X0508 4 2024-09-19 0001669811 Donnelley Financial Solutions, Inc. DFIN 0001464929 Leib Daniel C/O DONNELLEY FINANCIAL SOLUTIONS 35 WEST WACKER DRIVE CHICAGO IL 60601 true true false false Chief Executive Officer true Common Stock 2024-09-19 4 S false 2619 70.0261 D 515191 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 27, 2024. The reported price represents a weighted average sale price. The range of prices at which common stock was sold was $70.00 to $70.10 per share. The Reporting Person undertakes to provide to the staff, the issuer or a security holder full information regarding the number of shares sold at each separate price. Includes 371,527 shares held directly, 70,451 restricted stock unit, and 73,213 earned performance share units with additional service-based vesting. William Zola, pursuant to power of attorney 2024-09-20