Accelerator
Y Combinator portfolio
ycombinator.comY Combinator is an accelerator based in Mountain View, United States, founded in 2005. It has invested in 1,295 venture-backed companies across 1,678 funding rounds on VCMC, and led 197 of those rounds. 256 of them were in the last 12 months.
1,295
Venture-backed companies
in its portfolio on VCMC
1,678
Funding rounds
led 197
256
Last 12 months
rounds, Oct 2025 to Sep 2026
185
With a disclosed valuation
of 1,295 companies
$573.8B
Combined value of its private companies
the whole companies, not what Y Combinator owns
1,257 private companies Y Combinator has backed have a VCMC valuation; together they are worth $573.8B. That is the value of the whole companies, not what Y Combinator owns. Kalshi is 4% of the total. 38 companies it backed have since been acquired and are not included. How VCMC values companies.
Values cover private companies only; public companies are not included.
Portfolio
Y Combinator's most valuable portfolio companies
The 10 most valuable private companies Y Combinator has backed, by VCMC's valuation. Values cover private companies only; public companies are not included.
- 1 Kalshi Financial Services, New York $25.2B range $19.1B – $34.0B Joined at Series C, 2025
- 2 Rippling Tech Companies, San Francisco $23.4B range $15.5B – $26.9B Joined at Series A, 2019
- 3 Whatnot Tech Companies, San Francisco $21.1B range $17.4B – $29.9B Led at Seed, 2020
- 4 Faire General Retail & Merchandise, San Francisco $20.3B range $8.0B – $29.3B Led at Series C, 2018
- 5 Relativity Space Aerospace and Defence, Long Beach $19.0B range $10.6B – $26.9B Joined at Series B, 2018
- 6 Deel Software Development Services, San Francisco $18.4B range $15.0B – $21.2B Led at Seed, 2019
- 7 Gusto Tech Companies, San Francisco $18.0B range $7.1B – $20.7B Led at Series C, 2018
- 8 Helion Renewable energy companies, Everett $17.2B range $13.5B – $23.4B Joined at Seed, 2014
- 9 Supabase Tech Companies, Singapore $11.9B range $9.1B – $16.6B Joined at Series C, 2024
- 10 OpenSea Tech Companies, Miami $10.7B range $1.5B – $21.9B Led at Pre-seed, 2018
Portfolio
Full Y Combinator portfolio (1,295 companies)
1,295 companies. Load more shows the rest.
| # | Last round | History | Range | Trend | Grade | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Flexport Trucking and Logistics · since Seed, 2015 | Debt Jan 2023 $260M | $6.3B | $698M – $11.0B | $5.9B (-5%) | $1.3B | 20% | 2,949 | flat | D | |
| 2 | Kalshi Financial Services · since Series C, 2025 | Series F May 2026 $1.00B | $25.2B | $19.1B – $34.0B | $29.6B (+17%) | $3.3B | 0% | 583 | growing | A | |
| 3 | Relativity Space Aerospace and Defence · since Series B, 2018 | Series F Nov 2023 $1.05B | $19.0B | $10.6B – $26.9B | $15.4B (-19%) | $2.1B | 0% | 1,991 | growing | B | |
| 4 | Stoke Space Aerospace and Defence · since Series B, 2023 | Series E Sep 2026 $1.00B | $10.3B | $8.7B – $15.0B | $13.1B (+26%) | $1.4B | 0% | 441 | growing | A | |
| 5 | Rippling Tech Companies · since Series A, 2019 | Series G May 2025 $450M | $23.4B | $15.5B – $26.9B | $23.4B (0%) | $2.6B | 0% | 7,815 | growing | A | |
| 6 | Whatnot Tech Companies · led at Seed, 2020 | Series G Aug 2026 $545M | $21.1B | $17.4B – $29.9B | $26.0B (+23%) | $2.9B | 0% | 2,162 | growing | A | |
| 7 | Helion Renewable energy companies · since Seed, 2014 | Series G Jun 2026 $465M | $17.2B | $13.5B – $23.4B | $20.4B (+18%) | $2.2B | 0% | 589 | growing | A | |
