Organization · Venture Capital
MCJ
MCJ is a Boston-based venture capital firm focused on early-stage investments in climate technology startups. It supports over 80 companies aiming to enhance resilience against climate change through innovative solutions.
Overview
What MCJ does
What MCJ is
MCJ is a Boston-based venture capital firm focused on early-stage investments in climate technology startups. It supports over 80 companies aiming to enhance resilience against climate change through innovative solutions.
How it participates in the startup ecosystem
The current public profile supports funder and community capabilities. Each capability below is shown separately so organization identity and role-specific information do not get conflated.
Operational profile
Organization status and context
Organization status describes the entity itself. Funding and program availability appear within the relevant capability profile.
- Operational status
- Active
- Organization type
- Venture Capital
- Founded
- Founded in 2019
- Approximate age
- About 7 years
- Structured capabilities
- Funder · Community
- Last reviewed
- May 5, 2026
Official channels
Find MCJ elsewhere
Open the official website or a supported primary organization account.
Capability profile
MCJ as a funder
Investment thesis
MCJ backs extraordinary founders rewriting industries to be cleaner, more profitable, and more resilient, focusing on the energy transition and climate resilience.
Focus narrative
MCJ invests in startups that are transforming industries to be more sustainable and resilient in the face of climate change. The firm focuses on early-stage climate technology ventures, particularly in the energy transition and climate resilience sectors, supporting companies that are innovating to mitigate the impacts of climate change.
Value beyond capital
MCJ adds value to its portfolio companies through a robust community of climate professionals, facilitating connections and talent acquisition. The firm hosts over 100 events annually and provides access to a network that has facilitated 600+ introductions and 50+ hires. Additionally, MCJ produces the 'Inevitable' podcast and a weekly newsletter, enhancing its reach and influence in the climate tech space.
Terms and economics
- Typical check
- $500,000–$5,000,000
- Sweet spot
- $500,000
Focus and fit
- Stages
- Pre-seed · Seed · Series A
- Regions
- Global · North America
Availability
- Currently deploying
- Yes
Portfolio and track record
- Recorded portfolio count
- 80
- Recorded notable exits
- Arcadia and Crusoe
Portfolio context
Notable portfolio companies include: Arcadia: A unicorn enabling clean energy access through data infrastructure. Crusoe: A unicorn utilizing stranded natural gas and renewable energy for AI cloud computing. Moment Energy: Focused on second-life EV battery repurposing, building the first dedicated gigafactory in the US. The Nuclear Company: Developing fleet-scale nuclear power solutions to meet industrial power demands.
Capability profile
MCJ as a community
Community overview
MCJ is an organization dedicated to addressing climate change by supporting founders innovating across various industries. Founded in 2019, MCJ has evolved from a podcast and member community into a global network of over 3,500 members across more than 50 countries. The organization focuses on fostering a community committed to climate action and facilitating connections among climate professionals.
Community focus
MCJ invests in startups that are transforming industries to be cleaner, more profitable, and more resilient. The organization emphasizes the importance of adapting to a rapidly changing business landscape and supports ventures specifically within the climate tech sector, including energy transition and climate resilience.
Member value
Members of MCJ benefit from access to a vast network of climate professionals, opportunities for collaboration, and resources for navigating the climate tech landscape. The community serves as a deal sourcing channel and talent pipeline, facilitating introductions and hires within the network. Members also receive insights through the 'Inevitable' podcast and a weekly newsletter.
Membership
- Recorded members
- 3,500
- Pricing models
- free
Format and cadence
- Modality
- hybrid
- Schedule
- rolling-admissions
- Commitment
- light
Availability
- Membership state
- Accepting
Audience and fit
- Audience
- Founders · Investors · Builders
- Benefits
- network-access and mentorship
- Program types
- community
- Selection criteria
- open
- Stages
- Pre-seed · Seed · Series A
- Regions
- Global
Community activity
- Annual events
- 100
Events and activity
MCJ hosts over 100 events annually, providing members with opportunities to connect, learn, and collaborate on climate-related initiatives. These events include networking gatherings, educational sessions, and discussions focused on climate innovation and entrepreneurship.
Notable members
Notable members of MCJ include Jason Jacobs, the founder and venture partner, and Cody Simms, managing partner. The organization has also built a portfolio that includes unicorns like Arcadia and Crusoe, showcasing its influence in the climate tech sector.
Common questions
What to know about MCJ
Upseed classifies MCJ under the Venture Capital organization type. Its current public profile includes funder and community capabilities.
Source and update disclosure
Know what this page is based on
Source basis
Public organization and program material, official websites, and structured Upseed records.
Last reviewed
May 5, 2026
Known limits
Capability profiles appear only when a structured public profile also contains decision-useful role evidence. Terms and availability can change.
Upseed is an independent guide. It is not affiliated with or endorsed by the organization described on this page.