QUEST DIAGNOSTICS INC — Director's Dealing 2026

Feb 20, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: QUEST DIAGNOSTICS INC (DGX)
CIK: 0001022079
Period of Report: 2026-02-18

Reporting Person: Doherty Catherine T. (EVP, Regional Businesses)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-18	Common Stock	A	2928	—	Acquired	70996	Direct
2026-02-18	Common Stock	F	433	$210.01	Disposed	70563	Direct
2026-02-18	Common Stock	F	728	$206.99	Disposed	69835	Direct
2026-02-19	Common Stock	S	1433	$204.83	Disposed	68402	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-18	Non-Qualifed Stock Option (right to buy)	$204.96	A	13514	Acquired	2036-02-18	Common Stock (13514)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	4503	Indirect

Footnotes

F1: Represents an award of restricted stock units.

F2: Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the vesting of restricted stock units.

F3: This exercise and sale reported were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.

F4: 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.

F5: The options vest in three equal annual installments beginning on the first annual anniversary of the grant date.