Investors / Y Combinator / Compare with Zero Index
Y Combinator vs Zero Index
Y Combinator lists 5,153 portfolio companies and has joined 3,388 funding rounds; Zero Index lists 61 companies and has joined 1 round. Y Combinator comes in most often at Seed (98% of its entries), Zero Index comes in most often at Seed (100% of its entries). 30 companies are on both portfolios, among them Adialante, Agency Tool Company and Aktoria Robotics.
Show as a table
| Y Combinator | Zero Index | |
|---|---|---|
| Portfolio companies | 5,153 | 61 |
| Funding rounds joined | 3,388 | 1 |
| Rounds led | 2,960 | 0 |
| Rounds, last 12 months | 579 | 1 |
| Typical round it comes in at | under $1M | $1M to $5M |
| Sites no longer answering | 0% | 0% |
Where they come in
share of entries by stageY CombinatorZero Index
Show as a table
| Y Combinator | Zero Index | |
|---|---|---|
| Pre-seed | 0% | 0% |
| Seed | 98% | 100% |
| Series A | 1% | 0% |
| Series B | 0% | 0% |
| Growth | 1% | 0% |
Themes
share of checked companiesY CombinatorZero Index
Show as a table
| Y Combinator | Zero Index | |
|---|---|---|
| AI & Machine Learning | 26% | 30% |
| Fintech | 13% | 5% |
| Healthcare & Biotech | 11% | 8% |
| Enterprise Software | 10% | 10% |
| Cybersecurity | 5% | 8% |
| Industrial & Manufacturing | 4% | 8% |
Companies both back
30Shared companies are those both firms' own portfolio pages list, each checked against the company's site. The same comparison through the API is POST /v1/overlap, for up to 20 firms. How the data is graded
Compare Y Combinator and Zero Index as data
Pull both portfolios and every co-investor through one API key or MCP, and lay up to 20 firms side by side with POST /v1/overlap. A free account adds Ask AI searches and alerts when either firm adds a company.
Work email, sign-in link by email. Already have an account? Log in- Ask AI5 plain-English investor searches a day
- Full listsEvery portfolio row and two-firm overlap
- API and MCP100 REST or MCP calls a month, one key
- AlertsFollow 5 investors for portfolio and fund changes
$ curl -H "X-API-Key: YOUR_KEY" \
https://api.vcinfo.io/v1/firms/ycombinator.com/portfolio
# also
GET /v1/firms/zeroindex.vc/portfolio
GET /v1/firms/ycombinator.com/coinvestors