J2 Ventures has closed its $250 million Brookhaven Fund, an oversubscribed early-stage investment vehicle focused on dual-use technologies critical to both U.S. national security and commercial markets.
The Boston-based venture capital firm said the fund includes JP Morgan, MetLife, Upsher Management, Alpha Leonis Partners and the State Investment Council of New Mexico as limited partners.
What Is the Brookhaven Fund’s Focus?
The Brookhaven Fund will target companies developing advanced computing, cybersecurity, communications and artificial intelligence technologies, as well as healthcare tools that specifically relate to remote physiological monitoring. J2 said the fund aims to help founders scale technologies that strengthen national resilience while achieving commercial viability.
“Brookhaven exists to accelerate that cycle, backing founders whose innovations strengthen not only national security but the everyday systems that keep society safer, healthier, and more connected,” said Alex Harstrick, managing partner and co-founder of J2 Ventures.
Who Is Behind J2 Ventures?
Led by veterans, scientists and entrepreneurs, J2 Ventures invests in technologies aligned with U.S. government and defense priorities. The firm has backed more than 35 startups through its previous funds, supporting companies such as Oura, Aalyria, Codemetal, Apex Space and Mesa Quantum.
The firm’s leadership includes Harstrick, managing partner Jonathan Bronson, and general partners Matt Goldman, a retired Air Force colonel and former chief medical officer at the Defense Innovation Unit; Christine Keung, former chief data officer for San Jose, California; and retired Navy SEAL Master Chief Adam Briley.
“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,” said Bronson.
How Does Brookhaven Fund Build on Previous Funds?
Brookhaven follows J2’s $150 million Argonne Fund raised in 2024 and its $68 million inaugural fund in 2021. According to J2, the firm’s portfolio companies have collectively raised an average of $2 in non-dilutive government funding for every $1 invested by the firm.
Brookhaven is J2’s third consecutive oversubscribed fund, which the firm said reflects continued confidence in its performance and dual-use investment model.
