
J2 Ventures focuses on early‑stage deep‑technology companies that address national‑security‑critical problems, including AI, biomedical breakthroughs, cybersecurity, and critical infrastructure. The firm partners with founders to provide capital, government‑sector expertise, and a robust network that helps navigate public‑sector challenges. By investing primarily in Seed and Series A rounds, J2 aims to accelerate breakthrough innovations that serve both commercial markets and U.S. defense needs.
Industries
Industry breakdown
Top industries in the portfolio
Geography
Geographic scope
United States
Geography breakdown
Darker regions = more portfolio companies
Top 5 countries
United States of America
70.0%Cuba
3.3%Finland
3.3%United Kingdom
3.3%Ireland
3.3%Other
3.3%Countries with a higher share of the portfolio are shaded darker on the map.
Stages
Stage indicator
Seed → Series A
Stage breakdown
Portfolio by stage
Portfolio vintage
Companies by founded year
Fund details
Funds
Fund II
Vintage 2024 • $150M
Brookhaven Fund
Vintage 2025 • $250M