Halcyon
Investing activity
Halcyon appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $6M. The most recent is Theorem (Seed, $6M, Jan 2026).
Halcyon most often invests alongside Khosla Ventures, Safe AI Fund, E14 Fund and Blake Borgeson, and the companies it backs on Lounge are mostly in AI.
Deals
Frequently asked questions about Halcyon
What AI companies has Halcyon invested in?
Halcyon's AI investments include Theorem. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Halcyon invest at?
In the rounds tracked on Lounge, Halcyon has invested at Seed, with a median round of $6M.
Who does Halcyon co-invest with?
Halcyon's most frequent co-investors on Lounge are Khosla Ventures (1 deal), Safe AI Fund (1 deal), E14 Fund (1 deal), Blake Borgeson (1 deal) and Y Combinator (1 deal).
How can founders reach Halcyon?
Founders on Lounge can see Halcyon'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 Halcyon to their Investor Pipeline to track the conversation.