Investor profile
Fine Structure Ventures
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Fine Structure Ventures takes a first-principles approach to investing in disruptive scientific and technological innovation, backing teams they believe are best positioned to deploy revolutionary technologies from lab to global scale. Named for the fine-structure constant in physics—the single best-predicted constant in all of physics—the firm seeks "unprecedented accuracy" in evaluating opportunities that, if realized at scale, would have "obvious, dramatic, global impact." Affiliated with FMR LLC (Fidelity Investments) and operating as an F-Prime fund since July 2024, FSV invests across the full company lifecycle from pre-seed to pre-IPO, maintaining board representation at over 80% of portfolio companies across aerospace, biology, computing, energy, and materials sectors globally.
Notable quotes
“There's a disconnect right now between U.S. investor sentiment and what's actually happening in markets. Demand is accelerating, and companies with real products and established customers is one of the keys to revenue.”
“We are delighted to be working closely with Sepion after leading their Series A round in October 2021 to get their batteries on the road and in the skies by 2025.”
Recent investments
| Company | Round | Size | Date |
|---|---|---|---|
| pH7 Technologies | Series B | $6m | 2026-03-31 |
| Sepion Technologies | Series B | $10m | 2026-03-26 |
| Aalo Atomics | Series B | $100m | 2025 |
| Commonwealth Fusion Systems | Seed | — | 2020 |
| Boston Metal | Series A | — | 2020 |
| Mainspring Energy | Series A | — | 2020 |
| Ambient Photonics | Series A | — | 2023 |
| Caelux | Series A | — | 2023 |
| Constructive Bio | Seed | — | 2024 |
| FemtoAI | Seed | — | 2022 |
Frequent co-investors
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