X0306 4 2022-05-12 0 0001669811 Donnelley Financial Solutions, Inc. DFIN 0001464929 Leib Daniel C/O DONNELLEY FINANCIAL SOLUTIONS 35 WEST WACKER DRIVE CHICAGO IL 60601 1 1 0 0 Chief Executive Officer Common Stock 2022-05-12 4 S 0 2123 26.6878 D 643911 D Common Stock 2022-05-12 4 S 0 11481 27.8372 D 632430 D Common Stock 2022-05-12 4 S 0 6396 28.2089 D 626034 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 23, 2021. The reported price represents a weighted average sale price. The range of prices at which common stock was sold was $26.27 to $27.09 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. The reported price represents a weighted average sale price. The range of prices at which common stock was sold was $27.31 to $27.99 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. The reported price represents a weighted average sale price. The range of prices at which common stock was sold was $28.00 to $28.55 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 344,172 shares held directly, 121,901 restricted stock units, and 159,961 earned performance share units with additional service-based vesting. Jennifer Reiners, pursuant to power of attorney 2022-05-13