete sourcing strategy for this segment.
Which U.S. cities appear most frequently among these AI companies?
San Francisco leads with four companies (Voxel, Twelve Labs, WeaveGrid, Perplexity AI), followed by New York and Boston with three each, and Austin with two (Verisoul, Apptronik). California as a whole accounts for the largest share of U.S.-based companies, with entries spread across San Francisco, Los Angeles, San Diego, San Jose, Menlo Park, Burbank, Santa Clara, and Yorba Linda.
How many of these companies are headquartered outside the United States?
At least 12 of the 50 companies are international. London contributes three (Synthesia, Captur, Causaly), Israel three (Prisma Photonics, AiDock, Exodigo), and Amsterdam two (Healthplus.ai, Clear). France (TiHive Technologies, Grenoble), Spain (Aily Labs, Barcelona), Singapore (Augmentus), and Oxford (Salience Labs) each appear once.
What application verticals are covered within this AI funding segment?
The dataset spans drug discovery (Iambic Therapeutics, Arzeda), humanoid robotics (Apptronik), video generation (Synthesia, Twelve Labs), cybersecurity (SOC Prime), credit and fintech (Zest AI, PredictAP), energy grid management (WeaveGrid), prediction markets (Kalshi), and materials sorting (Sortera Alloys). The breadth means vertical filtering by company description is more precise than the AI sector tag alone for targeted prospecting.
How wide is the round size range across the disclosed amounts in this segment?
Disclosed amounts range from $100K (Captur, London) to $1.0B (Kalshi, New York), a spread of four orders of magnitude. The majority of disclosed rounds fall below $50M, with only six companies — Kalshi, Apptronik, Synthesia, Perplexity AI, NestAI, and Iambic Therapeutics — clearing the $100M threshold.
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