Citadel
Citadel Investments Group, Inc. is an alternative investment firm. The Firm focuses on pursuing long-term returns for public and private institutions, as well as trades equities, equity options, and interest rate swaps for retail and institutional clients. Citadel Investments Group serves clients worldwide.
Investing activity
Citadel appears in 1 AI deal tracked by the AI Lounge deals desk, rounds totalling $2B. The rounds are mostly Series C, with a median round size of $2B. The most recent is Nscale (Series C, $2B, Mar 2026).
Citadel most often invests alongside Aker ASA, 8090 Industries, Jane Street and Dell, and the companies it backs on AI Lounge are mostly in Data Center.
Deals
Frequently asked questions about Citadel
What AI companies has Citadel invested in?
Citadel's AI investments include Nscale. The 1 round on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Citadel based?
Citadel is based in Chicago, Illinois, United States.
What stage does Citadel invest at?
In the rounds tracked on AI Lounge, Citadel has invested at Series C, with a median round of $2B.
Who does Citadel co-invest with?
Citadel's most frequent co-investors on AI Lounge are Aker ASA (1 deal), 8090 Industries (1 deal), Jane Street (1 deal), Dell (1 deal) and Astra Capital Management (1 deal).
How can founders reach Citadel?
Founders on AI Lounge can see Citadel'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 Citadel to their Investor Pipeline to track the conversation.