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J2 Ventures is an early-stage venture capital firm that invests in companies developing "dual-use" technologies in advanced computing, biomedical engineering, cybersecurity, and infrastructure. Their strategy focuses on innovations that serve both commercial markets and U.S. national security interests, typically investing in Seed and Series A rounds.
Deal activity decreased year-over-year (4 deals in the last 12 months vs 10 prior). Their most common stage is seed (43% of deals). Average disclosed round size is $28.9M (across 44 rounds with reported amounts).
Portfolio
44
Fund Size
$468M
Top Stage
Seed
Last 12 Mo
4
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
44 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Lumia | Series A | $7M | Nov 2025 |
 Code Metal | Series A | $36.5M | Nov 2025 |
| UUnit 221B | Seed | $5M | Sep 2025 |
| DDataCrunch | Series A | $55M | Sep 2025 |
 Systole Health | Pre-Seed | $2M | Jan 2025 |
 Concentro | Seed | $3M | Dec 2024 |
 Parallel Fluidics | Seed | $7M | Nov 2024 |
| DDataCrunch | Seed | $13M | Oct 2024 |
| MMesa Quantum | Seed | $3.8M | Sep 2024 |
 OnRamp | Series A | $14.2M | Jul 2024 |
 Apex | Series B | $95M | Jun 2024 |
| Apex | Series C | $95M | Jun 2024 |
| DDema.ai | Seed | $7M | Mar 2024 |
 Dema | Seed | $7M | Mar 2024 |
| KKusari | Seed | $8M | Jan 2024 |
 Deasie | Seed | $2.9M | Oct 2023 |
 SkyFi | Seed | $7M | May 2023 |
 StellarFi | Series A | $15M | Mar 2023 |
 Andrena | Series A | $15M | Feb 2023 |
 Descope | Seed | $53M | Feb 2023 |
 Ostrom | Series A | $9.3M | Dec 2022 |
| DDema.ai | Pre-Seed | $4M | Nov 2022 |
 Eclypsium | Series B | $25M | Oct 2022 |
| FFemtosense | Series A | $8M | Sep 2022 |
 Craniometrix | Seed | $6M | Aug 2022 |
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Top Co-Investors
FJ Labs3 shared
Lightspeed Venture Partners3 shared
8VC3 shared
Shield Capital3 shared
Cedars Sinai Medical Center2 shared
ND Capital2 shared
Blue Water Life Science Advisors2 shared
byFounders2 shared
Gaingels2 shared
Daphni2 shared
Contour Venture Partners2 shared
Quiet Capital2 shared
Rebel Fund2 shared
Y Combinator2 shared
BonAngels2 shared
Unusual Ventures2 shared
Battery Ventures2 shared
XYZ Venture Capital2 shared
Upfront Ventures2 shared
Andreessen Horowitz2 shared
Last updated: 13 March 2026