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Andreessen Horowitz

a16z — Silicon Valley firm founded 2009 by Marc Andreessen and Ben Horowitz. One of the most active backers of AI sta…

Active VC 🇺🇸 United States · Menlo Park, United States · Since 2009
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Portfolio Active
110
Latest Cursor
Deal flow
$107.1B
10 rounds
Unicorns
36
≥ $1B valuation
Founded
2009
17 yrs
Latest
Oct 2026
TypeSafe AI

About Andreessen Horowitz

a16z — Silicon Valley firm founded 2009 by Marc Andreessen and Ben Horowitz. One of the most active backers of AI startups.

Investment activity

2019–2026
$41.1M
$40M
$733.6M
$368.5M
$1.9B
$18.0B
$41.6B
$43.2B
2
'19
1
'20
7
'21
6
'22
19
'23
17
'24
50
'25
22
'26

Portfolio

24

Co-investors

8

Recent rounds

10
Oct 9, 2026 Other $870M Lead TypeSafe AI
Oct 8, 2026 Other $30M Vesta
Sep 11, 2026 Series D $3B The Boring AI Company
Jun 23, 2026 Series A $30M Lead Prosper AI
Jun 3, 2026 Series A $35M Lassie
May 26, 2026 Series B $113M OpenRouter
May 20, 2026 Series D $200M Mercury
May 19, 2026 Seed $10.5M Lead Stilta
May 7, 2026 Series F $1B Kalshi
Apr 9, 2026 Series E $100M Lead Chapter