X0609 4 2026-09-03 0001669811 Donnelley Financial Solutions, Inc. DFIN 0001990064 Williams Robert Kirk false C/O DONNELLEY FINANCIAL SOLUTIONS 391 STEEL WAY LANCASTER PA 17601 false true false false Chief People & Intl Officer false Common Stock 2026-09-03 4 S false 16450 48.7654 D 44353 D The reported price represents a weighted average sale price. The range of prices at which common stock was sold was $48.75 to $48.87 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 20,000 shares held directly, 22,174 restricted stock units, and 2,179 earned performance share units with additional service-based vesting. William Zola, pursuant to power of attorney 2026-09-08