Exhibit 99.1 NEWS RELEASE ICF Reports Third Quarter 2024 Results ―Margin Expansion Driven by Favorable Business Mix and Higher Utilization― ―GAAP EPS and Non-GAAP EPS1 Include Tax Benefits of $0.25 Per Share― ―Record Business Development Pipeline of $10.6 Billion at Quarter-End― ―2024 Guidance: Adjusting Revenue Range to Account for Lower Pass-Throughs; Raising EPS Ranges to Reflect Margin Expansion and Tax Benefits― Third Quarter Highlights: • Revenue Increased 3% to $517 Million, Up 6% Excluding Divestitu ...