FirstMark is an early-stage venture capital firm in New York City[2] that invests in enterprise, consumer, and frontier tech founders[1]. The firm provides support services to startup founders[6] alongside its investment activities[1]. Founded in 2005[4], FirstMark has maintained its headquarters in New York[5]. The firm has participated in funding rounds for artificial intelligence companies, including investments in Henry AI's $16.5 million seed round and Overtone's $18 million round, both of which closed in July 2026[3].
Org chart
Alumni
Investments
- CDaytona
An infrastructure platform for secure, scalable execution of AI-generated code in isolated sandboxes with programmatic control for developers and AI systems
Henry
Automating Deal Decks for Commercial Real Estate Brokers
- COvertone
Overtone, a modern matchmaking company that uses AI and voice technology to provide highly curated romantic introductions grounded in relationship science
TensorZero
New York-based AI company building an open-source stack (gateway, observability, evaluations and optimization) for industrial-grade LLM applications.
Vendelux
New York company using AI and event data to help B2B marketers choose and measure conferences.
NYC headquarters
- The company's own site places it in New York: Text explicitly states 'FirstMark is an early-stage venture capital firm in New York City' multiple times throughout the page..[5]
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