Y Combinator

Accelerator
Mountain View, California, USAFounded 2005www.ycombinator.comSee connections →Compare with SV Angel

Pre-seed accelerator backing early-stage companies across AI, enterprise, consumer, fintech, healthcare, and SaaS with $500K initial investment.

Ranked on: #69 Most Active Series B Investors of 2026 (Ranked) · #80 Most Active Series A Investors of 2026 (Ranked) · #88 Top VC Firms in the Bay Area 2026 (Ranked by Deals) · Get your badge →

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At a glance

Y Combinator appears in 27 funding rounds tracked by ValueAddVC since 2018. Its most frequent sectors in these rounds are AI & Infrastructure and Developer Tools, and its most recent tracked deal was Ultra Robotics' $50M Series A round (Oct 9, 2026). It co-invests most often with Andreessen Horowitz, Benchmark and 8VC.

Strategy

Stages
Pre-SeedSeed
Sectors
AIEnterpriseConsumerFintechHealthcareSaaS
Geographies
USAMountain View, California, USA
Check size
$500K

Open Roles

10
See all →
Editorial ResearcherSan FranciscoAssociate Video ProducerSan FranciscoFront Desk ReceptionistSan Francisco Bay AreaExecutive AssistantSan FranciscoProduct Engineer, New ProductsSan Francisco Bay Area

Recent changes

  1. Oct 9, 2026Invested in Ultra Robotics (Series A, $50M) Fortune
  2. Oct 7, 2026Invested in Santé (Series A, $15M) Pulse 2.0
  3. Oct 6, 2026Invested in Vitalize (Series A, $31M) Pulse2.com
  4. Oct 6, 2026Invested in Flai (Series A, $27M) The SaaS News
  5. Oct 1, 2026Invested in Halluminate (Series A, $30M) Fortune
Earlier changes (15)
  1. Sep 30, 2026Invested in Jeeves (Bridge, $110M) Pulse 2.0
  2. Sep 23, 2026Invested in Numeral (Series C, $100M) Business Wire
  3. Sep 23, 2026Invested in Hubble Network (Series C, $200M) GeekWire
  4. Sep 22, 2026Invested in Firecrawl (Series B, $75M) SiliconANGLE
  5. Sep 22, 2026Invested in Confido (Series B, $55M) BusinessWire
  6. Sep 18, 2026Invested in Angle Health (Series C, $200M) TechCrunch
  7. Sep 8, 2026Invested in Stoke Space (Series E, $1B) TechCrunch
  8. Sep 5, 2026Stages updated: Pre-Seed, Seed ycombinator.com
  9. Sep 5, 2026Sectors updated: AI, Enterprise, Consumer, Fintech, Healthcare, SaaS ycombinator.com
  10. Sep 5, 2026Check size updated: $500K ycombinator.com
  11. Aug 20, 2026Invested in Apollo Atomics (Seed, $31M) Tech Startups
  12. Aug 19, 2026Sequoia, Khosla, Y Combinator Lead 2026's Unicorn Class Pulse story
  13. Aug 17, 2026Invested in River (Seed, $1.1B) TechCrunch
  14. Aug 12, 2026Invested in Blacksmith (Series B, $45M) PR Newswire
  15. Aug 6, 2026Invested in Naive (Series A, $28.5M) SiliconANGLE

Portfolio

29 total
Ultra RoboticsSantéFlaiVitalizeSupabaseHalluminateJeevesNumeralHubble NetworkConfidoFirecrawlAngle HealthStoke SpaceApollo AtomicsRiverBlacksmithNaiveHappyRobotCandid HealthNaturalEmergentOllamaBland AICorgiLegoraReplitBrexArray LabsRelativity Space

Recent Investment Activity

20

Track record: led 0 and participated in 27 of 27 tracked venture rounds · 25 in the last 12 months

