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Series X Capital (SXC) is a venture capital fund based in San Francisco, founded in 2024 by Gideon Yu. The firm has established an exclusive partnership with Alphabet's Google X, which allows it to create independent companies from Google X's pipeline of technology innovations. This partnership positions SXC as the 'last mile of incubation,' focusing on turning X Projects into commercial products and independent enterprises.
As of now, SXC is on track to exceed its initial fund target of $500 million, with a legal obligation to invest exclusively in spin-outs from Google X. The firm operates under a unique model that provides limited partners (LPs) privileged access to Alphabet's moonshot technologies. This structure differentiates SXC from other Alphabet investment arms, such as GV and CapitalG, as it is externally managed.
Series X Capital specializes in investing in deep tech and moonshot technologies, particularly those that emerge from Google X. The firm targets innovations in sectors such as wireless communications, biotech, agtech, and other disciplines developed within the Google X ecosystem. SXC invests at various stages, including pre-seed, seed, seed+ (extension), Series A, and Series A+ (extension), with check sizes ranging from $1 million to $50 million.
The investment strategy emphasizes transforming deep technology innovations into independent commercial enterprises. SXC seeks to partner with founders who are working on groundbreaking technologies that have the potential to disrupt existing markets and create new ones. The firm’s unique access to Google X resources and technologies enhances its ability to support portfolio companies in their growth and development.
Series X Capital has a focused portfolio that includes notable companies spun out from Google X. The two primary portfolio companies are:
Both companies were spun out in 2025 and exemplify SXC's commitment to investing in transformative technologies that have the potential to reshape their respective industries.
Gideon Yu - Founder; Gideon has over 30 years of experience in finance, operations, and investing. He previously served as the CFO of YouTube, overseeing Google's $1.65 billion acquisition. He was also the pre-IPO CFO of Facebook, where he led Microsoft's $375 million investment at a landmark valuation. His background includes venture investing and ownership of sports franchises, including the San Francisco 49ers.
To pitch Series X Capital, founders should use the contact email info@seriesx.capital or submit through their website at seriesx.capital. It is important to include a comprehensive overview of the startup, the technology being developed, and how it aligns with SXC's focus on Google X spin-outs. Founders can expect a response within a few weeks, depending on the volume of inquiries.
As of May 2025, Series X Capital is on track to exceed its initial fund target of $500 million. The firm continues to focus on transforming deep technology innovations from Google X into independent commercial enterprises.
What are Series X Capital's investment criteria?
Series X Capital focuses on deep tech and moonshot technologies, particularly those that are spin-outs from Google X. The firm invests in sectors such as wireless communications, biotech, and agtech, targeting innovations that have the potential for significant market impact.
How can I pitch to Series X Capital?
Founders can pitch to Series X Capital through their website at seriesx.capital. It is advisable to include a clear overview of the technology, market potential, and how it aligns with the firm's focus on Google X innovations.
What is the typical check size for investments?
Series X Capital typically invests between $1 million and $50 million in its portfolio companies, depending on the stage and potential of the startup.
What stages does Series X Capital invest in?
The firm invests across various stages, including pre-seed, seed, seed+ (extension), Series A, and Series A+ (extension), allowing for flexibility in supporting startups at different growth phases.
What makes Series X Capital different from other VC firms?
Series X Capital's exclusive partnership with Google X provides unique access to cutting-edge technologies and resources, enabling the firm to transform deep tech innovations into successful independent enterprises.
What kind of support does Series X Capital provide to its portfolio companies?
In addition to capital, Series X Capital offers its portfolio companies access to Google X's resources and technologies, facilitating their growth and development into independent businesses.
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