| 8 | Legora Tech Companies · since Series A, 2024 | Series E Oct 2026 $550M | $8.8B | $7.7B – $13.2B | $11.4B (+30%) | $1.4B | 0% | 187 | up | A | |
| 9 | Astranis Aerospace and Defence · since Seed, 2016 | Series E May 2026 $300M | $3.2B | $2.4B – $4.3B | $3.7B (+16%) | $410M | 0% | 563 | up | A | |
| 10 | RiverAI Software Development Services · since Seed, 2026 | Seed Aug 2026 $1.10B | $21.9M | $9.67M – $76.8M | $38.5M (+76%) | $7.56M | 0% | 16 | growing | D | |
| 11 | Faire General Retail & Merchandise · led at Series C, 2018 | Series G Nov 2021 $400M | $20.3B | $8.0B – $29.3B | $20.3B (0%) | $2.8B | 4% | 7,705 | growing | C | |
| 12 | Monzo Banks & ATMs · led at Growth, 2019 | Series I Dec 2024 $534M | $9.7B | $5.5B – $13.7B | $9.7B (0%) | $1.2B | 0% | 5,631 | growing | B | |
| 13 | Supabase Tech Companies · since Series C, 2024 | Series F Jun 2026 $500M | $11.9B | $9.1B – $16.6B | $14.4B (+21%) | $1.8B | 0% | 455 | growing | A | |
| 14 | Deel Software Development Services · led at Seed, 2019 | Series E Oct 2025 $300M | $18.4B | $15.0B – $21.2B | $15.1B (-18%) | $2.6B | 81% | 9,646 | flat | A | |
| 15 | BioRender Tech Companies · led at Seed, 2018 | Growth Equity Dec 2025 $900M | $9.7B | $6.6B – $14.0B | $8.6B (-12%) | $926M | 46% | 262 | up | B | |
| 16 | Solugen Chemicals · since Seed, 2017 | Growth Equity Mar 2026 $50M | $584M | $369M – $917M | $570M (-2%) | $55.5M | 26% | 136 | flat | B | |
| 17 | Rappi Groceries Delivery · since Growth, 2018 | Series F Jul 2021 $500M | $6.8B | $456M – $7.9B | $6.8B (0%) | $916M | 0% | – | unknown | D | |
| 18 | Olive Tech Companies · since Series B, 2015 | Series H Jul 2021 $400M | $3.6B | $348M – $6.0B | $3.5B (-4%) | $572M | 20% | 660 | unknown | D | |
| 19 | Replit Tech Companies · since Seed, 2018 | Growth Equity Mar 2026 $400M | $10.5B | $7.8B – $13.3B | $11.6B (+10%) | $1.0B | 0% | 709 | growing | A | |
| 20 | Cart.com Tech Companies · since Series B, 2021 | Growth Equity Mar 2026 $180M | $2.0B | $1.4B – $3.0B | $2.1B (+3%) | $190M | 0% | 880 | up | B | |
| 21 | Razorpay Payment Processing & Point of Sale · led at Series B, 2018 | Series F Dec 2021 $375M | $5.0B | $764M – $13.1B | $5.0B (0%) | $1.4B | 46% | 3,700 | unknown | D | |
| 22 | Fivetran Tech Companies · since Series D, 2021 | Series D Sep 2021 $565M | $7.2B | $1.0B – $10.7B | $6.9B (-4%) | $1.1B | 0% | 1,851 | up | D | |
| 23 | Bird Tech Companies · since Series C, 2020 | Debt Sep 2026 $450M | $403M | $189M – $2.7B | $403M (0%) | $468M | 97% | 302 | down | D | |
| 24 | Aspire Payment Processing & Point of Sale · since Series A, 2019 | Growth Equity Jan 2024 $79M | $930M | $196M – $1.4B | $878M (-6%) | $96.2M | 0% | 1,112 | flat | C | |
| 25 | Flock Safety Alarms, Surveillance & Security Systems · led at Seed, 2017 | Growth Equity Jul 2026 $275M | $7.7B | $6.5B – $9.5B | $8.3B (+7%) | $743M | 0% | 1,434 | up | A | |
| 26 | Noom Nutritionists & Weight Loss Specialists · since Series E, 2019 | Series F May 2021 $540M | $2.4B | $263M – $7.5B | $2.2B (-7%) | $684M | 30% | 1,200 | flat | D | |
| 27 | Gusto Tech Companies · led at Series C, 2018 | Series E Aug 2021 $175M | $18.0B | $7.1B – $20.7B | $18.0B (0%) | $2.0B | 0% | 8,228 | growing | B | |
| 28 | Xendit Payment Processing & Point of Sale · since Series B, 2021 | Debt Sep 2024 $50M | $1.4B | $170M – $3.8B | $1.3B (-10%) | $377M | 28% | 620 | flat | D | |
| 29 | CuspAI Research Institutes · since Series A, 2025 | Series B Jul 2026 $450M | $2.9B | $2.3B – $4.5B | $3.9B (+35%) | $429M | 0% | 94 | growing | B | |
