Direct Digital Holdings, Inc. is a holding company. The Company provides end-to-end, full-service programmatic advertising platform primarily focused on providing advertising technology, data-driven campaign optimization and other solutions to underserved and less efficient markets on both the buy-and sell-side of the digital advertising ecosystem. The Company through its subsidiary, Colossus Media operates its sell-side programmatic platform operating under the trademarked banner of Colossus SSP. Huddled Masses is the platform for the buy-side of the Company’s business. The Company serves industries, such as travel, healthcare, education, financial services and consumer products and other. Its platform enables small- and mid-sized clients to purchase programmatic technology to engage their potential customers more directly, on a one-on-one basis, in any local market, with specificity to media device.