J2 Ventures is a Boston-based deep-tech venture capital firm focused on dual-use technologies critical to U.S. national security and commercial markets. The firm invests in early-stage companies across advanced computing, biomedical engineering, cybersecurity, and infrastructure, with a team led by U.S. military veterans.
Deal activity decreased year-over-year (6 deals in the last 12 months vs 9 prior). Their most common stage is seed (45% of deals). Average disclosed round size is $30.8M (across 58 rounds with reported amounts).
Portfolio
52
Fund Size
$250M
Top Stage
Seed
Last 12 Mo
6
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
65 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Sazabi | Seed | $8M | Jun 2026 |
 Flashpass | Seed | $4.1M | Apr 2026 |
 aalyria | Series B | $100M | Feb 2026 |
 SkyFi | Series A | $12.7M | Jan 2026 |
 Principal Mineral | Growth | $280M | Jan 2026 |
 InfiniG | Seed | $5.2M | Jan 2026 |
 Flashpass Education | Seed | $4.3M | Jan 2026 |
 VectorWave | Seed | $6M | Jan 2026 |
 Lumia | Seed | $18M | Dec 2025 |
 Code Metal | Series A | $36.5M | Nov 2025 |
 Unit 221B | Seed | $5M | Sep 2025 |
 DataCrunch | Series C | — | Sep 2025 |
 Phoenix Semiconductor | Seed | $5.5M | Jun 2025 |
| VectorWave | Seed | $2.5M | Jun 2025 |
 Lightsource | Unknown | $33M | Apr 2025 |
 Systole Health | Pre-Seed | $2M | Jan 2025 |
| Lightsource | Series B | $33M | Jan 2025 |
 Gamebeast | Pre-Seed | $3.7M | Jan 2025 |
| Phoenix Semiconductor | Seed | $5.5M | Jan 2025 |
| DDruid Software | Growth | $20M | Jan 2025 |
 Concentro | Seed | $3M | Dec 2024 |
 Parallel Fluidics | Seed | $7M | Nov 2024 |
| DataCrunch | Seed | $13M | Oct 2024 |
| MMesa Quantum | Seed | $3.8M | Sep 2024 |
 OnRamp | Series A | $14.2M | Jul 2024 |
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Top Co-Investors
J-Ventures7 shared
Lightspeed Venture Partners4 shared
Founders Fund4 shared
Plug and Play Tech Center4 shared
Gaingels4 shared
Y Combinator3 shared
Battery Ventures3 shared
8VC3 shared
Shield Capital3 shared
IronGate Capital Advisors3 shared
FJ Labs3 shared
General Catalyst2 shared
Rebel Fund2 shared
Unusual Ventures2 shared
Felicis2 shared
Nexus Venture Partners2 shared
468 Capital2 shared
Redpoint Ventures2 shared
GSBackers2 shared
Mirae Asset2 shared
Last updated: 20 October 2026