[Form 4] QUEST DIAGNOSTICS INC Insider Trading Activity

Rhea-AI Filing Summary

Quest Diagnostics director reports small stock sale

A director of Quest Diagnostics Inc. reported selling 1,250 shares of common stock on 11/25/2025 at a price of $191.76 per share. This insider now directly owns 17,037 Quest Diagnostics shares after the transaction. The filing is a Form 4 submitted for board member Vicky B. Gregg, with the form signed by an attorney-in-fact.

Insider Trade Summary

Net Seller: 1,250 shares ($239,700)

Net Sell 1 txn

Insider Gregg Vicky B

Role Director

Sold 1,250 shs ($240K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,250	$191.76	$240K

Holdings After Transaction: Common Stock — 17,037 shares (Direct)

Footnotes (1)

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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Gregg Vicky B

(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)
11/25/2025

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
Common Stock	11/25/2025		S		1,250	D	$191.76	17,037	D

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

Explanation of Responses:

Remarks:

	Sean D. Mersten, Attorney in Fact for Vicky B. Gregg	11/28/2025
	** 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 insider transaction did Quest Diagnostics (DGX) disclose?

Quest Diagnostics disclosed that director Vicky B. Gregg sold 1,250 shares of common stock on 11/25/2025 at $191.76 per share.

How many Quest Diagnostics (DGX) shares does the director own after the sale?

Following the reported sale, the director beneficially owns 17,037 shares of Quest Diagnostics common stock in direct ownership.

What form was filed for the Quest Diagnostics (DGX) insider trade?

The transaction was reported on Form 4, which insiders use to disclose changes in ownership of Quest Diagnostics equity securities.

What is the role of the reporting person at Quest Diagnostics (DGX)?

The reporting person is a Director of Quest Diagnostics Inc., as indicated in the filing’s relationship section.

Who signed the Quest Diagnostics (DGX) Form 4 for this transaction?

The Form 4 was signed by Sean D. Mersten as Attorney in Fact for Vicky B. Gregg on 11/28/2025.

Did the Quest Diagnostics (DGX) Form 4 include any derivative securities activity?

The filing’s Table II for derivative securities was present but did not list any derivative transactions or holdings in the provided content.