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Organization and Description of Business (Tables)
 3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Ownership in Subsidiaries
Direct Digital Holdings, Inc. owns 100% of the voting interest in DDH LLC and as of March 31, 2025, it owns 39.6% of the economic interest in DDH LLC. See further discussion of the Up-C structure in Note 6 — Related Party Transactions. DDH LLC was formed on June 21, 2018 and acquired by DDH on February 15, 2022 in connection with the Organizational Transactions. DDH LLC’s wholly-owned subsidiaries are as follows:

SubsidiaryBusiness
Segment		Date of FormationDate of
Acquisition
Colossus Media, LLCSell-sideSeptember 8, 2017June 21, 2018
Orange142, LLCBuy-sideMarch 6, 2013September 30, 2020
Huddled Masses, LLCBuy-sideNovember 13, 2012June 21, 2018