First In – Startup Investor Profile

First In is a VC firm investing in security technologies focused on cybersecurity, dual-use/defense tech, and data intelligence

Location: Washington

Country:

Investment Regions:

Investment Stages: pre-seed, seed, series-a

Website: https://wearefirstin.com/

AI Reasoning: Search of First In’s site and news shows First In participated in Antithesis seed funding reported Feb 13, 2024 and other investments including Phylum and Shift5 with press items through 2025. The most recent explicit investment-related public mention tied to First In on their news page is Antithesis (invested Feb 13, 2024). Calculating from that date to the target reference date places the last known investment within 21 months; however, the site includes investments and news dated in 2025 such as Antithesis dated 14 February 2025 and multiple January-March 2025 press items (e.g., Castelion Jan 29, 2025; Precog Jan 21, 2025; Phylum and others). The latest identified deal referencing First In is Antithesis on 14 Feb 2025, which is under 9 months before the reference date, fitting the ‘active’ window (between 6 and 3 months would be incorrect because Feb 14, 2025 to Nov 1, 2025 is ~8.5 months; that falls between 12 and 6 months -> low-active). But multiple 2025 items indicate activity in Jan-Mar 2025; the latest clearly tied to First In is Mar 2025 (Shift5 Fast Company March 19, 2024 note is older). Given evidence of a Feb 14, 2025 investment in Antithesis (~8.5 months prior), classification is ‘low-active’. However, considering additional press showing activity into March 2025 (Precog Jan 21, 2025 and other items through March 2025), the most conservative, supported tag is ‘low-active’.

Not Active – No known investments in the last 12 months.

Low Activity – Only known investments between the last 12 and 6 months.

Active – Known investments between the last 6 and 3 months.

Very Active – Known investments in the last 3 months.