# MCJ

> MCJ is a VC fund in Boston backing Renewable Energy and Energy. See 81 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: VC Fund
- Location: Boston, United States
- Total investments: 81
- Last investment: Sep 2025
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/mcjcollective/
- X (Twitter): https://twitter.com/mcjcollective
- Website: https://www.myclimatejourney.co/mcj-collective
- Facebook: https://www.facebook.com/myclimatejourney/

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

## Contacts

5 contacts available for MCJ. Shizune tracks 3 team members at MCJ. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-team-emails/my-climate-journey-collective?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $2.6M–$11M |
| Series A | $8M–$35M |
| Series B | $24M–$150M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Renewable Energy | 18 | 22% |
| Energy | 14 | 17% |
| Software | 13 | 16% |
| Sustainability | 11 | 14% |
| Artificial Intelligence | 7 | 9% |

102 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 34 | 42% |
| Series A | 26 | 32% |
| Series B | 8 | 10% |
| Pre-Seed | 4 | 5% |
| Series C | 3 | 4% |

8 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 52 | 64% |
| United Kingdom | 3 | 4% |
| Kenya | 1 | 1% |
| Canada | 1 | 1% |
| Norway | 1 | 1% |

8 countries tracked in total.

## Team

| Name | Title | Investments | Profile |
| --- | --- | --- | --- |
| Cody Simms | Managing Partner | 15 | https://shizune.co/investors/profile/cody-simms |
| Jason Jacob | Founder | 0 | https://shizune.co/investors/profile/jason-jacob-6731 |
| Jason Jacobs | Partner | 2 | https://shizune.co/investors/profile/jason-jacobs |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Euclid Power | 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 | 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 | LGND is a technology business that specialises in AI-powered spatial data solutions. | $9M | Seed | Jul 10, 2025 |  |
| Rhizome | 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 | The Nuclear Company is a fleet-scale nuclear deployment firm that offers for nuclear sectors. | $46.3M | Series A | May 15, 2025 |  |
| Exowatt | Modular Full-Stack Renewable Energy Solutions for Commercial and Industrial Applications | $35M | Series A | Apr 22, 2025 |  |
| Fourier | 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 Energy | 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 | 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 | Zeno is a climate conscious motor company that offers eco-friendly motorcycles. | $9.5M | Seed | Sep 19, 2024 |  |

10 of 81 investments shown.

## Co-investors
- [MCJ](https://shizune.co/investors/profile/mcj) — VC Fund, 77 deals together
- [MCJ](https://shizune.co/investors/profile/mcj-collective) — VC Fund, 74 deals together
- [Lowercarbon Capital](https://shizune.co/investors/profile/lowercarbon-capital) — VC Fund, 27 deals together
- [Climate Capital](https://shizune.co/investors/profile/climate-capital) — VC Fund, 16 deals together
- [Breakthrough Energy Ventures](https://shizune.co/investors/profile/breakthrough-energy-ventures) — VC Fund, 12 deals together
- [Congruent Ventures](https://shizune.co/investors/profile/congruent-ventures) — VC Fund, 10 deals together

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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 Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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