Investors / Castle Island Ventures / Compare with Founders Fund
Castle Island Ventures vs Founders Fund
Castle Island Ventures lists 25 portfolio companies and has joined 15 funding rounds; Founders Fund lists 134 companies and has joined 124 rounds. Castle Island Ventures comes in most often at Seed (50% of its entries), Founders Fund comes in most often at Growth (39% of its entries). 3 companies are on both portfolios, among them ARQ, Fireblocks Dynamic and Erebor.
Show as a table
| Castle Island Ventures | Founders Fund | |
|---|---|---|
| Portfolio companies | 25 | 134 |
| Funding rounds joined | 15 | 124 |
| Rounds led | 7 | 30 |
| Rounds, last 12 months | 10 | 63 |
| Typical round it comes in at | $5M to $20M | $20M to $100M |
| Sites no longer answering | 0% | 0% |
Where they come in
share of entries by stageCastle Island VenturesFounders Fund
Show as a table
| Castle Island Ventures | Founders Fund | |
|---|---|---|
| Pre-seed | 0% | 0% |
| Seed | 50% | 11% |
| Series A | 42% | 30% |
| Series B | 8% | 20% |
| Growth | 0% | 39% |
Themes
share of checked companiesCastle Island VenturesFounders Fund
Show as a table
| Castle Island Ventures | Founders Fund | |
|---|---|---|
| Fintech | 58% | 16% |
| AI & Machine Learning | 3% | 25% |
| Healthcare & Biotech | 3% | 12% |
| Cybersecurity | 11% | 3% |
| Crypto & Web3 | 11% | 3% |
| Industrial & Manufacturing | 0% | 9% |
Companies both back
3Shared 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 Castle Island Ventures and Founders Fund 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/castleisland.vc/portfolio
# also
GET /v1/firms/foundersfund.com/portfolio
GET /v1/firms/castleisland.vc/coinvestors