Phosphor Capital
Phosphor Capital is a venture capital firm based in San Francisco, founded in January 2024 by Kulveer Taggar, a Y Combinator alumnus. The firm specializes in early-stage investments, focusing on top founders from each Y Combinator batch. With a founder-led approach, Phosphor Capital provides not just capital but also strategic insights, mentorship, and a strong network to support entrepreneurs. The firm launched with a $17 million Fund I and has rapidly expanded its portfolio, investing in over 225 YC companies that have collectively raised $720 million in follow-on funding. Phosphor Capital
Investing activity
Phosphor Capital appears in 6 AI deals tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $6M and the largest at $8M. The most recent are AgentMail (Seed, $6M, Sep 2026), Didit (Seed, $7.5M, May 2026) and Lua (Seed, $5.8M, Apr 2026).
Phosphor Capital most often invests alongside Y Combinator, General Catalyst, Paul Copplestone and Karim Atiyeh, and the companies it backs on Lounge are mostly in AI.
Deals
Frequently asked questions about Phosphor Capital
What AI companies has Phosphor Capital invested in?
Phosphor Capital's AI investments include AgentMail, Didit, Lua, Nexus and Unusual AI. The 6 rounds on Lounge are listed on this page with amounts, dates and co-investors.
Where is Phosphor Capital based?
Phosphor Capital is based in San Francisco, California, United States.
What stage does Phosphor Capital invest at?
In the rounds tracked on Lounge, Phosphor Capital has invested at Seed, with a median round of $6M.
Who does Phosphor Capital co-invest with?
Phosphor Capital's most frequent co-investors on Lounge are Y Combinator (6 deals), General Catalyst (3 deals), Paul Copplestone (2 deals), Karim Atiyeh (2 deals) and Dharmesh Shah (2 deals).
How can founders reach Phosphor Capital?
Founders on Lounge can see Phosphor Capital's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Phosphor Capital to their Investor Pipeline to track the conversation.