DateCompanyEventRoleAmountValuationInvestorsSource
Oct 9, 2026Ultra RoboticsSeries AParticipated$50M—
Framework VenturesLeadunverifiedY CombinatorunverifiedNextView VenturesSiliconANGLE · unverifiedNext View
Fortune
Oct 7, 2026SantéSeries AParticipated$15M—
Bonfire VenturesunverifiedOperator CollectiveunverifiedY CombinatorunverifiedFINTOPVeridical Ventures
Pulse 2.0
Oct 6, 2026FlaiSeries AParticipated$27M—
Base10 PartnersLeadunverifiedToyota VenturesunverifiedFirst Round CapitalunverifiedY CombinatorunverifiedThe Friedkin GroupFindlay Automotive Group
The SaaS News
Oct 6, 2026VitalizeSeries AParticipated$31M—
Norwest Venture PartnersMedCity News · unverified.406 VenturesMedCity News · unverifiedY CombinatorMedCity News · unverifiedRock Health CapitalMedCity News · unverifiedOak HC/FT
Pulse story
Oct 1, 2026HalluminateSeries AParticipated$30M—
Y CombinatorunverifiedHeavybitunverifiedOak HC/FT
Fortune
Sep 30, 2026JeevesBridgeParticipated$110M—
CoinFundLeadunverifiedAndreessen HorowitzunverifiedCoinbase VenturesunverifiedCRVunverifiedGICunverifiedGlobal PayTech VenturesunverifiedParaFi CapitalunverifiedVista Equity PartnersunverifiedY CombinatorunverifiedAllianceBernsteinWintermute
Pulse story
Sep 23, 2026Hubble NetworkSeries CParticipated$200M$1.6B
Smith Point CapitalLeadSeraphim CapitalCarthona CapitalEarthshot VenturesY CombinatorRPM Ventures
GeekWire
Sep 23, 2026NumeralSeries CParticipated$100M—
Insight PartnersLeadunverifiedSalesforce VenturesunverifiedGeodesic CapitalunverifiedBenchmarkunverifiedMayfield FundunverifiedY CombinatorunverifiedUncork CapitalunverifiedFCVC
Business Wire
Sep 22, 2026ConfidoSeries BParticipated$55M—
Insight PartnersLeadAlleyWatchFootworkAlleyWatchY CombinatorAlleyWatchTrenches CapitalWatchfireBarrel Ventures
BusinessWire
Sep 22, 2026FirecrawlSeries BParticipated$75M—
Smash CapitalLeadAltos VenturesNexus VentureY CombinatorFreestyle CapitalOffline VenturesAlexandria
SiliconANGLE
Sep 18, 2026Angle HealthSeries CParticipated$200M$2.7B
Vitruvian PartnersLeadTown Hall VenturesBlumberg CapitalPortage PartnersPruven CapitalY Combinator
TechCrunch
Sep 8, 2026Stoke SpaceSeries EParticipated$1B$10B
Point72 VenturesLeadSpark CapitalLeadGeneral InnovationGlade Brook CapitalWashington Harbour PartnersWoven CapitalY CombinatorUS Innovation Technology
TechCrunch
Aug 20, 2026Apollo AtomicsSeedParticipated$31M—
Y CombinatorAlumni VenturesRobinhood VenturesNucleation CapitalPelion Venture PartnersDuke Capital PartnersFCVCTelesoft Partners
Pulse story
Aug 17, 2026RiverSeedParticipated$1.1B—
General CatalystLeadunverifiedNvidiaunverifiedAMD VenturesunverifiedY CombinatorunverifiedTemasekunverifiedAMP PBC
TechCrunch
Aug 12, 2026BlacksmithSeries BParticipated$45M$550M
Peak XV PartnersLeadGoogle Ventures (GV)Y Combinator
Pulse story
Aug 6, 2026NaiveSeries AParticipated$28.5M—
Nexus VentureLeadY CombinatorLiquid 2 VenturesZetta Venture Partners
Pulse story
Aug 4, 2026HappyRobotSeries CParticipated$150M$1.2B
Prysm CapitalLeadunverifiedEurazeoLeadunverifiedAndreessen HorowitzTech.eu · unverifiedBase10 PartnersTech.eu · unverifiedY CombinatorTech.eu · unverifiedKoch Disruptive TechnologiesTech.eu · unverifiedOrangeDeutsche Telekom T.Capital
Pulse story
Jul 22, 2026Candid HealthSeries DParticipated$120M—
Sixth StreetLeadunverified8VCunverifiedY CombinatorunverifiedOak HC/FT
Pulse story
Jul 20, 2026NaturalSeries AParticipated$30M—
Forerunner VenturesLeadunverifiedY Combinatorunverified
Natural
Jul 15, 2026EmergentSeries CParticipated$130M$1.5B
CreaegisLeadKhosla VenturesSoftBank Vision FundLightspeed Venture PartnersY CombinatorMNI Ventures-ClaypondSentinel Global
TechCrunch