| 30 | GrubMarket Groceries Delivery · since Seed, 2015 | Series H Feb 2026 $50M | $4.9B | $4.0B – $5.9B | $4.6B (-7%) | $663M | 59% | 126 | up | A | |
| 31 | Checkr Detectives & Investigation Services · led at Series B, 2016 | Series E Sep 2021 $250M | $5.1B | $728M – $8.5B | $5.0B (-3%) | $879M | 0% | 1,829 | up | D | |
| 32 | Goat Group Shoes & Other Footwear Stores · since Seed, 2011 | Series F Jun 2021 $195M | $978M | $350M – $6.7B | $821M (-16%) | $656M | 93% | 959 | down | D | |
| 33 | Flutterwave Payment Processing & Point of Sale · since Seed, 2016 | Series E Jun 2026 | $3.3B | $2.8B – $4.2B | $3.4B (+3%) | $458M | 53% | 875 | down | A | |
| 34 | Vanta Tech Companies · since Seed, 2018 | Series D Jul 2025 $150M | $6.1B | $3.8B – $7.1B | $6.1B (0%) | $676M | 0% | 1,994 | growing | B | |
| 35 | Pave Tech Companies · led at Series A, 2020 | Series C Jun 2022 $100M | $1.6B | $278M – $2.8B | $1.5B (-4%) | $279M | 0% | 297 | up | D | |
| 36 | Kapital Bank Banks & ATMs · since Series A, 2023 | Series C Sep 2026 $125M | $1.3B | $914M – $2.4B | $1.7B (+26%) | $226M | 0% | 3,647 | growing | B | |
| 37 | Starcloud Tech Companies · since Seed, 2025 | Growth Equity Aug 2026 $250M | $2.3B | $2.0B – $2.9B | $2.5B (+8%) | $228M | 0% | 21 | up | A | |
| 38 | Human Interest Retirement Planning · since Series A, 2018 | Series F Oct 2025 $100M | $4.0B | $2.6B – $4.7B | $4.0B (+1%) | $445M | 0% | 916 | up | A | |
| 39 | OpenSea Tech Companies · led at Pre-seed, 2018 | Series C Jan 2022 $300M | $10.7B | $1.5B – $21.9B | $10.1B (-6%) | $2.4B | 33% | 701 | flat | D | |
| 40 | Athelas Tech Companies · since Seed, 2017 | Growth Equity May 2026 $70M | $7.0B | $6.1B – $8.1B | $5.7B (-19%) | $675M | 97% | 315 | shrinking | A | |
| 41 | Podium Tech Companies · led at Series A, 2017 | Series D Nov 2021 $201M | $3.4B | $497M – $4.3B | $3.2B (-5%) | $459M | 0% | 1,637 | up | D | |
| 42 | Boom Aircraft Parts & Services · since Seed, 2016 | Series B Dec 2025 $300M | $2.1B | $1.3B – $2.5B | $2.1B (+2%) | $259M | 19% | 360 | up | B | |
| 43 | Quantive Tech Companies · since Series C, 2021 | Series C Dec 2021 $120M | $248M | $71.7M – $2.1B | $247M (0%) | $156M | 97% | 72 | down | D | |
| 44 | Campus Colleges & Universities · since Series A, 2023 | Series B Mar 2025 $46M | $474M | $163M – $673M | $474M (0%) | $52.2M | 0% | 310 | unknown | C | |
| 45 | Formance Tech Companies · since Pre-seed, 2022 | Series A Jan 2025 $21M | $212M | $93.8M – $300M | $212M (0%) | $32.3M | 0% | 55 | growing | B | |
| 46 | Charlie AI Tech Companies · since Series A, 2018 | Series A Nov 2018 $9.0M | $62.2M | $4.24M – $94.7M | $57.7M (-7%) | $12.6M | 0% | 14 | up | D | |
| 47 | Tenyks Tech Companies · since Seed, 2022 | Seed Mar 2022 $3.4M | $13.6M | $1.50M – $48.5M | $12.5M (-8%) | $8.53M | 45% | 14 | down | D | |
| 48 | Tech Companies · since Seed, 2017 | Series E Jan 2022 $200M | $1.4B | $367M – $5.7B | $1.4B (-5%) | $575M | 71% | 56 | down | D | |
| 49 | Tech Companies · since Series A, 2024 | Series C May 2026 $250M | $2.6B | $1.9B – $3.8B | $3.3B (+26%) | $362M | 0% | 221 | growing | B | |
| 50 | Tech Companies · led at Seed, 2016 | Series E Jan 2022 $150M | $3.9B | $532M – $5.5B | $3.9B (0%) | $527M | 0% | 876 | up | D |
Valuation: VCMC's valuation with its range, from a low to a high scenario; a company with no valuation shows a dash, one acquired after its last round its last value as a private company.
