MCJ is a venture capital firm. Based in Boston, Massachusetts, United States. Among the 10 companies in the known portfolio are Crusoe, Aalo Atomics, Overstory, DG Matrix, Euclid Power and Hammerhead AI.
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Investment focus
Who to pitch at MCJ
MCJ portfolio companies (10)
- Crusoe
- Aalo Atomics
- Overstory
- DG Matrix
- Euclid Power
- Hammerhead AI
- Rodatherm Energy
- Telo Trucks
- Archimetis
- Unlimited Industries
Co-investors
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About MCJ
The firm's listing covers sectors AI, Climate and Hardware, and focus areas Battery, Clean Energy, EV and Machine Learning; known deals cluster at Growth, Seed and Series A.
The team counts 4 people in our database. Cody Simms (Managing Partner), Jason Jacobs (Founder & Venture Partner) and David Aronoff (Chairman & Managing Partner) are shown as the contacts to pitch.
MCJ shares portfolio companies with 20 other investment firms, among them Fine Structure Ventures, Fifty Years and Perpetual.
Frequently asked questions
What is MCJ?
MCJ is a venture capital firm based in Boston, Massachusetts, United States, with a known portfolio of 10 companies. The portfolio comes from public investment records rather than from the firm, so deals that never surfaced publicly are not in it.
What does MCJ invest in?
Listed sectors include AI, Climate and Hardware; listed focus areas include Battery, Clean Energy, EV and Machine Learning. Those tags come from the portfolio attached to the firm, so they describe what has been backed rather than a stated mandate for what comes next.
What stage does MCJ invest at?
The known deals of MCJ include Growth, Seed and Series A rounds. Check that against your own round before reaching out: stage mismatch is the most common reason a well matched sector still goes nowhere.
Who should I pitch at MCJ?
3 of the 4 people on file at MCJ are listed as contacts for the firm. All 4 have their own profile page.
How do I contact MCJ?
Any email address on file for the firm is masked on this page and readable inside RaiseHunt after you create an account. The 4 people attached to the firm have their own pages, each showing whether an address is on file for them.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal