X0306 4 2023-02-23 0 0001669811 Donnelley Financial Solutions, Inc. DFIN 0001847703 Clay Craig C/O DONNELLEY FINANCIAL SOLUTIONS 35 WEST WACKER DRIVE CHICAGO IL 60601 0 1 0 0 President, GCM Common Stock 2023-02-23 4 M 0 11600 22.35 A 128904 D Common Stock 2023-02-23 4 M 0 9675 14.15 A 139579 D Common Stock 2023-02-23 4 S 0 6680 41.8847 D 131899 D Common Stock 2023-02-23 4 S 0 11110 42.6264 D 120789 D Common Stock 2023-02-23 4 S 0 3485 43.5913 D 117304 D Employee Stock Option (right to buy) 22.35 2023-02-23 4 M 0 11600 0.00 D 2027-03-01 Common Stock 11600 0 D Employee Stock Option (right to buy) 14.15 2023-02-23 4 M 0 9675 0.00 D 2029-03-04 Common Stock 9675 3225 D The exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 27, 2022. The reported price represents a weighted average sale price. The range of prices at which common stock was sold was $41.34 to $42.33 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 $42.36 to $43.30 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 $43.36 to $43.75 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 45,518 shares held directly, 33,567 restricted stock units, and 38,219 earned performance share units with additional service-based vesting. The option vests/ vested in four equal annual installments beginning on March 2, 2018. The option vests/ vested in four equal annual installments beginning on March 5, 2020. Jennifer Reiners, pursuant to power of attorney 2023-02-27