Funding › Investors

FirstMark portfolio: 3 rounds in AI and data

Rounds where FirstMark led or took part, newest first. Led: 1.

1. Rillet raises $100M Series C, Aug 18, 2026. AI apps. Led by Iconiq. AI-native accounting and general ledger platform for finance teams.
2. Onyx Security raises $113M Series B, Jul 30, 2026. Security. Led by Bessemer Venture Partners. Onyx Security monitors enterprise AI agents and enforces governance rules on their actions in real time.
3. Nebulock raises $25M Series A, Jun 26, 2026. Security. Led by FirstMark. Nebulock runs AI-driven threat hunting and behavioral analytics across endpoint, cloud and identity activity.