# EDGAR Filing Document

**Accession Number:** 0001022079
**File Stem:** 0001140361-26-013357
**Filing Date:** 2026-4
**Character Count:** 2187
**Document Hash:** 30748b3916d6af911be100f772c6e416
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-013357.hdr.sgml**: 20260406

**ACCESSION NUMBER**: 0001140361-26-013357

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260406

**DATE AS OF CHANGE**: 20260406

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** QUEST DIAGNOSTICS INC
- **CENTRAL INDEX KEY:** 0001022079
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MEDICAL LABORATORIES [8071]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 161387862
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-12215
- **FILM NUMBER:** 26841689

**BUSINESS ADDRESS:**
- **STREET 1:** 500 PLAZA DRIVE
- **CITY:** SECAUCUS
- **STATE:** NJ
- **ZIP:** 07094
- **BUSINESS PHONE:** 9735202700

**MAIL ADDRESS:**
- **STREET 1:** 500 PLAZA DRIVE
- **CITY:** SECAUCUS
- **STATE:** NJ
- **ZIP:** 07094

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CORNING CLINICAL LABORATORIES INC
- **DATE OF NAME CHANGE:** 19960903

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#### SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.)

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

**Check the appropriate box:**

**☐** Preliminary Proxy Statement

**☐** Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

**☐** Definitive Proxy Statement

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**☒** Definitive Additional Materials

**☐** Soliciting Material Pursuant to §240.14a-12

<u>Quest Diagnostics Incorporated</u>

(Name of Registrant as Specified In Its Charter)

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

**Payment of Filing Fee (Check the appropriate box):**

**** 

<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**☒** No fee required.

**☐** Fee paid previously with preliminary materials

**☐** Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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![](ny20064122x2_nc01.jpg)

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