DGX

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.

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

The options vested in three annual installments beginning with the first on February 24, 2023, the second on February 24, 2024 and the final on February 24, 2025.

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

The amount includes exempt purchases made under the Company's stock purchase plan since the date of the last filing on Form 4.

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

The options vested in three annual installments beginning with the first on February 17, 2022, the second on February 17, 2023 and the final on February 17, 2024.

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

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

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

Represents an award of restricted stock units.

Represents an award of restricted stock units.

Represents an award of restricted stock units.

The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4 pursuant to the Amended and Restated Deferred Compensation Plan for Directors.

Represents an award of restricted stock units.

Represents an award of restricted stock units.

The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4 pursuant to the Amended and Restated Deferred Compensation Plan for Directors.

Represents an award of restricted stock units.

Represents an award of restricted stock units.

The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4 pursuant to the Amended and Restated Deferred Compensation Plan for Directors.

Represents an award of restricted stock units.

The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4 pursuant to the Amended and Restated Deferred Compensation Plan for Directors.

Represents an award of restricted stock units.

The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4 pursuant to the Amended and Restated Deferred Compensation Plan for Directors.

Represents an award of restricted stock units.

The amount includes shares acquired via dividend reinvestment since the date of reporting person's last filing on Form 4 pursuant to the Amended and Restated Deferred Compensation Plan for Directors.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5. The reporting person has chosen to report such transaction early on this Form 4.

Represents an award of restricted share units.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4.

Represents an award of restricted share units.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5. The reporting person has chosen to report such transaction early on this Form 4.

Represents an award of restricted share units.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4.

The amount includes exempt purchases made under the Company's stock purchase plan since the date of the reporting person's last filing on Form 4.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4.

Reflects shares that were acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker and eligible for deferred reporting on Form 5 under Rule 16a-6. The reporting person has chosen to report such transaction early on this Form 4.

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.

Represents an award of restricted stock units.

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

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

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

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance share award.

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the settlement of said performance stock award.

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

Stock issued by Quest Diagnostics Incorporated in settlement of a performance stock award approved in accordance with the requirements of Rule 16b-3(d).

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

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

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

Sale of common stock to satisfy tax obligations arising from the vesting of a previous grant of restricted share units.