Castle Fund
Investing activity
Castle Fund appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $4M. The most recent is Overlord Labs (Seed, $4.3M, Jul 2026).
Castle Fund most often invests alongside Band of Angels, Futureland Ventures, NuFund Venture Group and Sand Hill Angels, and the companies it backs on Lounge are mostly in AI.
Deals
Frequently asked questions about Castle Fund
What AI companies has Castle Fund invested in?
Castle Fund's AI investments include Overlord Labs. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Castle Fund invest at?
In the rounds tracked on Lounge, Castle Fund has invested at Seed, with a median round of $4M.
Who does Castle Fund co-invest with?
Castle Fund's most frequent co-investors on Lounge are Band of Angels (1 deal), Futureland Ventures (1 deal), NuFund Venture Group (1 deal), Sand Hill Angels (1 deal) and Unlock Pacific Ventures (1 deal).
How can founders reach Castle Fund?
Founders on Lounge can see Castle Fund'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 Castle Fund to their Investor Pipeline to track the conversation.