Climate & EnergyAIBiotech & Life SciencesHardware & SemiconductorsHealthcareInfrastructure & CloudManufacturing
The Engine is a venture capital firm that invests in early-stage "tough tech" companies, focusing on deep scientific and engineering breakthroughs that address significant global challenges. Their strategy involves providing not only capital but also specialized infrastructure, expertise, and a supportive community to help these companies navigate the long development cycles inherent in their fields.
37% of their portfolio is in Climate & Energy. Deal activity increased 200% year-over-year (9 deals in the last 12 months). Average disclosed round size is $51.8M (across 34 rounds with reported amounts).
Portfolio
35
Fund Size
$1B
Top Stage
Series A
Last 12 Mo
9
Team
RS
Reed Sturtevant
General Partner
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
35 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Sora Fuel | Series A | $14.6M | Apr 2026 |
 AtmosZero | Unknown | — | Mar 2026 |
| AAxiomatic AI | Seed | $18M | Mar 2026 |
 DG Matrix | Series A | $60M | Feb 2026 |
| TTrener Robotics | Series A | $32M | Feb 2026 |
 Bexorg, Inc. | Series A | $23M | Oct 2025 |
 Genomines | Series A | $45M | Sep 2025 |
 Commonwealth Fusion Systems | Series B | $863M | Aug 2025 |
 Finwave Semiconductor | Bridge | $8.2M | May 2025 |
 TimeFlow | Seed | $4M | Feb 2025 |
| PPredicta Biosciences | Seed | $5.2M | Jul 2024 |
| ZZefi.ai | Pre-Seed | $1.6M | May 2024 |
 DBOS, Inc. | Seed | $8.5M | Mar 2024 |
| GGuidoio | Pre-Seed | $700K | Feb 2024 |
 Osmoses | Seed | $11M | Oct 2023 |
 Syzygy Plasmonics | Series C | $76M | Nov 2022 |
| AAxoft | Seed | $8M | Oct 2022 |
 Atlantic Quantum | Seed | $9M | Jul 2022 |
 Foundation Alloy | Series A | $10.5M | May 2022 |
 Resonant Link | Seed | $9.3M | Feb 2022 |
| VVia Separations | Series B | $38M | Oct 2021 |
 The Routing Company | Seed | $5M | Dec 2020 |
| WWoHo | Seed | $4.5M | Oct 2020 |
| Commonwealth Fusion Systems | Series A | $84M | May 2020 |
| Commonwealth Fusion Systems | Series C | $84M | May 2020 |
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Top Co-Investors
Safar Partners7 shared
Breakthrough Energy Ventures5 shared
Khosla Ventures4 shared
Prelude Ventures3 shared
Fine Structure Ventures3 shared
Lowercarbon Capital3 shared
Equinor3 shared
Future Fund3 shared
Moore Strategic Ventures3 shared
Schooner Capital3 shared
Starlight Ventures3 shared
360 Capital2 shared
Temasek Holdings2 shared
Devonshire Investors2 shared
Eni Next2 shared
Chevron Technology Ventures2 shared
AccelR81 shared
Refactor Capital1 shared
Closed Loop Partners1 shared
Embark Ventures1 shared
Last updated: 15 April 2026