Cowboy Ventures joined Eisen’s combined $18.5M financing in May 2026 — a $10M Series A led by MissionOG plus a previously unannounced $8.5M seed led by Index Ventures — backing an AI-enabled compliance operations platform for financial services.

Key facts

• Investor: Cowboy Ventures (participant)
• Company: Eisen (AI compliance operations for financial services)
• Total raised: $18.5M ($10M Series A + $8.5M seed)
• Series A lead: MissionOG
• Seed lead: Index Ventures
• Other investors: First Round Capital, Homebrew, Restive Ventures

Why this matters

The Eisen deal is part of an active 2026 stretch for Cowboy Ventures, which also joined Basata’s $21M Series A and led Petual’s seed. The seed-stage firm, founded in 2012, has backed breakouts including Drata, Guild, and Homebase.

Sources

1. Silicon Legal Strategy — Cowboy Ventures joins Eisen’s $18.5M rounds: https://www.siliconlegal.com/sls-client-cowboy-ventures-joins-eisens-18-5mm-combined-series-a-and-seed-rounds/
2. Cowboy Ventures investments (CB Insights): https://www.cbinsights.com/investor/cowboy-ventures