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Personnel: Marc Andreessen at Andreessen Horowitz (a16z) (Co-founder & General Partner)

Verdictconfirmed95%
1 check · 4/9/2026

The source explicitly confirms that Marc Andreessen is a co-founder of Andreessen Horowitz (a16z) and that the firm was announced on July 6, 2009. The source also confirms his role as a general partner through multiple references to him as 'co-founder and general partner of Silicon Valley venture capital firm Andreessen Horowitz.' The startDate of 2009 is confirmed by the July 6, 2009 announcement date. All key fields in the record are directly supported by the source text.

Our claim

entire record
Role
Co-founder & General Partner
Role Type
career
Start Date
2009
Is Founder
Yes
Notes
Co-founded VC firm a16z; invested in major AI companies; previously co-founded Netscape and Mosaic

Source evidence

1 src · 1 check
confirmed95%Haiku 4.5 · 4/9/2026

NoteThe source explicitly confirms that Marc Andreessen is a co-founder of Andreessen Horowitz (a16z) and that the firm was announced on July 6, 2009. The source also confirms his role as a general partner through multiple references to him as 'co-founder and general partner of Silicon Valley venture capital firm Andreessen Horowitz.' The startDate of 2009 is confirmed by the July 6, 2009 announcement date. All key fields in the record are directly supported by the source text.

Case № bgd5isVyoJFiled 4/9/2026Confidence 95%
Source Check: Personnel: Marc Andreessen at Andreessen Horowitz (a16z) (Co-founder & General Partner) | Longterm Wiki