Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Leib Daniel 2. Issuer Name and Ticker or Trading Symbol Donnelley Financial Solutions, Inc. [DFIN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) C/O DONNELLEY FINANCIAL SOLUTIONS, 391 STEEL WAY 3. Date of Earliest Transaction (Month/Day/Year) 03/03/2026 (Street) LANCASTER, PA 17601 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/03/2026 F(1) 11,800 D $51.77 556,381 D Common Stock 03/03/2026 A(2) 51,447 A $51.77 607,828 D Common Stock 03/03/2026 F(3) 42,399 D $51.77 565,429 D Common Stock 03/03/2026 A 5,252 A (4) 570,681 D Common Stock 03/03/2026 A 55,234 A (5) 625,915 D Common Stock 03/04/2026 F(1) 4,600 D $52.97 621,315(6) D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Leib Daniel C/O DONNELLEY FINANCIAL SOLUTIONS 391 STEEL WAY LANCASTER, PA 17601	X		Chief Executive Officer

Signatures

William Zola, pursuant to power of attorney		03/05/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Shares were withheld as payment of a tax liability incident to vesting of restricted stock units issued in accordance with Rule 16b-3.
(2)	Represents earned portions of Company granted PSUs issued in 2023 pursuant to a Rule 16b-3 plan for which performance has been determined. On March 3, 2026, the Compensation Committee determined the achievement of the performance goals for 2025 and 2023-2025, resulting in 26,553 and 24,894 earned stock units, respectively. The Compensation Committee had previously determined the achievement of the performance goals for 2023 and 2024, resulting in 26,477 and 17,783 earned stock units. The total earned stock units of 95,707 were delivered on March 3, 2026.
(3)	Shares were withheld as payment of a tax liability incident to vesting of performance stock units issued in accordance with Rule 16b-3.
(4)	Represents earned portions of the Company granted PSUs issued in 2024 and 2025 pursuant to a Rule 16b-3 plan for which performance has been determined. For the 2024 PSUs, 10% is subject to performance goals related to 2025 performance, which was determined by the Compensation Committee not to be achieved on March 3, 2026 and resulted in 0 earned stock units related to that performance goal. For the 2025 PSUs, 10% is subject to goals related to 2025 performance, which was determined by the Compensation Committee to be achieved on March 3, 2026 and resulted in 5,252 earned stock units, subject to additional modification based on the Company's relative total shareholder return at the end of 2027. Earned stock units for the 2024 and 2025 PSUs remain subject to service-based vesting until each of the performance periods related to that PSU's goals is complete, at the close of 2026 and 2027 respectively, and final performance and payout is determined.
(5)	Company granted restricted stock units ("RSUs") issued pursuant to a Rule 16b-3 plan. The RSUs vest three equal annual installments beginning on March 3, 2027.
(6)	Includes 517,834 shares held directly, 94,031 restricted stock unit, and 9,450 earned performance share units with additional service-based vesting.

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