Alex Rosenberg
Solo GP · Los Angeles, CA
Alex Rosenberg is a solo GP based in Los Angeles, CA, investing at pre-seed, seed stage. Alex Rosenberg's most recent fund with a disclosed size, Main Character Fund I, LP, filed a $25M offering with the SEC in Mar 2025. Estimated typical check: $250K–$750K. Alex Rosenberg's latest dated investing activity was in Mar 2025.
Why Alex Rosenberg is listed
Named as the only individual (Manager of the General Partner of the Issuer) on the Form D for Main Character Fund I, LP, a $25M venture fund (Mar 2025).
Source: SEC Form D: Main Character Fund I, LP (Mar 31, 2025)
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- Stages
- Pre-seed, Seed
- Typical check (est.)
- $250K–$750K
- Latest fund
- $25M · Mar 2025
- Latest dated activity
- Mar 2025
Is Alex Rosenberg a fit for you?
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What does Alex Rosenberg invest in?
Sector focus not yet verifiedWhat has Alex Rosenberg invested in recently?
- Mar 2025
Main Character Fund I, LP
Invested through a fund
Funds and deal vehicles Alex Rosenberg filed with the SEC
- Mar 2025
Main Character Fund I, LP
Fund · $25M offering
Sources
- SEC Form D: Main Character Fund I, LPMar 31, 2025
Data refreshed from public sources Oct 15, 2026. Is this you? Remove or correct this profile.