Andreessen

Marc Andreessen has an estimated net worth of around $1.8 billion as of 2025, accumulated primarily through founding technology companies and venture capital investing.

He co-created Mosaic, the first widely used web browser, and later co-founded Netscape Communications, which was sold to AOL for $4.2 billion in 1999.

Andreessen then co-founded Opsware, a software company acquired by Hewlett-Packard for $1.6 billion.

His largest financial success comes from Andreessen Horowitz (a16z), the venture capital firm he co-founded in 2009, which invested early in companies like Facebook, Airbnb, Coinbase, and GitHub, generating massive returns and solidifying his wealth.