=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-08-28
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: QUEST DIAGNOSTICS INC (DGX)
CIK: 0001022079
--- Reporting Owner ---
Name: PREVOZNIK MICHAEL E
CIK: 0001222679
Role: Officer (SVP & General Counsel)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-08-28 | Code: M (Exercise of derivative)
Shares: +22,677 | Price: $112.17
Total Value: $2,543,679.09
Shares Owned After: 60,234 | Ownership: D (Direct)
Footnotes:
[F1] This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.
[Transaction #2]
Security: Common Stock
Date: 2026-08-28 | Code: S (Open market sale)
Shares: -16,010 | Price: $242.88
Total Value: $3,888,436.75
Shares Owned After: 44,224 | Ownership: D (Direct)
Footnotes:
[F1] This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.
[F2] This transaction was executed in multiple trades at prices ranging from $242.270 to $243.269. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #3]
Security: Common Stock
Date: 2026-08-28 | Code: S (Open market sale)
Shares: -6,237 | Price: $243.63
Total Value: $1,519,504.72
Shares Owned After: 37,987 | Ownership: D (Direct)
Footnotes:
[F1] This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.
[F3] This transaction was executed in multiple trades at prices ranging from $243.270 to $244.225. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #4]
Security: Common Stock
Date: 2026-08-28 | Code: S (Open market sale)
Shares: -430 | Price: $244.51
Total Value: $105,141.36
Shares Owned After: 37,557 | Ownership: D (Direct)
Footnotes:
[F1] This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.
[F4] This transaction was executed in multiple trades at prices ranging from $244.280 to $245.247. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #5]
Security: Common Stock
Date: 2026-08-28 | Code: G (Gift)
Shares: -1,000 | Price: $0.00
Shares Owned After: 36,557 | Ownership: D (Direct)
Footnotes:
[F5] On August 28, 2026, the reporting person made a charitable gift of 1,000 shares, a transaction eligible for deferred reporting on Form 5. The reporting person has chosen to report such transaction early on this Form 4.
--- Derivative Transactions ---
[Transaction #1]
Security: Non-Qualifed Stock Option (right to buy)
Date: 2026-08-28 | Code: M (Exercise of derivative)
Shares: -22,677 | Price: $112.17
Exercise Price: $112.17
Exercisable: N/A | Expires: 2030-02-18
Shares Owned After: 0 | Ownership: D (Direct)
Footnotes:
[F1] This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.
[F7] The options vested in three equal annual installments beginning on the first annual anniversary of the grant date.
--- Holdings ---
[Holding #1]
Security: Common Stock
Ownership: I (Indirect)
Footnotes:
[F6] These underlying shares were acquired on a periodic basis by the trustee of the Company's tax qualified Profit Sharing (401(k)) and/or Supplemental Deferred Compensation 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 each 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: This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.
F2: This transaction was executed in multiple trades at prices ranging from $242.270 to $243.269. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
F3: This transaction was executed in multiple trades at prices ranging from $243.270 to $244.225. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
F4: This transaction was executed in multiple trades at prices ranging from $244.280 to $245.247. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
F5: On August 28, 2026, the reporting person made a charitable gift of 1,000 shares, a transaction eligible for deferred reporting on Form 5. The reporting person has chosen to report such transaction early on this Form 4.
F6: These underlying shares were acquired on a periodic basis by the trustee of the Company's tax qualified Profit Sharing (401(k)) and/or Supplemental Deferred Compensation 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 each Plan (which includes some money market instruments) divided by the market price of the Company's stock as of that date.
F7: The options vested in three equal annual installments beginning on the first annual anniversary of the grant date.
--- Signature ---
/s/ Sean D. Mersten, Attorney in Fact for Michael E. Prevoznik (2026-08-31)
