Investors / Breyer Capital / Compare with Castle Island Ventures
Breyer Capital vs Castle Island Ventures
Breyer Capital lists 106 portfolio companies and has joined 15 funding rounds; Castle Island Ventures lists 25 companies and has joined 15 rounds. Breyer Capital comes in most often at Series A (36% of its entries), Castle Island Ventures comes in most often at Seed (50% of its entries). 1 company is on both portfolios, among them Fireblocks Dynamic.
Show as a table
| Breyer Capital | Castle Island Ventures | |
|---|---|---|
| Portfolio companies | 106 | 25 |
| Funding rounds joined | 15 | 15 |
| Rounds led | 0 | 7 |
| Rounds, last 12 months | 5 | 10 |
| Typical round it comes in at | $20M to $100M | $5M to $20M |
| Sites no longer answering | 0% | 0% |
Where they come in
share of entries by stageBreyer CapitalCastle Island Ventures
Show as a table
| Breyer Capital | Castle Island Ventures | |
|---|---|---|
| Pre-seed | 0% | 0% |
| Seed | 14% | 50% |
| Series A | 36% | 42% |
| Series B | 21% | 8% |
| Growth | 29% | 0% |
Themes
share of checked companiesBreyer CapitalCastle Island Ventures
Show as a table
| Breyer Capital | Castle Island Ventures | |
|---|---|---|
| Fintech | 20% | 58% |
| Healthcare & Biotech | 23% | 3% |
| AI & Machine Learning | 14% | 3% |
| Cybersecurity | 3% | 11% |
| Crypto & Web3 | 0% | 11% |
| Enterprise Software | 9% | 3% |
Companies both back
1Shared 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 Breyer Capital and Castle Island Ventures 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/breyercapital.com/portfolio
# also
GET /v1/firms/castleisland.vc/portfolio
GET /v1/firms/breyercapital.com/coinvestors