GPx

About

GPx is a venture capital firm co-founded in 2025 by Brian Singerman and Lee Linden ¹². The firm is headquartered in San Francisco, California ³. GPx raised approximately $500 million for its debut fund, which was announced in July 2025 ¹²⁴.

Brian Singerman is a former General Partner at Founders Fund, where he spent 17 years (2007-2024) before transitioning to Partner Emeritus in December 2024 ⁵⁶. He was originally recruited to Founders Fund by Sean Parker ⁷. Singerman is known for leading Founders Fund’s investments in companies including Stemcentrx (acquired by AbbVie for up to $10.2 billion), Affirm, Oscar Health, Anduril, and Oculus VR ⁷⁸. He was ranked No. 5 on the Forbes Midas List ⁸.

Lee Linden is the co-founder and Managing Partner of Quiet Capital, a venture firm he launched in 2017 ⁹. Before becoming an investor, Linden was a serial entrepreneur: he co-founded Tapjoy and built Karma, a social gifting startup acquired by Facebook (Facebook’s first post-IPO acquisition) ⁹¹⁰. He subsequently ran commerce at Facebook ⁹. Earlier in his career, Linden worked in product development at Microsoft, where he co-created the Windows Home Server division, and at Kleiner Perkins, where he helped launch the $100 million iFund focused on smartphone applications ⁹¹⁰.

A significant portion of GPx’s capital reportedly comes from Peter Thiel, co-founder of Founders Fund, who may contribute up to 50% of the fund ¹⁴. Fund-of-funds capital reached a 16-year low in 2024, according to PitchBook data, yet Singerman and Linden are betting that their personal brands and unique structure will attract limited partners despite typical dual-fee structures ⁴.

Stated Thesis

GPx publicly describes its strategy as a hybrid fund-of-funds and direct investment model designed to support the next generation of venture capital managers ¹²⁴.

The firm allocates approximately 20% of its capital to investing in funds managed by emerging VCs who target pre-seed and seed-stage startups ¹². The remaining approximately 80% is reserved for partnering with those same emerging managers to co-lead later-stage investments — most likely at the Series B stage — in the breakout companies from their portfolios ¹²⁴.

GPx positions itself as solving a structural problem in the venture ecosystem: early-stage VCs often struggle to exercise their pro-rata rights in later funding rounds because their fund sizes are too small to maintain ownership percentages in top-performing companies ¹⁴. When emerging managers face these opportunities, they typically scramble to raise special purpose vehicles (SPVs) from existing limited partners — a time-consuming process that often allows other investors to snap up the equity ¹⁴. GPx provides the capital backing for emerging funds to not only exercise their pro-rata rights but also co-lead later-stage rounds alongside GPx ¹⁴.

Inferred Thesis

No direct portfolio investments have been publicly disclosed as of April 2026. GPx’s fund was announced in July 2025, and the firm has not yet reported specific fund investments (the emerging VC funds backed) or direct co-investments (the Series B rounds co-led) ¹²³.

Based on the founders’ backgrounds, the following patterns can be reasonably expected but remain unverified:

• Stage focus: Series B co-investments for direct deals; pre-seed/seed fund investments via the fund-of-funds allocation
• Sector bias (from founder track records): Singerman’s Founders Fund portfolio was heavily weighted toward biotech, defense technology, fintech, and frontier tech ⁷⁸. Linden’s Quiet Capital portfolio has concentrated on AI, fintech, consumer, deep tech, and health ⁹. The overlap suggests GPx may favor emerging managers in these domains, but this is speculative without disclosed investments.
• Capital allocation: ~$100M (20%) to emerging fund investments; ~$400M (80%) to direct Series B co-investments ¹⁴
• Geographic focus: San Francisco Bay Area likely, given both founders’ base ³

Note: This section will be updated as GPx discloses investments. The inferred thesis cannot be computed from portfolio data because no portfolio data is publicly available.

Portfolio

No portfolio investments (either fund-of-funds commitments to emerging VC funds or direct Series B co-investments) have been publicly disclosed as of April 2026.

In Their Own Words

Brian Singerman has articulated his investing philosophy across several podcast appearances during his time at Founders Fund. While these quotes predate GPx, they reflect the investing mindset he brings to the firm:

On his approach to venture capital, from a 2017 episode of The Twenty Minute VC: Singerman has stated that venture capital is “purely a game of upside maximization” and that “downside minimization is completely unimportant” to him ⁸¹¹.

On evaluating founders: Singerman has said his expertise is “in the founders, the execution of founders, the strategy and the moats that these companies have” and that this approach “just scales across all sectors” ¹¹.

On sector agnosticism: Singerman has stated he is “very very very dogma free and open to anything that walks in the door,” noting that he is “not smart enough to know where” the next world-changing company will come from ¹¹.

No public statements specifically about GPx’s strategy have been made by either Singerman or Linden in interviews or public forums as of April 2026. Neither Founders Fund nor Quiet Capital responded to TechCrunch’s request for comment when the fund was announced ¹.

What Founders Say

No independently sourced founder testimonials found for GPx. The firm has not yet publicly disclosed portfolio investments, so there are no known portfolio founders to survey.

Sources