Peter Thiel's Founders Fund is closing its fourth growth fund with $6 billion in capital commitments, according to sources familiar with the firm. The San Francisco-based venture capital firm has attracted strong demand from outside investors, with partners contributing approximately $1.5 billion of the total. This latest raise comes less than a year after the firm closed its third growth fund at $4.6 billion.

Founded in 2005, Founders Fund has built an impressive portfolio including early investments in Stripe, Ramp, Rippling, and Palantir Technologies. The firm also holds stakes in defense tech companies like SpaceX, Flock Safety, and Anduril, which is reportedly raising a $4 billion round at a $60 billion valuation. Last month, Founders Fund made its first direct investment in Anthropic, co-leading a $30 billion investment at a $380 billion post-money valuation, positioning itself as one of the few firms with significant stakes in both leading AI labs alongside its OpenAI investment.

The firm's aggressive growth capital fundraising contrasts with its early-stage strategy. While raising massive growth funds, Founders Fund hasn't launched a new early-stage fund since 2022, when it announced an $1.8 billion vehicle. The firm later cut that fund in half to $900 million in 2023 before reallocating the remaining capital into a separate early-stage fund launched last October.