Item 6. Exhibits Copy as markdown Exhibits:
22 Subsidiary Guarantors of Securities 31.1 Rule 13a-14(a) Certification of Chief Executive Officer 31.2 Rule 13a-14(a) Certification of Chief Financial Officer 32.1 Section 1350 Certification of Chief Executive Officer 32.2 Section 1350 Certification of Chief Financial Officer 99.1 Amendment No. 11 To Sixth Amended and Restated Credit and Security Agreement, dated as of April 30, 2025. 99.2 Amendment and Restatement Agreement, dated as of April 30, 2025 , relating to the Third Amended and Restated Credit Agreement dated as of November 23, 2021 (as amended, amended and restated, supplemented or otherwise modified ), among Quest Diagnostics Incorporated , the Lenders from time to time party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, and the other agents party thereto. 99.3 Fourth Amended and Restated Credit Agreement, dated as of April 30, 2025, among Quest Diagnostics Incorporated, as Borrower, the lenders party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, and other agents party thereto, forming Exhibit A to the Amendment and Restatement Agreement in Exhibit 99.2. 101.INS Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 101.SCH Inline XBRL Taxonomy Extension Schema Document - dgx-20250630.xsd 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document - dgx-20250630_cal.xml 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document - dgx-20250630_def.xml 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document - dgx-20250630_lab.xml 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document - dgx-20250630_pre.xml 104 Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101)
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 undersigned, thereunto duly authorized.
July 23, 2025
Quest Diagnostics Incorporated
By /s/ James E. Davis James E. Davis Chairman, Chief Executive Officer and President By /s/ Sam A. Samad Sam A. Samad Executive Vice President and Chief Financial Officer
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