Quest Diagnostics (DGX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-01-28 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: QUEST DIAGNOSTICS INC (DGX) CIK: 0001022079 --- Reporting Owner --- Name: Lassiter Wright III CIK: 0001805909 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-01-28 | Code: L Shares: +7 | Price: $183.51 Total Value: $1,284.57 Shares Owned After: 9,057 | Ownership: D (Direct) Footnotes: [F1] Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4. [F2] The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4. --- Footnotes (Complete Index) --- F1: Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4. F2: The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4. --- Signature --- /s/ Sean D. Mersten, Attorney in Fact for Wright L. Lassiter, III (2026-02-20)