Activity
How Y Combinator invests: stages, industries and countries
Most of its rounds are seed (50%). Its companies span 131 industries, most in Tech Companies, Software Development Services and Payment Processing & Point of Sale, across 50 countries.
Rounds by stage
- Pre-seed 89
- Seed 838
- Series A 450
- Series B 159
- Series C and later 142
Investments by industry
- Tech Companies 721
- Software Development Services 87
- Payment Processing & Point of Sale 58
- Biotechnology 36
- Aerospace and Defence 18
- Hosting & Cloud Infrastructure Providers 17
- Investment Consultants & Financial Advisors 17
- Loans & Financing 14
Investments by country
- United States 956
- United Kingdom 41
- India 40
- Canada 34
- France 21
- Germany 18
Recent rounds
Y Combinator's latest investments
Y Combinator's most recent funding rounds, newest first. 256 rounds in the last 12 months.
- Series D $130M 22 Oct 2026
- Series C $66M 21 Oct 2026
- Series A $15M 21 Oct 2026
- Series A $10M 13 Oct 2026
- Series A $50M 9 Oct 2026
- Series B $90M 7 Oct 2026
- Series A $47M 6 Oct 2026
- Series A $31M 6 Oct 2026
- Series A $30M 1 Oct 2026
- Series C $200M 25 Sep 2026
Co-investors
Y Combinator's top co-investors
The investors that most often join the same rounds as Y Combinator. Soma Capital leads, with 122 rounds together.
- Soma Capital 122 rounds together
- 111 rounds together
- Andreessen Horowitz 106 rounds together
- General Catalyst 100 rounds together
- 92 rounds together
- Sequoia Capital 81 rounds together
- SV Angel 71 rounds together
- Accel 69 rounds together
- Khosla Ventures 67 rounds together
- 66 rounds together
About
About Y Combinator
Y Combinator Management, LLC is an American venture capital firm and startup accelerator engaged in providing seed funding, mentorship, and community support to early-stage technology companies. The company operates a business incubator model, offering mentorship, office hours, and access to a network of domain experts, and also facilitates job opportunities for founders and alumni through its online platform.
Description from Veridion's company data.
- Founded
- 2005
- Based in
- Mountain View, United States
- Team
- 3,900 people, +0% in a year
- Type
- Accelerator
Focus markets
- Technology
What Y Combinator offers
- Startup Funding Investment
- Startup Mentorship Services
- Community Network Access
- Alumni Network Access
- Job Search Platform Services
- Entrepreneurial Education Services
- Startup Growth Support Services
- Innovation Community Building Services
Questions
Y Combinator: frequently asked questions
How many companies has Y Combinator invested in?
1,295 venture-backed companies on VCMC, across 1,678 funding rounds.
What are Y Combinator's most valuable private companies?
Kalshi ($25.2B), Rippling ($23.4B), Whatnot ($21.1B), by VCMC's valuation.
What was Y Combinator's latest investment?
Tractian, a Series D round in Oct 2026 of $130M.
Which stages does Y Combinator invest in?
Y Combinator invests most often at seed (838 rounds), followed by Series A (450) and Series B (159). It has also joined 142 Series C and later and 89 pre-seed rounds.
What is Y Combinator's portfolio worth?
Its private companies with a VCMC valuation are worth $573.8B together. That is the sum of the companies' values, not what Y Combinator owns.
Who does Y Combinator invest alongside?
Soma Capital (122 rounds), Pioneer Fund (111 rounds), Andreessen Horowitz (106 rounds).