First In is an early-stage venture capital firm focused exclusively on security technology, investing in cybersecurity, defense, and data companies. The firm is led by former Marine Corps officers, CIA operatives, and defense-tech operators who apply military systems thinking to venture investing.
Deal activity increased 200% year-over-year (12 deals in the last 12 months). Their most common stage is seed (44% of deals). Average disclosed round size is $36.2M (across 49 rounds with reported amounts).
Portfolio
36
Fund Size
$148M
Top Stage
Seed
Last 12 Mo
12
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
52 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Smack | Series B | $61M | Aug 2026 |
 Volund Manufacturing | Seed | $12M | Jun 2026 |
 Cloneable | Seed | $4.6M | Apr 2026 |
 Rilian | Seed | $17.5M | Apr 2026 |
 Scatr | Series A | $12.6M | Apr 2026 |
 Hybron | Seed | $25M | Apr 2026 |
| Smack | Seed | — | Mar 2026 |
| Volund Manufacturing | Seed | $12M | Jan 2026 |
| Smack | Series A | $32M | Jan 2026 |
 AnySignal | Series A | $24M | Dec 2025 |
 Antithesis | Series A | $105M | Dec 2025 |
 Onfire | Series A | $20M | Oct 2025 |
 ViCentra | Series D | $85M | Sep 2025 |
 Tidal Cyber | Series A | $10M | Sep 2025 |
 Castelion | Series B | $350M | Jul 2025 |
 Classiq | Series C | $110M | May 2025 |
 BRIA | Series B | $40M | Mar 2025 |
| Castelion | Series A | $70M | Jan 2025 |
| Volund Manufacturing | Pre-Seed | — | Jan 2025 |
 ZeroTier | Series A | $13.5M | Jul 2024 |
 Confetti | Series A | $16M | Mar 2024 |
 Dapple Security | Pre-Seed | $2.3M | Feb 2024 |
| Antithesis | Seed | $47M | Feb 2024 |
| Dapple Security | Pre-Seed | $2.3M | Jan 2024 |
| ZeroTier | Unknown | $13.5M | Jan 2024 |
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Top Co-Investors
BlueYard Capital6 shared
Tamarack Global4 shared
Wing Venture Capital4 shared
Entrée Capital4 shared
Fall Line Capital4 shared
Techstars4 shared
GG14 shared
Grantham Foundation3 shared
RA Capital Management3 shared
FTW Ventures3 shared
Lavrock Ventures3 shared
Washington Harbour Partners3 shared
Marlinspike3 shared
Boost VC3 shared
Costanoa Ventures3 shared
Fortitude Ventures3 shared
Geodesic Capital3 shared
Scribble Ventures3 shared
Bloomberg Beta3 shared
Felicis3 shared
Last updated: 7 October 2026