[Form 4] QUEST DIAGNOSTICS INC Insider Trading Activity

Rhea-AI Filing Summary

Director Timothy M. Ring reported a non‑derivative change related to deferred compensation in Quest Diagnostics (DGX). On 10/01/2025 he received an accrual of 233 phantom stock units under the company’s Amended and Restated Deferred Compensation Plan for Directors; these units convert to cash payable upon his termination of service as a director. The filing shows 17,036.495 phantom stock units credited in his deferred compensation account as of the transaction date, which includes units from dividend reinvestment transactions exempt from reporting. The Form 4 was signed by an attorney‑in‑fact on 10/03/2025. No option exercises, cash purchases, or sales of common stock are reported in this filing.

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
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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^*

RING TIMOTHY M

(Last) (First) (Middle)

500 PLAZA DRIVE

(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		233		(1)	(1)	Common Stock	233	$0	17,036.495(2)	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 Timothy M. Ring	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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Timothy M. Ring report on Form 4 for DGX?

He reported an accrual of 233 phantom stock units dated 10/01/2025 under the director deferred compensation plan.

How many phantom stock units does Timothy M. Ring beneficially own after the transaction?

The filing shows 17,036.495 phantom stock units credited in his deferred compensation account as of the transaction date.

When will the phantom stock units be payable?

The phantom stock units become payable in cash upon the reporting person's termination of service as a director, per the deferred compensation plan.

Was there any purchase or sale of Quest Diagnostics common stock reported?

No. The filing records phantom stock unit accruals only and does not report purchases or sales of common stock.

Who signed the Form 4 and when?

The Form 4 was signed by Sean D. Mersten, Attorney in Fact for Timothy M. Ring on 10/03/2025.