Actors / Andreessen Horowitz Company Andreessen Horowitz Website a16z.com Tracked events 2 Also known as: Andreessen Horowitz a16z Events 2026 Mar 2026 OpenAI Raises $122B at $852B Valuation — Largest Private Fundraise in History co-investor industry 2025 Jul 2025 Thinking Machines Lab Closes $2B Seed Round at $12B Valuation investor industry