Boston-based venture capital firm J2 Ventures has officially closed its latest fund, the Brookhaven Fund, at $250 million.
The firm focuses on investing in companies that advance both commercial technology and U.S. national security.
With this latest fund, J2 Ventures is setting its sights on the next wave of transformative technologies.
High-Profile Investors Back the Fund
Brookhaven’s backers include some of the biggest names in finance and institutional investment.
LPs supporting the fund are JP Morgan, MetLife, Upsher Management, Alpha Leonis Partners, and the State Investment Council of New Mexico, alongside several family offices. This diverse investor base reflects strong confidence in J2 Ventures’ strategy and track record.
Focus on Early-Stage Innovation
The Brookhaven Fund will concentrate on early-stage companies developing technologies critical to the future of health, infrastructure, and security. Areas of particular focus include:
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Advanced Computing
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Cybersecurity
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Communications Infrastructure
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Artificial Intelligence
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Healthcare, with a focus on remote physiological monitoring
J2 Ventures aims to back startups that can make a tangible impact both commercially and for U.S. national security interests.
A Proven Track Record of Success
This is not J2 Ventures’ first rodeo. Across its first two funds, the firm invested in more than 35 companies pushing the boundaries in health, infrastructure, and security.
Collectively, these portfolio companies have raised over $1 billion in follow-on funding and secured hundreds of millions in non-dilutive government grants.
Notable portfolio companies include Oura, Aalyria, Codemetal, Apex Space, and Mesa Quantum, each of which represents a breakthrough in their respective field.
Leadership With Deep Expertise
J2 Ventures’ leadership team brings a unique mix of commercial, technical, and government experience. The firm is led by Managing Partners Alex Harstrick and Jonathan Bronson, PhD, and supported by General Partners:
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Dr. Matt Goldman – former Chief Medical Officer at the Defense Innovation Unit and retired Air Force Colonel
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Christine Keung – former Chief Data Officer for San Jose and political appointee at the Small Business Administration
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Master Chief (ret.) Adam Briley – Navy SEAL veteran leading Federal Programs initiatives
This combination of venture, defense, and government expertise positions J2 Ventures to identify and support companies with both commercial potential and strategic importance.
Looking Ahead
With the Brookhaven Fund now closed, J2 Ventures is ready to accelerate its mission of backing transformative technologies that matter.
Investors, entrepreneurs, and the broader tech ecosystem will be watching closely as the firm deploys capital into startups that could redefine healthcare, cybersecurity, and national security capabilities.