Sector / Stage Activity

By sector (portfolio)
Developer tools
5 · 17%
Space
4 · 14%
AI infra
4 · 14%
Enterprise SaaS
3 · 10%
Insurtech
2 · 7%
Energy
1 · 3%
Healthtech
1 · 3%
AI
1 · 3%
Crypto
1 · 3%
Legal tech
1 · 3%
By stage (tracked rounds)
Series A
9 · 45%
Series C
7 · 35%
Series B
4 · 20%
Series E
2 · 10%
Seed
2 · 10%
Series D
2 · 10%
Bridge
1 · 5%

Co-Investors

12
SV Angel · 4 sharedAndreessen Horowitz · 3 sharedBase10 Partners · 3 sharedBenchmark · 3 sharedCoatue Management · 3 sharedGIC · 3 shared8VC · 2 sharedAccel · 2 sharedAbstract · 1 sharedFigure · 1 sharedFreestyle Capital · 1 sharedNextView Ventures · 1 shared

Similar Firms

overlapping sector, stage or region
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Value Add Research

Latest Pulse

  1. Blacksmith Hits $1 Billion Valuation, Up From $550M In AugustBlacksmith, the CI startup that buys its own servers instead of renting cloud capacity, raised a $66M Series C led by Sequoia at a $1B valuation -- up from $550M two months earlier, Fortune reported Oct. 21.→
  2. Bill Gross Launches Idealab.ai With 1.2M IdeasBill Gross, the Idealab founder behind more than 175 companies, launched a free AI platform making over 1.2 million business ideas searchable, with a stated goal of connecting founders to $100 million in potential funding.→
  3. Boomi Buys Data-Trust Startup Elementary Data For $40-45MBoomi acquired Israeli data-observability startup Elementary Data for an estimated $40-45 million in cash and stock, its third Israeli acquisition after Rivery and Lunar.dev, to monitor the data feeding enterprise AI agents.→
  4. Crunchbase Data Shows Investors Didn't Slow Down In Q3Crunchbase's investor-level breakdown of Q3 2026 shows most active investors increased deal counts even as total venture dollars fell, with Insight Partners, Andreessen Horowitz and Sequoia Capital all leading more rounds than the prior quarter.→
  5. Ultra Robotics Raises $62M, Pairs With Physical IntelligenceUltra Robotics has raised $62 million in total, including a new $50 million Series A led by Framework Ventures, to lease warehouses AI-controlled picking robots under a monthly 'robots-as-a-service' model built on Physical Intelligence's AI.→
  6. WhiteLab Genomics Raises $26M to Design Gene Therapies With AIParis-founded WhiteLab Genomics raised a $26 million Series B led by AVP to expand ALFRED, its AI platform for designing delivery systems for cell and gene therapies.→
  7. Vitalize Raises $31M To Automate Hospital StaffingVitalize raised a $31 million Series A led by Oak HC/FT to expand its AI platform for real-time hospital labor scheduling and capacity management, which it says saves health systems over 2,000 clinical hours a day.→
  8. Flai Raises $27M Series A For Dealership AI AgentsFlai raised a $27 million Series A led by Base10 Partners to expand its AI-native CRM for auto dealerships, which the company says has grown more than 20x in the past year.→
  9. YC Adds Two New General PartnersY Combinator named Juni Learning and Acely co-founder Vivian Midha Shen and Cron founder Raphael Schaad as General Partners, elevating both from Visiting Partner after two batches working with YC's startups.→
  10. Miami's Jeeves Raises $110M For Stablecoin BankingMiami-based Jeeves raised $110 million in equity funding led by CoinFund to scale its stablecoin-native banking platform and launch a wallet making payouts across 190 countries.→
  11. Peak XV Raises Surge Seed Check Size To $5MPeak XV Partners raised the maximum seed check in its Surge accelerator program to $5 million and unveiled an 18-startup cohort, raising the bar for what a competitive seed round now looks like.→
  12. Numeral Raises $100M To Automate Sales Tax With AINumeral raised a $100 million Series C led by Insight Partners, its second large raise in about a year, taking total funding to $157.5 million as it expands its AI-driven sales-tax compliance platform for e-commerce and SaaS companies.→
  13. Hubble Network Raises $200M At $1.6B ValuationHubble Network raised a $200 million Series C at a $1.6 billion valuation and opened its satellite-to-Bluetooth network to any BLE device, expanding a service that already reaches more than 90 million devices through partners like Life360 and Tile.→
