Engine Ventures
About Engine Ventures
Engine Ventures is a venture capital firm based in Cambridge, Massachusetts, focused on investing in "Tough Tech" founders who are developing innovative technologies to tackle major global challenges in climate change, human health, and advanced systems. Established in 2016 as part of MIT’s nonprofit incubator, The Engine, it became a standalone firm in 2023, led by CEO Katie Rae and President Israel Ruiz. The firm manages over $1.1 billion in assets, including its recently closed $398 million Fund III.
Engine Ventures supports early-stage companies by providing capital, operational expertise
The firm launched in 2016 as The Engine, built by MIT. Its funds have grown over time. Fund II raised $250M in 2020, with Harvard as a limited partner, and in June 2024 the firm announced a $398M Fund III, its largest to date. At that point it said it had backed 56 companies. Fund III was the first under the Engine Ventures brand. Katie Rae is Managing Partner and CEO. Israel Ruiz, named as President in the existing profile, is listed as a lead investor on the Axiomatic AI seed round. Ann DeWitt is listed as a General Partner on a third-party fund directory. The firm has not published a separate AI team or an AI-specific fund.
Engine Ventures does not run a separate AI strategy. It invests in Tough Tech across climate, human health and advanced systems, and its AI deals fall inside those areas. Two patterns show up in recent rounds. One is AI applied to engineering and science work. In March 2026 the firm led an $18M seed round in Axiomatic AI, which builds verified AI for science and engineering and is aimed first at photonics and semiconductors. The other is the physical infrastructure behind AI. VEIR makes superconducting power delivery systems for AI data centers. Engine Ventures is a returning investor in its $110M Series C, announced in October 2026. The firm also lists Celestial AI as a portfolio company. Founders should expect a hands-on investor. The firm says it works with founders from the first check, takes board seats, and offers operational help and access to academic, commercial and government networks.
Public descriptions say the firm invests globally from pre-incorporation through seed and early market, and some directories also list Series A. Engine Ventures has not published a standard check size or ownership target, so none is given here. Its AI rounds show a range of roles. It led Axiomatic AI's $18M seed round, where the round size is the total raise and not Engine's own check. It also took part as an existing investor in VEIR's Series C.
- Axiomatic AI: verified AI for science and engineering, starting with photonics and semiconductors. Engine Ventures led its $18M seed round in March 2026.
- VEIR: superconducting power delivery systems for AI data centers. Engine Ventures is an existing investor and took part in the $110M Series C in October 2026.
- Celestial AI: an Engine Ventures portfolio company that the firm said closed a $175M Series C led by US Innovative Technology. Tracxn lists it as acquired.
- businesswire.com/news/home/20240618546662/en/Translating-Breakthroughs
- privateequitywire.co.uk/mits-vc-firm-raises-398m-for-third-fund-backin
- findfunding.vc/the-engine
- builtinboston.com/articles/axiomatic-ai-raises-18m-seed-round-20260309
- techfundingnews.com/axiomatic-ai-18m-seed-verified-engineering
- startupintros.com/news/2026-03-26-axiomatic-seed
- citybiz.co/article/916095/veir-raises-110-million-series-c-to-scale-su
- linkedin.com/company/engine-ventures
Investing activity
Engine Ventures appears in 2 AI deals tracked by the AI Lounge deals desk, rounds totalling $128M, and led 1 of them. The rounds are mostly Series C and Seed, with a median round size of $110M. The most recent are VEIR (Series C, $110M, Oct 2026) and Axiomatic AI (Seed, $18M, Mar 2026).
Engine Ventures most often invests alongside Tyche Partners, Matter Venture Partners, LG Technology Ventures and Galvanize Climate Solutions, and the companies it backs on AI Lounge are mostly in AI data center power infrastructure and AI.
Deals
Frequently asked questions about Engine Ventures
Does Engine Ventures invest in AI startups?
Yes, but within its Tough Tech focus. Recent examples are the lead of Axiomatic AI's $18M seed round in March 2026 and its participation in VEIR's $110M Series C for AI data center power in October 2026.
What stage does Engine Ventures invest at?
The firm describes itself as investing from pre-incorporation through seed and early market. Some directories also list Series A. It backed Axiomatic AI at seed and joined VEIR's Series C as an existing investor.
What is Engine Ventures' typical check size?
The firm has not published a check size. Third-party figures are estimates, so confirm with the team directly.
How big is Engine Ventures' latest fund?
Fund III closed in June 2024 at $398M. It follows a $250M fund raised in 2020.
Who founded Engine Ventures and who leads it?
It launched in 2016 as The Engine, built by MIT. Katie Rae is Managing Partner and CEO. Israel Ruiz is President and led the Axiomatic AI seed round.
What AI companies has Engine Ventures invested in?
Engine Ventures's AI investments include VEIR and Axiomatic AI. The 2 rounds on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Engine Ventures based?
Engine Ventures is based in Cambridge, Massachusetts, United States.
Who does Engine Ventures co-invest with?
Engine Ventures's most frequent co-investors on AI Lounge are Tyche Partners (1 deal), Matter Venture Partners (1 deal), LG Technology Ventures (1 deal), Galvanize Climate Solutions (1 deal) and Congruent Ventures (1 deal).
How can founders reach Engine Ventures?
Founders on AI Lounge can see Engine Ventures's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Engine Ventures to their Investor Pipeline to track the conversation.