QUEST DIAGNOSTICS INC (DGX) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-07-22 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: QUEST DIAGNOSTICS INC (DGX) CIK: 0001022079 --- Reporting Owner --- Name: KUPPUSAMY KARTHIK CIK: 0001955217 Role: Officer (SVP, Clinical Solutions) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-07-22 | Code: L Shares: +37 | Price: $206.81 Total Value: $7,651.86 Shares Owned After: 13,557 | 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 exempt purchases made under the Company's stock purchase plan since the date of the last filing on Form 4. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) [Holding #2] Security: Common Stock Ownership: I (Indirect) Footnotes: [F3] These underlying shares were acquired on a periodic basis by the trustee of the Company's tax qualified Profit Sharing (401(k)) Plan. The information was obtained from the plan administrator as of a current date. The number of shares is based on the account balance of the Company stock fund under the Plan (which includes some money market instruments) divided by the market price of the Company's stock as of that date. --- 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 exempt purchases made under the Company's stock purchase plan since the date of the last filing on Form 4. F3: These underlying shares were acquired on a periodic basis by the trustee of the Company's tax qualified Profit Sharing (401(k)) Plan. The information was obtained from the plan administrator as of a current date. The number of shares is based on the account balance of the Company stock fund under the Plan (which includes some money market instruments) divided by the market price of the Company's stock as of that date. --- Signature --- /s/ Sean D. Mersten, Attorney in Fact for Karthik Kuppusamy (2026-07-27)