Neil Sirni
Solo GP · New York, NY
Neil Sirni is a solo GP based in New York, NY focused on Healthcare, investing at pre-seed, seed stage. Neil Sirni's most recent fund with a disclosed size, Proximity Exploration I, LLC, filed a $11.3M offering with the SEC in Oct 2025. Neil Sirni has 4 funds and deal vehicles on SEC file, including 1 single-deal SPVs. Estimated typical check: $125K–$350K. Neil Sirni has dated investing activity in the last 12 months (latest Oct 2025).
Why Neil Sirni is listed
Named as the only individual (Managing Member of the Managing Member) on the Form D for Proximity Exploration I, LLC, a $11.3M venture fund (Oct 2025) (4 vehicles on file: 3 funds, 1 SPV).
Source: SEC Form D: Proximity Exploration I, LLC (Oct 28, 2025) · 3 more sources
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- Stages
- Pre-seed, Seed
- Typical check (est.)
- $125K–$350K
- Latest fund
- $11.3M · Oct 2025
- Latest dated activity
- Oct 2025
Is Neil Sirni a fit for you?
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What does Neil Sirni invest in?
HealthcareWhat has Neil Sirni invested in recently?
Funds and deal vehicles Neil Sirni filed with the SEC
Sources
- SEC Form D: Proximity Exploration I, LLCOct 28, 2025
- SEC Form D: Proximity Health I, LLCOct 31, 2024
- SEC Form D: Proximity Fifth Down I, LLCJul 29, 2024
- SEC Form D: Proximity Mack Ventures, LLCDec 13, 2023
Data refreshed from public sources Oct 15, 2026. Is this you? Remove or correct this profile.