MCJ
VC Fund
Boston, United States
MCJ is a VC fund in Boston focused on Renewable Energy and Energy. MCJ backs extraordinary founders driving the transition of energy and industry and tackling the inevitable impacts of climate change. We discover and invest in startups rewriting industries to be cleaner, more profitable and more resilient. We strengthen our investments through the MCJ Collective — a vetted member network that connects talentedtech and industrial leaders with our portfolio and with one another. Our media platform including the Inevitable podcast spotlights key perspectives critical to our portfolio and the transition at large, reaching tens of thousands of professionals multiple times per week. Learn more at mcj.vc
- Total investments:
- 81
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries MCJ invests in
Stages MCJ invests in
Countries MCJ invests in
Round sizes
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Round size
- Seed
- $2.6M–$11M
- Series A
- $8M–$35M
- Series B
- $24M–$150M
Investment Focus
Industry
- Renewable Energy 18 (22%)
- Energy 14 (17%)
- Software 13 (16%)
- Sustainability 11 (14%)
- Artificial Intelligence 7 (9%)
Stage
- Seed 34 (42%)
- Series A 26 (32%)
- Series B 8 (10%)
- Pre-Seed 4 (5%)
- Series C 3 (4%)
Country
- United States 52 (64%)
- United Kingdom 3 (4%)
- Kenya 1 (1%)
- Canada 1 (1%)
- Norway 1 (1%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
Cody Simms
Managing Partner
|
Managing Partner | Total investments: 16 | Find email | |
|
Jason Jacob
Founder
|
Founder | Total investments: 0 | Find email | |
Jason Jacobs
Partner
|
Partner | Total investments: 2 | Find email |
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Euclid Power operates in the renewable energy sector, providing a comprehensive platform for project management, investment, and execution. The company offers data-driven solutions that span from project development to asset management. Euclid Power's platform is designed to simplify the process of renewable energy project development andexecution. | $20M / Series A / Sep 05, 2025 | ||
| Aalo Atomics designs and builds small nuclear fission reactors, to sell affordable and reliable clean power and heat. | $100M / Series B / Aug 19, 2025 | ||
| LGND is a technology business that specialises in AI-powered spatial data solutions. | $9M / Seed / Jul 10, 2025 | ||
| Rhizome's AI-powered climate platform helps utilities identify vulnerabilities from climate threats, quantify risk at high resolutions, and measure the benefits of grid-enhancing investments. At its core, we provide the highest standard of climate risk mitigation to ensure that communities and businesses are protected against intensifyingextreme weather events. | $6.5M / Seed / May 21, 2025 | ||
| The Nuclear Company is a fleet-scale nuclear deployment firm that offers for nuclear sectors. | $46.3M / Series A / May 15, 2025 | ||
| Modular Full-Stack Renewable Energy Solutions for Commercial and Industrial Applications | $35M / Series A / Apr 22, 2025 | ||
| Fourier is developing a modular and fully automated hydrogen production system, designed to be deployed where and when it is needed the most. This eliminates the need for hydrogen transportation. The company aims to make on-site hydrogen universally accessible, contributing to a sustainable energy future. Their innovative architecture is a keyelement in this mission. | $18.6M / Series A / Apr 02, 2025 | ||
| Moment is a start-up striving to provide greater access to renewable and reliable energy storage. We create battery units that can be used in a variety of applications. Moment is currently focused on storing energy for off-grid, end of grid customers, and plans on powering remote communities in the future. | $15M / Series A / Jan 16, 2025 | ||
| Heirloom is a provider of direct air capture technology to enhance the natural process of CO2 absorption from the atmosphere. Its technology accelerates limestone's ability to capture carbon dioxide, storing it permanently underground while operating with renewable energy. | $150M / Series B / Dec 04, 2024 | ||
| Zeno is a climate conscious motor company that offers eco-friendly motorcycles. | $9.5M / Seed / Sep 19, 2024 | ||
| See all 81 investments → | |||
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FAQ
What does MCJ invest in?
MCJ invests primarily in Renewable Energy, Energy and Software startups, most often at Seed and Series A stage. Most of the 81 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is MCJ's check size?
MCJ typically joins rounds of $2.6M–$11M at Seed, $8M–$35M at Series A and $24M–$150M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds MCJ participates in.
How do I contact MCJ?
Public channels for MCJ include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
Who are the partners at MCJ?
The team at MCJ includes Cody Simms (Managing Partner), Jason Jacob (Founder) and Jason Jacobs (Partner). The Team section lists each member with their title, investment count and links.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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