Quest Diagnostics director Pfeiffer sells 1,203 shares

After the transaction, director Gary M. Pfeiffer directly held 29,802 shares of Quest Diagnostics common stock.

Rhea-AI Filing Summary

Quest Diagnostics Inc. (DGX) director Gary M. Pfeiffer sold 1,203 shares of common stock at $243 per share on October 26, 2026. The sale was effected pursuant to a Rule 10b5-1 sales plan adopted by Gary M. Pfeiffer. He directly held 29,802 shares after the transaction.

Insider Trade Summary 10b5-1

Net Seller: 1,203 shares

Net Sell 1 txn

Insider PFEIFFER GARY M

Role Director

Sold 1,203 shs ($292K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	1,203	$243.00	$292K

Holdings After Transaction: Common Stock — 29,802 shares (Direct)

Footnotes (1)

1. F1. This sale reported was effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.

Key Figures

Shares Sold: 1,203 shares Sale Price: $243 per share Direct Shares Held After Transaction: 29,802 shares

3 metrics

Shares Sold 1,203 shares October 26, 2026

Sale Price $243 per share October 26, 2026

Direct Shares Held After Transaction 29,802 shares After the October 26, 2026 transaction

Key Terms

Rule 10b5-1 sales plan

1 terms

Rule 10b5-1 sales plan regulatory

"effected pursuant to a Rule 10b5-1 sales plan"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many DGX shares did director Gary M. Pfeiffer sell?

Gary M. Pfeiffer sold 1,203 shares of Quest Diagnostics common stock at $243 per share on October 26, 2026. The sale was effected pursuant to a Rule 10b5-1 sales plan he adopted, and he directly held 29,802 shares after the transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/28/2026 - 06:06 PM EDT Accepted by SEC EDGAR 10/28/2026 - 06:05 PM EDT Learn about SEC filing dates

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).

X

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^*

PFEIFFER GARY M

(Last) (First) (Middle)

500 PLAZA DRIVE

(Street)

SECAUCUS NEW JERSEY 07094

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/26/2026

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

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

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

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	10/26/2026		S(1)		1,203	D	$243	29,802	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:

1. This sale reported was effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person.

Remarks:

	Sean D. Mersten, Attorney in Fact for Gary M. Pfeiffer	10/28/2026
	** 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.
* Form 4: SEC 1474 (03-26)