X0508 4 2023-07-28 0 0001906324 QuidelOrtho Corp QDEL 0001609320 Kroll Werner 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 SVP, Research & Development 0 Common Stock 2023-07-28 4 A 0 1170 0.00 A 30188 D Common Stock 2023-07-28 4 F 0 549 87.12 D 29639 D Restricted Stock Units 2023-07-28 4 M 0 1170 0.00 D Common Stock 1170 1170 D Reflects release of restricted stock units that were previously reported on a Form 4. The amount of shares beneficially owned following this transaction include an additional 218 shares due to the Reporting Person's purchase of shares pursuant to the Issuer's Employee Stock Purchase Plan. Disposition of shares, as set forth above, was in connection with the Issuer's withholding of common shares to satisfy tax withholding obligations related to the issuance of common shares upon release of restricted stock units. Each restricted stock unit represents the right to receive one share of QuidelOrtho Corporation common stock. 1,170 shares vested on July 28, 2023; 1,170 shares will vest on July 28, 2024. /s/ Phillip S. Askim, attorney-in-fact for Werner Kroll 2023-08-01