J2 Ventures Raises $250 Million Brookhaven Fund to Scale Dual-Use Technology Innovations

J2 Ventures has closed its $250 million Brookhaven Fund, an oversubscribed raise that includes major institutional investors such as JP Morgan, MetLife, Upsher Management, Alpha Leonis Partners, and the State Investment Council of New Mexico.

The veteran-led venture firm focuses on technologies that serve both government and commercial markets, aiming to strengthen national resilience while driving scalable innovation.

The new fund, one of the largest early-stage vehicles dedicated to dual-use technology, will support companies developing solutions across advanced computing, cybersecurity, communications infrastructure, artificial intelligence, and healthcare, with a focus on remote physiological monitoring.

The strategy builds on J2’s success backing more than 35 companies through its previous funds, which include names like Oura, Aalyria, and Apex Space.

“There have been rocket-ship companies in every generation born out of early collaboration between national necessity and private ingenuity,” said Alex Harstrick, Managing Partner and Co-Founder of J2 Ventures. “Oracle began with a government project, Cisco and the early internet grew from federally funded research, and one of Pixar's first customers came from the public sector.”

The Brookhaven Fund arrives at a time when public and private sector collaboration in technology is intensifying. The U.S. Department of Defense recently expanded its efforts to partner with startups on artificial intelligence and quantum computing, reflecting the same urgency J2 is channeling through Brookhaven to accelerate innovation.

J2’s model leverages the experience of a team drawn from defense, science, finance, and public policy, giving the firm the ability to assess both mission-critical and commercial potential.

Its approach also helps startups access non-dilutive government funding, with portfolio companies typically raising $2 in non-dilutive capital for every $1 invested by J2.

“The most impactful innovation happens when founders are empowered with capital, insight, and access,” said Jonathan Bronson, PhD, Managing Partner and Co-Founder. “Our goal with Brookhaven is to ensure that world-changing technologies don’t get stuck on the lab bench, that they reach scale, adoption, and global impact, all while preserving value for the founder.”

Brookhaven marks J2’s third consecutive oversubscribed fund and signals continued investor confidence in the firm’s mission of bridging government needs with private sector innovation.