SCHEDULE 13D/A 0001140361-21-004688 0001260943 XXXXXXXX LIVE 5 Common Stock, par value $0.0001 08/26/2025 false 0001799208 26484T106 Dun & Bradstreet Holdings, Inc.

5335 Gate Parkway Jacksonville FL 32256

Shari Wolkon General Counsel (617) 227-1050 Thomas H. Lee Partners, L.P. 100 Federal Street, 36th Floor Boston MA 02110 0001260943 THOMAS H. LEE ADVISORS, LLC b OO DE 0 0 0 0 0 N 0 OO Y Thomas H. Lee Equity Fund VIII, L.P. b OO DE 0 0 0 0 0 N 0 PN Y Thomas H. Lee Parallel Fund VIII, L.P. b OO DE 0 0 0 0 0 N 0 PN Y THL Executive Fund VIII, L.P. b OO DE 0 0 0 0 0 N 0 PN Y THL Equity Advisors VIII, LLC b OO DE 0 0 0 0 0 N 0 OO Y Thomas H. Lee Partners, L.P. b OO DE 0 0 0 0 0 N 0 PN Y THL Managers VIII, LLC b OO DE 0 0 0 0 0 N 0 OO Y THL Holdco, LLC b OO DE 0 0 0 0 0 N 0 OO Y THL Fund VIII Coinvestment Partners, L.P. b OO DE 0 0 0 0 0 N 0 PN Y THL Equity Fund VIII Investors (D&B), L.P. b OO DE 0 0 0 0 0 N 0 PN Common Stock, par value $0.0001 Dun & Bradstreet Holdings, Inc. 5335 Gate Parkway Jacksonville FL 32256 This Amendment No. 5 (Amendment No. 5) amends and supplements the statement on Schedule 13D originally filed by the Reporting Persons on February 25, 2022 (as amended from time to time, the Schedule 13D). Except as specifically provided herein, this Amendment No. 5 does not modify any of the information previously reported in the Schedule 13D. Unless otherwise indicated, each capitalized term used but not defined in this Amendment No. 5 shall have the meaning assigned to such term in the Schedule 13D. Item 4 of the Schedule 13D is supplemented as follows: As previously disclosed in Amendment No. 4, on March 23, 2025, the Issuer entered into an Agreement and Plan of Merger (the Merger Agreement) with Denali Intermediate Holdings, Inc., and Denali Buyer, Inc., whereby, subject to the terms thereof, Denali Buyer, Inc. will merge with and the Issuer (the Merger), with the Issuer surviving the Merger as a direct wholly owned subsidiary of Denali Intermediate Holdings, Inc. On August 26, 2025, the Merger was consummated in accordance with the Merger Agreement, and each outstanding share of Common Stock was cancelled and converted into the right to receive $9.15 in cash per share without interest and subject to deduction for any applicable withholding taxes. Accordingly, on August 26, 2025, the Reporting Persons ceased to beneficially own any shares of Common Stock. Item 5(a) of the Schedule 13D is supplemented as follows: The percentage of beneficial ownership in this Amendment No. 5 is based on 446,189,224 shares of Common Stock outstanding as of August 1, 2025, as reported in the Issuers Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025 Item 5(b) of the Schedule 13D is supplemented as follows: The aggregate number of shares of Common Stock beneficially owned by each Reporting Person and, for each Reporting Person, the number of shares as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition are set forth on rows 7 through 11 and row 13 of the cover pages of this Amendment No. 5 and are incorporated herein by reference. Item 5(c) of the Schedule 13D is supplemented as follows: Except as reported in this Amendment No. 5, no transactions with respect to the shares of Common Stock were effected during the past sixty days by any of the Reporting Persons. Not applicable. The Reporting Persons ceased to be the beneficial owners of more than five percent of the Issuers Common Stock on August 26, 2025. THOMAS H. LEE ADVISORS, LLC /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 Thomas H. Lee Equity Fund VIII, L.P. /s/ THL Equity Advisors VIII, LLC 08/26/2025 /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter/ Chief Financial Officer 08/26/2025 Thomas H. Lee Parallel Fund VIII, L.P. /s/ THL Equity Advisors VIII, LLC 08/26/2025 /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 THL Executive Fund VIII, L.P. /s/ THL Equity Advisors VIII, LLC 08/26/2025 /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 THL Equity Advisors VIII, LLC /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 Thomas H. Lee Partners, L.P. /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC/ Managing Member 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 THL Managers VIII, LLC /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 THL Holdco, LLC /s/ Jeffrey Schechter/ Chief Financial Officer 08/26/2025 THL Fund VIII Coinvestment Partners, L.P. /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025 THL Equity Fund VIII Investors (D&B), L.P. /s/ THL Equity Advisors VIII 08/26/2025 /s/ Thomas H. Lee Partners, L.P. 08/26/2025 /s/ Thomas H. Lee Advisors, LLC 08/26/2025 /s/ THL Holdco, LLC 08/26/2025 /s/ Jeffrey Schechter 08/26/2025