Sean O'Sullivan
Investing Profile
Sweet spot: $1.5M
Range: $100K–$5M
Fund: $1.2B
Sector and stage focus
- Seed: Hardware, ClimateTech/CleanTech, BioTech, Marketplaces
- Series A: ClimateTech/CleanTech, Hardware, BioTech, Marketplaces
- general: New York City
- Pre-seed: Hardware, ClimateTech/CleanTech, BioTech, Marketplaces
Recent investments by Sean O'Sullivan
Sean O'Sullivan has 8 named past investments in the public record. The most recent:
| Company | Stage | Date | Round size |
|---|---|---|---|
| Prellis Biologics | Series C | Nov 2025 | — |
| VALANX Biotech | Series Unknown | Mar 2026 | $3M |
| DropGenie | Convertible Note | Mar 2024 | — |
| GlowDx | Convertible Note | Jun 2024 | — |
| Aequor | Seed | Jan 2024 | $200K |
| Flore by Sun Genomics | Convertible Note | Aug 2025 | — |
| MixRift | Pre Seed | Aug 2024 | $2M |
| Cell BioEngines | Pre Seed | Apr 2024 | $500K |
Frequent co-investors
Sean O'Sullivan has co-invested with: Alireza Masrour.
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