Companies / Callsign
Callsign
Company
Callsign provides fraud prevention, authentication, and intelligence solutions to businesses.
Callsign has 9 investors on file, among them Accel, Allegis Capital and Capital One Ventures. Its site was last checked 12 Nov 2026: site answers.
Investors
9 investors on file| Investor | Evidence | Type |
|---|---|---|
| Portfolio page | Venture capital | |
| Portfolio page | Venture capital | |
| Portfolio page | Corporate VC | |
| Portfolio page | Corporate VC | |
| Portfolio page | Venture capital | |
| Portfolio page | Venture capital | |
| Portfolio page | Corporate VC | |
| Portfolio page | Venture capital | |
| Portfolio page | Venture capital |
A company is shown only after its own site answers and carries its name. Sites are checked again on a schedule, because domains lapse and get bought. Round stages and dates come from Fundup AI; investor links come from portfolio pages and rounds; other facts name their source when you point at them. How we grade the data
Get Callsign and its investors as data
Look up any company's investors, or any investor's full portfolio, through one API key or MCP. A free account also opens Ask AI searches and alerts when Accel 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/companies/callsign.com/investors
# also
GET /v1/companies/callsign.com
GET /v1/companies/callsign.com/news