Union Square Ventures (USV) is an American venture capital firm based in New York City. Founded in 2003 by Fred Wilson and Brad Burnham, the firm has backed more than 130 startups, including Twitter, Etsy, Stripe, Coinbase, Zynga, Tumblr, Stack Overflow, Meetup, Kickstarter, MongoDB, Flurry, Cloudflare, Duolingo, Soundcloud, Clue, and Carta. USV focuses on early-stage companies, primarily in the United States, that are considered disruptive in internet and mobile sectors. The firm has been recognized for its performance, with its 2004 fund ranking among the best-performing venture capital funds in history and being named the best-performing venture capital firm in the United States in 2011 based on investment return rate.
History and Growth
USV was established with the intent to foster early-stage innovation. Over the years, the firm has expanded its team with notable partners. In 2007, Albert Wenger, former president of del.icio.us, joined as managing partner. In 2011, Betaworks co-founder Andy Weissman came on board. Rebecca Kaden, previously a General Partner at Maveron, joined in 2018. In 2019, Gillian Munson, former CFO of XO Group, and Nick Grossman, who had worked on special projects at USV, became partners. In 2021, Samson Mesele, a former corporate attorney at Wachtell, Lipton, Rosen & Katz, joined as general counsel and partner. As of 2016, USV had achieved seven billion-dollar exits, including Twitter in 2013 and Twilio in 2016.
Investment Thesis and AI Focus
USV's investment thesis centers on identifying companies that leverage network effects and data to create transformative platforms. In recent years, the firm has increasingly focused on Artificial intelligence (AI) as a key area. USV has invested in AI-driven startups across various sectors, including healthcare, autonomous vehicles, and language models. The firm's approach emphasizes supporting founders who apply Machine learning and Deep learning techniques to solve complex problems. USV has backed companies like Sanctuary AI, which develops humanoid robots, and Fermata, which uses AI for agricultural monitoring. The firm's AI portfolio also includes AI21 Labs, a company specializing in large language models, and Inflection AI, which focuses on personal AI assistants.
Notable AI Investments
Among USV's AI-related investments, several stand out. Figure AI is a robotics company working on general-purpose humanoid robots, which aligns with USV's interest in Generative AI and automation. Waymo, a self-driving car company, represents USV's bet on autonomous mobility, leveraging Neural network and Transformer (architecture) architectures. In healthcare, Commure uses AI to streamline clinical workflows, and Intuitive Surgical (though not a direct USV investment, it is a comparable example) illustrates the potential of AI in medical devices. USV has also invested in BigBear.ai, which provides predictive analytics for defense and intelligence, and Essential AI, which focuses on AI safety and alignment. These investments reflect USV's strategy of backing companies that apply AI to create significant market shifts.
AI Thesis and Future Directions
USV's AI thesis is rooted in the belief that AI will become a foundational technology across industries. The firm looks for startups that use Large language model and Transformer (architecture) technologies to build products with network effects. USV is particularly interested in applications that enhance human productivity, such as OpenAI and Anthropic (though not direct investments, they are benchmarks in the space). The firm also monitors developments in Amazon Web Services and AWS Trainium for infrastructure opportunities. USV's partners, including Brad Lightcap (who is a partner at OpenAI, not USV, but relevant to the ecosystem), often discuss the importance of Reinforcement Learning from AI Feedback (RLAIF) (reinforcement learning from human feedback) and Multi-Head Attention in advancing AI capabilities. As of 2025, USV continues to explore investments in AI infrastructure, including chips like AMD and Arm Holdings, and cloud services such as Microsoft Azure and Google Cloud. The firm's focus remains on early-stage companies that can leverage AI to disrupt existing markets.
Impact and Recognition
USV's impact on the venture capital landscape is significant. The firm's early investments in companies like Twitter and Etsy have yielded substantial returns, and its AI-focused investments are expected to drive future growth. USV is regularly included in Red Herring's lists of top venture capital firms. The firm's 2004 fund is often cited as one of the best-performing venture capital funds in history. With a team of experienced partners and a clear thesis on AI, USV is well-positioned to continue backing transformative startups. The firm's commitment to supporting disruptive technologies, combined with its track record, makes it a key player in the AI investment space.