
Fine Structure Ventures is a venture capital fund affiliated with FMR LLC, the parent company of Fidelity Investments, focused on early-stage investments in disruptive scientific and technological innovation. As of July 1, 2024, F-Prime Capital advises Fine Structure Ventures. The firm is headquartered in Cambridge, Massachusetts.
Deal activity increased 33% year-over-year (4 deals in the last 12 months). Average disclosed round size is $34.5M (across 22 rounds with reported amounts).
Portfolio
23
Fund Size
—
Top Stage
Series A
Last 12 Mo
2
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
24 investments
| Company | Round | Amount | Date |
|---|---|---|---|
| Series A | $60M | Feb 2026 | |
| Series B | $25.6M | Dec 2025 | |
| Unknown | $20M | Aug 2025 | |
| Series B | $100M | Aug 2025 | |
| Bridge | $8.2M | May 2025 | |
| Series A | — | Jan 2025 | |
| Series A | $58M | Sep 2024 | |
| Seed | $6.1M | Jun 2024 | |
| Series C | $20M | Jan 2024 | |
| Seed | $11M | Oct 2023 | |
| Series A | $12M | Aug 2023 | |
| Series A | — | Oct 2022 | |
| Seed | $8M | Sep 2022 | |
| Series A | $12.2M | Jul 2022 | |
| Seed | $27.5M | Jan 2022 | |
| Seed | $5.7M | Dec 2021 | |
| Series A | $31M | — | |
| Series A | $17.8M | — | |
| Series B | $100M | — | |
| Series B | $75M | — | |
| RRadian Aerospace | Seed | $27.5M | — |
| Seed | $27.5M | — | |
| Seed | $6M | — | |
| AAalo Atomics | Series B | $100M | — |
Top Co-Investors
Gaingels8 shared
MCJ5 shared
Engine Ventures5 shared
Alumni Ventures4 shared
SpaceFund3 shared
Exor Ventures3 shared
The Venture Collective3 shared
Type One Ventures3 shared
Crosscut Ventures3 shared
Harpoon Ventures3 shared
Hitachi Ventures3 shared
Valor Equity Partners3 shared
Kindred Ventures3 shared
Tishman Speyer3 shared
Collaborative Fund2 shared
Backed VC2 shared
Helios Climate Ventures2 shared
Safar Partners2 shared
SiteGround Capital2 shared
Crescent Enterprises2 shared
Last updated: 8 September 2026