Investors / United States / Y Combinator
Y Combinator
Accelerator · San Francisco, CA, United States · North America
Y Combinator runs a three-month startup program four times a year, in which founders work with YC partners in small groups and attend weekly talks and office hours. It invests $500k per company and helps companies raise additional funds by introducing them to its investor network.
Invests inAI & Machine Learning
In its own wordsacceleratorstartupsfounder communitydemo dayseed funding
Your fit with Y Combinator
Four questions about your startup
See how your round matches what it backs, point by point.
Or find every investor that fitsY Combinator lists 5,153 checked portfolio companies on its own site and is named in 3,373 funding rounds, 2,945 of them as lead. Its most frequent entry is Seed, 98% of the companies with a known first round. Its largest themes are AI & Machine Learning (26%), Fintech (13%) and Healthcare & Biotech (11%). 77% of its companies are based in United States. It invests most often alongside Soma Capital, Transpose Platform and Eight Capital.
Counts come from funding rounds that name Y Combinator, complete from mid-2025: earlier rounds appear only when they were reported later. Round amounts and full round histories are on Fundup AI.
Entry stage
share of companies by the stage of its first roundShow as a table
| Value | |
|---|---|
| Pre-seed | 0% |
| Seed | 98% |
| Series A | 1% |
| Series B | 0% |
| Growth | 1% |
Activity by year
rounds it joined, last 10 yearsShow as a table
| Total | Rounds it led | |
|---|---|---|
| '17 | 0 | 0 |
| '18 | 1 | 0 |
| '19 | 2 | 0 |
| '20 | 15 | 12 |
| '21 | 594 | 591 |
| '22 | 551 | 542 |
| '23 | 428 | 421 |
| '24 | 525 | 508 |
| '25 | 705 | 550 |
| '26 | 549 | 321 |
Investor profile
percentile among all firmsShow as a table
| Measure | Percentile of all firms | Value |
|---|---|---|
| Portfolio size | 100th | 5,167 companies |
| Recent activity | 100th | 579 rounds in 12 months |
| Early stage | 86th | 99% of entries at pre-seed or seed |
| Evidence | 100th | 51% of companies confirmed by a round |
| Sector focus | 40th | 26% in its largest sector |
| Reach | 100th | 80 countries |
Investment themes
share of its checked companiesThis firmAll checked companies
Show as a table
| This firm | All checked companies | |
|---|---|---|
| AI & Machine Learning | 26% | 18% |
| Fintech | 13% | 12% |
| Healthcare & Biotech | 11% | 15% |
| Enterprise Software | 10% | 8% |
| Education | 5% | 7% |
| E-commerce & Marketplaces | 5% | 6% |
| Cybersecurity | 5% | 4% |
| Space & Defense | 5% | 3% |
Invests most often with
firms sharing its portfolio companiesShow as a table
| Share | |
|---|---|
| Soma Capital | 372 |
| Transpose Platform | 270 |
| Eight Capital | 204 |
| FundersClub | 171 |
| Multimodal Ventures | 105 |
| Andreessen Horowitz | 103 |
| Initialized | 91 |
| General Catalyst | 84 |
Its portfolio companies
where they are based, and what their own sites showSite status
- Site answers4,98397%
- No longer answers00%
- Points to another company1703%
- Parked or sold domain00%
A site that stops answering three checks in a row is counted as no longer answering; that is not proof of closure. A site that points to another company is often an acquisition. The firm itself reports 410 acquired, 1 public and 331 inactive.
Co-investor network
who it backs companies with, and who they back togetherCompare Y Combinator head to head
portfolio size, rounds, entry stages, themes and the companies both backThree or more firms at once: portfolio overlap.
Recent portfolio activity
when companies last raised with Y Combinator| Date | Company | Stage |
|---|---|---|
| 11 Nov 2026 | Series A | |
| 10 Nov 2026 | Series B | |
| 6 Nov 2026 | Pre-Seed | |
| 29 Oct 2026 | Series A | |
| 28 Oct 2026 | Series B | |
| 28 Oct 2026 | Series A | |
| 28 Oct 2026 | Seed | |
| 27 Oct 2026 | Seed Led |
Round details for Y Combinator
Amounts, full round histories and every co-investor in Y Combinator's rounds are on Fundup AI. VCinfo covers investors and their portfolios.
Portfolio
5,153 companies checked against their own sites| Company | What it does | Themes | First round with it | Evidence |
|---|---|---|---|---|
| The company provides a security solution that identifies and fixes vulnerabilities in software | Cybersecurity | Portfolio page | ||
| The company provides a hiring service that uses AI automation and human recruiters to find and present qualified tech candidates to companies. | Human ResourcesAI & Machine Learning | Portfolio page | ||
| The company provides an AI-powered patient recall system for dental practices | Healthcare & BiotechAI & Machine Learning | Jan 2025Seed | Page + round | |
| 10x Science develops software to molecularly characterize proteins at scale and analyze complex data in real time. | Healthcare & Biotech | Apr 2026Seed | Page + round | |
Healthcare & Biotech | Mar 2026Seed | Funding round | ||
| The company helps mines extract more copper from low-grade ores using engineered microbes. | Industrial & ManufacturingAI & Machine Learning | Jun 2024Seed | Page + round | |
| The company pioneers small and large molecule therapeutics discovery by integrating massive multimodal data, frontier AI models, and high-throughput lab automation into an infrastructure for AI-enabled drug discovery. | Healthcare & Biotech | Portfolio page | ||
| The company operates a marketplace that connects influencers with brands for partnerships and collaborations. | Media & EntertainmentE-commerce & Marketplaces | Jan 2023Seed | Page + round | |
| The company provides React components, templates, and themes for building user interfaces. | Healthcare & BiotechFintech | Jan 2026Seed | Page + round | |
| The company plans social events like dinner and boat cruises to help people meet and date. | Enterprise SoftwareLegal & Compliance | Jan 2023Seed | Page + round | |
Media & EntertainmentHealthcare & Biotech | Portfolio page | |||
| Portfolio page | ||||
| The company develops a platform and products for advanced therapeutics, including gene therapies, cell therapies, and biologics. | Healthcare & Biotech | Portfolio page | ||
| The company develops tactile sensing hardware for robotics | Robotics & Hardware | Jul 2026Pre-Seed | Page + round | |
| Portfolio page | ||||
| The company provides career advice and resources to help individuals make a positive impact with their career choices. | EducationHuman Resources | Portfolio page | ||
| The company creates novel materials, including magnetic materials, critical mineral extraction materials, semiconductor packaging materials, and materials science RL environments. | Industrial & Manufacturing | Portfolio page | ||
| Portfolio page | ||||
| The company provides a platform for building and publishing mobile apps | AI & Machine LearningFintech | Jan 2025Seed | Page + round | |
| The company allows users to create and play apps made by others in a multiplayer environment. | Enterprise SoftwareGaming | Jan 2025Seed | Page + round |
About this data
site last read 5 Nov 2026- Site
- ycombinator.com
- Last read
- 5 Nov 2026
- Watching since
- 5 Nov 2026
- Rounds since
- 15 Mar 2013
- Companies checked
- 5,153
Rates come from what VCinfo has observed since observation_start. Firms tend to remove companies that closed, so early rates understate reality. A company leaving a portfolio page does not mean it closed or exited. An unreachable site means our checks failed, nothing more.
Get Y Combinator's profile as data
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