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Organization and Description of Business (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2025, it owns 63.5% 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:
Subsidiary |  | Business Segment |  | Date of Formation |  | Date of Acquisition
Colossus Media, LLC |  | Sell-side |  | September 8, 2017 |  | June 21, 2018
Orange142, LLC |  | Buy-side |  | March 6, 2013 |  | September 30, 2020
Huddled Masses, LLC |  | Buy-side |  | November 13, 2012 |  | June 21, 2018

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