Key facts
- It has raised $500K; the latest was Seed Round in Mar 2026.
- Notable investors include Y Combinator, Transpose Platform Management, Pioneer Fund, Hustle Fund, TRAC VC — 8 tracked in total.
- Status: Privately Held (backing).
- ·The complete investor list — 8 names
- ·Watchlist + deal alerts for 21st
- ·The full record, as it builds
Funding rounds
No funding rounds for 21st are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
About 21st
Developer of AI-powered tools designed to assist software developers in writing code more efficiently. The company's tool offers services including Magic AI Agent, product design, and prototyping tools for AI native teams, enabling developers to generate production-ready UI components by simply describing their requirements in natural language.
- Sector
- Information Technology
- HQ
- San Francisco, CA, United States
- Founded
- 2024
- Website
- 21st.dev/
- Ownership
- Privately Held (backing)
21st 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 21st 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 21st in its N-PORT filings yet. We sweep new filings monthly.