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Organization and Description of Business (Tables)
 12 Months Ended
Dec. 31, 2024
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 December 31, 2024, it owns 33.4% of the economic interest in DDH LLC. See further discussion of the Up-C structure in Note 6 — Related Party Transactions of our consolidated financial statements. 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