=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-06-04
10b5-1 Pre-arranged Plan: Yes
--- 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: 2026-06-04 | Code: M (Exercise of derivative)
Shares: +3,320 | Price: $127.72
Total Value: $424,047.00
Shares Owned After: 16,830 | 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: 2026-06-04 | Code: M (Exercise of derivative)
Shares: +4,827 | Price: $121.81
Total Value: $587,952.73
Shares Owned After: 21,657 | 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 #3]
Security: Common Stock
Date: 2026-06-04 | Code: S (Open market sale)
Shares: -8,147 | Price: $200.00
Total Value: $1,629,400.00
Shares Owned After: 13,510 | 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] The amount includes exempt purchases made under the Company's stock purchase plan since the date of the last filing on Form 4.
--- Derivative Transactions ---
[Transaction #1]
Security: Non-Qualifed Stock Option (right to buy)
Date: 2026-06-04 | Code: M (Exercise of derivative)
Shares: -3,320 | Price: $127.72
Exercisable: N/A | Expires: 2032-02-24
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.
[F4] The options vested in three annual installments beginning with the first on February 24, 2023, the second on February 24, 2024 and the final on February 24, 2025.
[Transaction #2]
Security: Non-Qualifed Stock Option (right to buy)
Date: 2026-06-04 | Code: M (Exercise of derivative)
Shares: -4,827 | Price: $121.81
Exercisable: N/A | Expires: 2031-02-17
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.
[F5] The options vested in three annual installments beginning with the first on February 17, 2022, the second on February 17, 2023 and the final on February 17, 2024.
--- Holdings ---
[Holding #1]
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.
[Holding #2]
Security: Common Stock
Ownership: I (Indirect)
--- 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: 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.
F4: The options vested in three annual installments beginning with the first on February 24, 2023, the second on February 24, 2024 and the final on February 24, 2025.
F5: The options vested in three annual installments beginning with the first on February 17, 2022, the second on February 17, 2023 and the final on February 17, 2024.
--- Signature ---
/s/ Sean D. Mersten, Attorney in Fact for Karthik Kuppusamy (2026-06-08)