  14. Firecrawl Raises $75M To Build A Data Library For AgentsFirecrawl, the open-source web-data extraction startup used by more than 1.5 million developers, raised a $75 million Series B led by Smash Capital and launched Alexandria, a unified data interface meant to feed AI agents.→
  15. Confido Raises $55M To Automate CPG Back OfficesConfido raised a $55 million Series B led by Insight Partners to expand its AI platform automating finance, trade-spend and demand-planning workflows for consumer packaged goods brands like Olipop and Dude Wipes.→
  16. Angle Health Raises $600M, Hits $2.7B ValuationAngle Health, an AI-native health insurer built for small businesses, raised $600 million combining a $200 million Series C and a $400 million secondary tender offer, valuing the company at $2.7 billion and led by Vitruvian Partners.→
  17. Nine US Rounds, $8.7B, Ten Days: September's Real PaceValue Add Pulse totaled the nine largest US venture rounds of September 5-11 and found $8.7 billion committed, with three deals at $1 billion or more.→
  18. Sam Altman Says Y Combinator Taught Him To Govern, Not RuleSam Altman credited his Y Combinator years with teaching him to govern rather than rule at OpenAI, conceding the company will not get every decision right as it faces safety legislation and an IPO question.→
  19. YC's Newest Batch Skews Deep Tech: Barges, Brain Chips, MarsY Combinator's September 2026 Demo Day produced nine startups VCs flagged as buzziest, spanning floating nuclear data centers, jet-powered counter-drones, brain-cell computing and humanoid robots, with valuations investors described as more grounded than recent batches.→
  20. Garry Tan Wants US Labs Distilling Frontier ModelsY Combinator's Garry Tan is pushing US open-weight AI labs to distill frontier models just as aggressively as Chinese labs do, arguing restrictions would hurt the ecosystem more than any single company's IP.→
  21. Stoke Space Raises $1B to Out-Reuse SpaceXStoke Space closed a $1 billion Series E led by Point72 Ventures and Spark Capital, pushing total funding to $2.3 billion as it builds a rocket designed so both stages fly back and refly.→
  22. The 10x Markup in Five Months Is the Real StoryAfterQuery went from a $300 million post-money in April to a reported $3.2 billion in September. I think the interesting number is not the valuation but the interval, and what it says about who is actually setting prices in AI services.→
  23. AfterQuery Becomes YC's Fastest-Ever Unicorn at $3.2BAfterQuery, which pays doctors and lawyers to train AI models, reportedly hit a $3.2 billion valuation just five months after its $30 million Series A -- the fastest run from launch to unicorn in Y Combinator's history.→
  24. Apollo Atomics Raises $31M to Shrink Nuclear ReactorsApollo Atomics, an MIT spinoff, raised a $31M seed to build factory-made compact nuclear reactors with 40x smaller footprints, targeting AI data centers hungry for dedicated power.→
  25. Sequoia, Khosla, Y Combinator Lead 2026's Unicorn ClassSequoia Capital, Khosla Ventures and Y Combinator top the list of investors backing 2026's new unicorns, with 250 companies reaching billion-dollar valuations through August 15 -- up from 193 in all of 2025, per Crunchbase data.→
  26. August's Mega-Rounds Have Already Cleared $9BFive disclosed rounds in the first two weeks of August 2026 -- Databricks, Firmus, River AI, Lovable and Form Energy -- total roughly $9.25 billion, with data infrastructure and AI compute taking three quarters of it.→
  27. The Seed Round Is Now an Infrastructure RoundRiver AI raised $1.1 billion across a seed and Series A two months after leaving stealth, the clearest example yet of a 2026 pattern where pre-product AI infrastructure companies raise growth-stage sums at formation.→
  28. Blacksmith's Valuation Jumps 10x to $550M in Under a YearBlacksmith, a code-testing and validation startup, raised a $45 million Series B led by Peak XV Partners at a $550 million valuation, up from $60 million less than a year earlier, as AI-generated code drives demand for faster validation.→
