Gregory Mazlin
Solo GP · New York, NY
Gregory Mazlin is a solo GP based in New York, NY, investing at seed, series a stage. Gregory Mazlin's most recent fund with a disclosed size, Sideline Group Fund I, L.P., filed a $139M offering with the SEC in Mar 2026. Gregory Mazlin has 3 funds and deal vehicles on SEC file, including 2 single-deal SPVs. Estimated typical check: $1.4M–$4.2M. Gregory Mazlin has dated investing activity in the last 12 months (latest Mar 2026).
Why Gregory Mazlin is listed
Named as the only individual (The Managing Member of the General Partner) on the Form D for Sideline Group Fund I, L.P., a $139.4M venture fund (Mar 2026) (3 vehicles on file: 1 fund, 2 SPVs).
Source: SEC Form D: Sideline Group Fund I, L.P. (Mar 24, 2026) · 2 more sources
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- Stages
- Seed, Series A
- Typical check (est.)
- $1.4M–$4.2M
- Latest fund
- $139M · Mar 2026
- Latest dated activity
- Mar 2026
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What does Gregory Mazlin invest in?
Sector focus not yet verifiedWhat has Gregory Mazlin invested in recently?
- Dec 2024
Sideline Group Fund I, L.P.
Invested through a fund
Funds and deal vehicles Gregory Mazlin filed with the SEC
Sources
- SEC Form D: Sideline Group Fund I, L.P.Mar 24, 2026
- SEC Form D: Sideline Group Urban Golf SPV, L.P.Jun 10, 2025
- SEC Form D: Sideline Group Bandit SPV, L.P.Dec 17, 2024
Data refreshed from public sources Oct 15, 2026. Is this you? Remove or correct this profile.