Key facts
- It has raised $500K; the latest was Early Stage VC in Mar 2026.
- Notable investors include Y Combinator, Team Ignite Ventures, Brickyard.
- Status: Privately Held (backing).
- ·The complete investor list — 3 names
- ·Watchlist + deal alerts for Costream
- ·The full record, as it builds
Funding rounds
No funding rounds for Costream are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
About Costream
Developer of digital products intended for indexing human dialogue. The company is currently operating in Stealth Mode.
- Sector
- Business Products and Services (B2B)
- HQ
- San Francisco, CA, United States
- Founded
- 2025
- Employees
- 6
- Website
- costream.ai/
- Ownership
- Privately Held (backing)
Costream doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Costream shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Costream in its N-PORT filings yet. We sweep new filings monthly.