Entry stagePre-seed, Seed, Series A, Series B
Check size$100K to $250K
Leads roundsMostly follows
FocusClimate
Latest fund>$72M MCJ 2023 (2023)
Investing team5 peopleNo activity since Sep
Who you would pitch at MCJ
5 people on the investing team, 4 of them partners who can make the call. Partners are listed first.
Cody SimmsManaging PartnerHe previously held leadership and investing roles at Techstars and worked in product at several technology companies.
David AronoffChairman and Managing PartnerHe has experience in technology investing and previously held roles at Flybridge, Greylock Partners, and Bell Labs.
Thai NguyenPartnerHe previously held roles in product management and business development at Intuit and Luxe.
Yin LuPartnerFocus: investments and founder support.
Casey GoldsteinInvestmentsThey are also listed as an investor at MCJ for the Industry Growth Forum.
Work here and something is wrong? Ask for a correction.
Writes $100K to $250K checks. Its smallest check is larger than 5% of firms in the atlas.
Bars: how many firms in the atlas report each band. Highlighted: this firm.No recent activity since September 2026. Quiet does not mean closed.
Weekly count of activity updates. Activity is not a confirmed deal.Before you pitch
How to reach them[email protected]
Notable investments
SPANAalo AtomicsPacific FusionThe Nuclear CompanyExowattEuclid PowerCharge RoboticsRevoy
In their words
MCJ: We back founders rewriting industries for the future.MCJ backs extraordinary founders driving the transition of energy and industry and solving the inevitable impacts of climate change.mcj.vc
Send Mode VC your deck
Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.
Send your deckAlert me when MCJ is active
One email when this firm shows new activity. Nothing else.
Firms like MCJ
On these lists
Seed climate investors in Massachusetts19Pre-seed climate investors in Massachusetts14Series A climate investors in Massachusetts13Seed investors in United States2836Series A investors in United States1790Pre-seed investors in United States1561Series B investors in United States563Seed climate investors204
Questions
What stage does MCJ invest in?
MCJ reports entry at pre-seed, seed, series a, series b.
How much does MCJ invest?
MCJ reports checks of $100K to $250K.
Does MCJ lead rounds?
MCJ mostly follows other investors.
Who are the partners at MCJ?
Cody Simms (Managing Partner), David Aronoff (Chairman and Managing Partner), Thai Nguyen (Partner), Yin Lu (Partner).
Is MCJ active right now?
No recent activity since September 2026.
Work at MCJ? Claim or correct this profile.