Infisical, a San Francisco security startup, said Tuesday it raised $40 million in Series B funding at a $600 million valuation, led by investor Elad Gil^1,2,3.

Techmeme summarized a Forbes report that the company helps firms use AI agents without handing over private credentials¹. Infisical's own blog and a PR Newswire release described the same product as Agent Vault^2,3.

Gil previously invested in Infisical's Series A and led the new round, the company said^2,3. Infisical said Y Combinator and Gradient Ventures increased their stakes, with Gallery Ventures, Pace Capital, Dynamic Capital and other investors also participating². The press release named Gradient and Y Combinator among other investors without listing the additional firms named on the blog³.

Infisical said AI agents need access to source code, databases and cloud systems, which typically requires API keys, passwords and tokens that agents should not hold³. CEO Vlad Matsiiako said agents should not get unrestricted access to every company system³.

The company said it serves more than 1,300 customers and 300,000 developers and secures 10 billion secrets a day, with an open-source project above 30,000 GitHub stars^2,3. Named customers in the release include Airbus, Volkswagen, Hugging Face, OpenRouter, First American Financial, Wise and Clay³. The blog also named LG and the U.S. government².

Infisical said it will use the money to speed product work, hire in engineering and go-to-market, and expand agent-security infrastructure, including Agent Vault^2,3. Gil said securing agent access will be a major cybersecurity challenge as agents become a new class of enterprise users³.

Forbes's full article, as linked via Techmeme, could not be read in this filing; round terms beyond the $40 million and $600 million figures come from Infisical's statements^1,2,3.