X0508 4 2026-02-18 0 0001022079 QUEST DIAGNOSTICS INC DGX 0001771759 Deppe Michael J 500 PLAZA DRIVE SECAUCUS NJ 07094 0 1 0 0 SVP, Corp. Controller & CAO 0 Common Stock 2026-02-18 4 A 0 366 0 A 34742 D Common Stock 2026-02-18 4 F 0 83 210.01 D 34659 D Common Stock 2026-02-18 4 F 0 99 206.99 D 34560 D Common Stock 706 I 401(k) Non-Qualifed Stock Option (right to buy) 204.96 2026-02-18 4 A 0 1688 0 A 2036-02-18 Common Stock 1688 1688 D Represents an award of restricted stock units. Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the vesting of restricted stock units. The amount includes exempt purchases made under the Company's stock purchase plan since the date of the last filing on Form 4. These underlying shares were acquired on a periodic basis by the trustee of the Company's tax qualified Profit Sharing (401(k)) Plan. The information was obtained from the plan administrator as of a current date. The number of shares is based on the account balance of the Company stock fund under the Plan (which includes some money market instruments) divided by the market price of the Company's stock as of that date. The options vest in three equal annual installments beginning on the first annual anniversary of the grant date. Sean D. Mersten, Attorney in Fact for Michael J. Deppe 2026-02-20