  29. General Catalyst Leads $1.1B Round Into 2-Month-Old River AIRiver AI, founded by xAI co-founder Igor Babuschkin, raised $1.1 billion led by General Catalyst just two months after stealth, betting enterprises can train AI models without a dedicated infra team.→
  30. Robinhood's YC-Linked Retail Fund Nears NYSE DebutRobinhood Ventures Fund II, a closed-end fund giving retail investors exposure to 80 early-stage startups linked to Y Combinator, closes its share-request window August 12 ahead of a planned NYSE debut at $25 a share on August 13.→
  31. Naive Raises $28.5M for AI Agents That Run CompaniesNaive raised a $28.5M Series A led by Nexus Venture Partners to let AI coding agents like Cursor and Claude Code provision payments, phone numbers and US LLC incorporation through a single API.→
  32. Robinhood Lists a Fund That Buys Y Combinator StakesRobinhood Ventures Fund II is set to list publicly on August 13 at $25 a share, aiming to raise $200M so retail investors can indirectly back roughly 80 Y Combinator-linked private companies -- while paying Robinhood 2% and 20% carry.→
  33. Robinhood Lets Retail Investors Back Y Combinator StartupsRobinhood is listing a publicly tradable fund that invests in current and former Y Combinator startups, opening up to $200M of early-stage venture exposure to any retail investor for the first time.→
  34. Robinhood Opens Y Combinator Startups to RetailRobinhood's second closed-end venture fund, set to list publicly on August 13 at $25/share, will let any retail investor buy exposure to Y Combinator startups for the first time.→
  35. HappyRobot Hits Unicorn Status With $150M Series CHappyRobot raised $150M at a $1.2B valuation just eight months after its Series B, with a16z and Eurazeo betting AI voice agents can expand from freight brokering into insurance, energy and airlines.→
  36. YC's Open-Sourced Agent Tool Rethinks Who the User IsY Combinator open-sourcing QM, the multiplayer AI agent harness it built to run its own accounting, legal, events and engineering work, is a bet that the real unlock in agent tooling is coordinating a whole company, not another personal chatbot.→
  37. Y Combinator Open-Sources Its Internal AI Agent ToolY Combinator open-sourced QM, the multiplayer AI agent harness it built to run its own accounting, legal, events and engineering work, giving any startup a free blueprint for company-wide agent deployment.→
  38. Inside the 25-Company Letter Backing Openweight AI ModelsNvidia, Microsoft, Meta, a16z, IBM, Dell, Palantir, Mistral, Hugging Face and Y Combinator jointly argued open-weight AI models keep America competitive against China, while OpenAI and Anthropic declined to sign.→
  39. Nvidia, Microsoft, Meta Lead 25-Company Push for Openweight AI ModelsTwenty-five companies including Nvidia, Microsoft, Meta and a16z published a joint letter urging Washington to avoid "premature restrictions" on open-weight AI models, with OpenAI and Anthropic notably absent from the signatories.→
  40. General Catalyst Overtakes Y Combinator in Fintech Deal CountGeneral Catalyst has pulled ahead of Y Combinator as the most active lead investor in fintech rounds of $5 million or more, ending YC's long run atop the category.→

Y Combinator FAQ

What companies has Y Combinator invested in?

Y Combinator's portfolio includes Ultra Robotics, Santé, Flai, Vitalize, Supabase, Halluminate, and 23 more tracked companies.

Who does Y Combinator co-invest with most?

In the rounds Value Add tracks, Y Combinator most often invests alongside SV Angel (4 shared deals), Andreessen Horowitz (3 shared deals), Base10 Partners (3 shared deals), Benchmark (3 shared deals), Coatue Management (3 shared deals).

Sources & methodologyshow
Where these figures come from

Figures are labelled Reported (a source states it), Estimated, Derived (computed from other facts) or Rumored (in talks / unconfirmed). Rumors never replace a confirmed figure. Each figure keeps its own as-of date; history is preserved rather than overwritten.

How we verify data ·