Exhibit 99.1 Direct Digital Holdings Reports Second Quarter 2025 Financial Results Revenues Increased 24% Sequentially Over Q1 2025; Consolidated Gross Margin Improved Sequentially to 35% Compared to 29% in Q1 2025 • Processed approximately 182 billion average monthly impressions through the sell-side advertising segment. • Number of sell-side advertisers increased over 30% compared to the second quarter of 2024. • Average sell-side media properties of 30,000 per month in the second quarter of 2025 increase ...