[Form 4] QUEST DIAGNOSTICS INC Insider Trading Activity

Rhea-AI Filing Summary

Wright L. Lassiter III, a director of Quest Diagnostics Inc. (DGX), reported on Form 4 that on 10/01/2025 he received 157 phantom stock units under the company's deferred compensation plan for directors. These phantom units arose from elective deferrals of the director's cash compensation and are payable in cash when the reporting person leaves board service. The filing states the total phantom stock units accrued in his deferred compensation account as of the transaction date include dividend-reinvestment credits exempt from separate reporting. The Form 4 shows zero dollar price for the transaction and indicates indirect ownership treatment for the accrued units.

Insights

Corporate Governance Specialist

Director deferred compensation increased by 157 phantom units on 10/01/2025.

The Form 4 discloses that 157 phantom stock units were credited to Wright L. Lassiter III via elective deferrals under the Deferred Compensation Plan for Directors. These units are contractual credits that become payable in cash upon the director's termination of service, so they represent future cash obligations, not immediate stock dilution.

The filing also notes additional phantom units from dividend reinvestment transactions that are exempt from reporting; the total accrued balance is described in the form. Because the transaction records a $0 price and is classified as indirect ownership, this is a routine compensation-related reporting event rather than an open-market purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Lassiter Wright III

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock Units	157	$0.00	--

Holdings After Transaction: Phantom Stock Units — 678.777 shares (Direct)

Footnotes (1)

1. Phantom stock units resulting from elective deferrals of a director's cash compensation pursuant to the Quest Diagnostics Incorporated Amended and Restated Deferred Compensation Plan for Directors and become payable in cash upon the reporting person's termination of service as a director. Total number of phantom stock units accrued as of the transaction date in the reporting person's deferred compensation account includes phantom stock units credited as a result of dividend reinvestment transactions exempt from reporting pursuant to Rule 16a-11.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Lassiter Wright III

(Last) (First) (Middle)

500 PLAZA DRIVE

C/O QUEST DIAGNOSTICS

(Street)

SECAUCUS NJ 07094

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
QUEST DIAGNOSTICS INC [ DGX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Phantom Stock Units	$0	10/01/2025		A		157		(1)	(1)	Common Stock	157(2)	$0	678.777	D

Explanation of Responses:

1. Phantom stock units resulting from elective deferrals of a director's cash compensation pursuant to the Quest Diagnostics Incorporated Amended and Restated Deferred Compensation Plan for Directors and become payable in cash upon the reporting person's termination of service as a director.

2. Total number of phantom stock units accrued as of the transaction date in the reporting person's deferred compensation account includes phantom stock units credited as a result of dividend reinvestment transactions exempt from reporting pursuant to Rule 16a-11.

Remarks:

	Sean D. Mersten, Attorney in Fact for Wright L. Lassiter, III	10/03/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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