Andreessen Horowitz
Also known as a16z
Venture capital firm in Menlo Park founded by Marc Andreessen and Ben Horowitz in 2009.
At a glance
What it owns
Holds stakes in Anchorage Digital, ElevenLabs and 7 others.
See all 12People
Marc Andreessen (co-founded it in 2009), Ben Horowitz (co-founded it in 2009) and Jason Liu
See all 4Connections
Also on this page: Key facts · Links · Sources · Related pages
- Andreessen Horowitz, also called a16z, is an American venture capital firm headquartered in Menlo Park, California.
- Marc Andreessen and Ben Horowitz launched it on 6 July 2009 with a $300 million fund.
- It invests in early-stage startups and growth companies across enterprise software, consumer, fintech, crypto, gaming, healthcare and education.
- It managed about $90 billion as of March 2026.
Key facts
- Founded
- 6 July 2009, by Marc Andreessen and Ben Horowitz1
- Headquarters
- Menlo Park, California1
- Assets under management
- About $90 billion (as of March 2026)1
- Funds
- $300 million first fund, 2009; $9 billion raised January 2022; $15 billion across five funds, January 20261
What it owns
Invested in
- Anchorage DigitalOrganization
early investor source on Anchorage Digital
- ElevenLabsOrganization
co-led the $19 million Series A, led the Series B, co-led the Series C · since Jun 2023 source on ElevenLabs
- FigmaOrganization
led the $50 million Series D · since Apr 2020 source on Figma
- GitHubOrganization
since Jul 2012 source on GitHub
- MavenOrganization
- Mistral AIOrganization
€385M round, December 2023 · since Dec 2023 source on Mistral AI
- StripeOrganization
part of a $2 million round · since 2011 source on Stripe
- Superhuman MailProduct
- Thinking Machines LabOrganization
led the 2025 $2 billion round · since Jul 2025 source on Thinking Machines Lab
Before
Invested in until 14 Aug 2026
Cursor (in the Series B, C and D) source on Cursor
Invested in until Jul 2021
Slack Technologies (Series A in 2010, as Tiny Speck) source on Slack Technologies
Invested in until 2 Feb 2026
xAI (Series B, about $6B round (May 2024)) source on xAI
People
Founded by
- Marc AndreessenPerson
co-founded it in 2009 1
- Ben HorowitzPerson
co-founded it in 2009 1
People
- Jason LiuPerson
scout and angel investor (as of November 2026) 3
Before
People until 2024
Sriram Krishnan (general partner; led the London office from 2023) 2
Connections
On the board of
- ElevenLabsOrganization
board seat · since Jun 2023 source on ElevenLabs
Links
Sources
Last checked against its sources today
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