Engine Ventures
UnclaimedAt a Glance
- Check Size
- $. – $.
- Stage
- Pre-Seed, Seed, Series A, Series B+
- AUM
- $1.4B
- Sectors
- Aerospace & Defense, Digital Health, Other +2
- Founded
- 2016
- HQ
- Boston, MA
About Engine Ventures
Engine Ventures is a Boston, Massachusetts venture capital firm that backs Tough Tech companies: businesses tackling global challenges through breakthrough science and engineering, where the hard part is physics, chemistry and manufacturing rather than distribution. It invests from pre-seed and seed through Series A and Series B and beyond, across aerospace and defense, digital health, consumer, fintech and adjacent frontier categories, and it holds long enough for capital-intensive science to reach commercial scale.
The firm grew out of The Engine, the incubator MIT launched in 2016 to pair patient capital with specialized lab and fabrication infrastructure. Engine Ventures spun out as a separate for-profit investment firm and has been formally distinct from the nonprofit since 2023; a company can work with either without involving the other. That lineage shapes the model: deep university and national-lab sourcing, in-house research and analytics, and operating partners who have run hardware and process engineering at scale.
The portfolio is a catalogue of hard problems. Desktop Metal pushed metal additive manufacturing toward production volumes. Form Energy is building multi-day iron-air storage for the grid. Via Separations replaces thermal separation in heavy industry with membranes. Veo Robotics worked on human-robot collaboration on factory floors. Newer positions include Commonwealth Fusion Systems, Lilac Solutions in lithium extraction, Foundation Alloy in metal alloys and Bexorg in neurological research.
Engine Ventures reports roughly $1.4 billion in assets under management, and its companies have collectively raised more than $11 billion. Katie Rae, who led The Engine from its founding, is chief executive and managing partner; Israel Ruiz is president and general partner. In May 2026 the firm registered a $500 million Scale Up Fund to keep backing management teams into later rounds.
Investment Thesis
“Invests in Tough Tech companies that tackle global challenges through breakthrough science and engineering.”
Leadership Team
Katie Rae is chief executive and managing partner. She led The Engine from the day MIT created it in 2016 and carried the role into Engine Ventures when the investment firm separated from the nonprofit. Israel Ruiz is president and general partner and co-signs the firm's recent fund registrations with Rae.
The general partner bench also includes Reed Sturtevant, Ann DeWitt and Michael Kearney, with Vinny Beranek and Colleen Calhoun as partners and Dan Resnicow and David Bradwell as operating partners. Rachel Field is principal and Richard Collins is senior director of research and analytics, a function that carries weight at a firm underwriting fusion, lithium extraction and biomanufacturing risk rather than software adoption curves. Bettina Metais runs finance and operations, Jen Lichtman is general counsel, Streeter Phillips heads platform and Darby Dunn serves as executive in residence.
Sector Focus
Investment Stage
Notable Portfolio Companies
Fund History
- Engine Ventures traces to The Engine, the nonprofit incubator MIT established in 2016 under Katie Rae; the investment business later spun out as a separate for-profit firm and has been formally distinct from the nonprofit since 2023.
- Its institutional record runs through three flagship vehicles.
- Engine Fund II took first sale in March 2021 against an original $250 million target and closed $299.7 million from 66 investors.
- Engine Fund III took first sale in June 2023 against a $350 million target and closed $398.2 million from 113 investors.
- In May 2026 the firm registered Engine Ventures Scale Up Fund I at a $500 million target, signed by Katie Rae and Israel Ruiz, to hold position in maturing Tough Tech companies through later rounds.
- A parallel series of single-company vehicles, Engine Fund I SPV-A through SPV-J, has raised between $2.0 million and $25.0 million apiece since 2020.
- The firm reports roughly $1.4 billion in assets under management, and its portfolio companies have raised more than $11 billion in total.
SEC Fund Filings
- Vehicles filed, last 24 months
- 1
- Latest filing
Engine Ventures filed a Form D for 1 fund vehicle between Sep 30, 2024 and Sep 29, 2026.
| Fund vehicle | Source |
|---|---|
| Engine Ventures Scale Up Fund I, L.P. | SEC Form D, filed |
A Form D is the notice a fund files with the SEC when it raises money in a private offering. Feeder funds, parallel funds and SPVs each file their own, so the count measures filing activity, not the number of flagship funds.
Source: SEC EDGAR Form D filings for pooled investment funds, original filings only (amendments excluded). Our filing data starts Jul 1, 2024. Vehicles are matched to Engine Ventures by fund name and checked against the sponsor address and named principals on each filing; offering amounts are not shown. Each “SEC Form D” link opens an EDGAR full-text search for that vehicle’s exact name, where the filing itself is listed. See every new fund filing on the Form D Radar.
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Frequently Asked Questions
What stage does Engine Ventures invest at?
Engine Ventures primarily invests at the Pre-Seed, Seed, Series A, Series B+ stages. This means they focus on companies that are at the earliest idea or prototype phase.
Where is Engine Ventures located?
Engine Ventures is headquartered in Boston, MA. Many of their portfolio companies are also based in this region, though they invest across geographies.
What sectors does Engine Ventures focus on?
Engine Ventures focuses on investments in Aerospace & Defense, Digital Health, Other, Consumer, Fintech. Their portfolio reflects deep expertise and networks within these sectors.
What is Engine Ventures's typical check size?
Engine Ventures's typical investment check size ranges from $. to $.. Actual amounts may vary based on the stage, sector, and specific opportunity.
How much does Engine Ventures have under management?
Engine Ventures manages approximately $1.4B in assets under management (AUM) across their funds.
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