DFIN Donnelley Financial Solutions Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

Specialized Disclosure Report

Jennifer Reiners

Executive Vice President, General Counsel & Chief Compliance Officer

Donnelley Financial Solutions, Inc.

(844) 866-4337

(Name and telephone number, including area code, of the

person to contact in connection with this report)

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1—Conflict Minerals Disclosure

Conflict Minerals Disclosure

This Form SD is filed by Donnelley Financial Solutions, Inc. (the “Company”) pursuant to Rule 13p-1 promulgated under the Securities Exchange Act of 1934 for the reporting period January 1, 2019 to December 31, 2019.

A copy of the Company’s Conflict Minerals Report is provided as Exhibit 1.01 to this Form SD, and is publicly available on the Investor Relations portion of http://investor.dfsco.com/sec-filings.

As specified in Section 2, Item 2.01 of this Form SD, the Company is hereby filing its Conflict Minerals Report as Exhibit 1.01 to this report.

Section 2—Exhibits

The following exhibit is filed as part of this report.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.