Sec Form 3 Filing - McLellan Philip D. @ QuidelOrtho Corp - 2024-11-15

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person McLellan Philip D. 2. Issuer Name and Ticker or Trading Symbol QuidelOrtho Corp [ QDEL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Operations Officer (Last) (First) (Middle) 9975 SUMMERS RIDGE ROAD 3. Date of Earliest Transaction (MM/DD/YY) 11/15/2024 (Street) SAN DIEGO, CA92121 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 5,549 D

< td> 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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 Non-Qualified Stock Options $ 248.41 ( 1 ) 11/02/2030 Common Stock 1,678 D Non-Qualified Stock Options $ 254 ( 2 ) 02/01/2031 Common Stock 1,352 D Non-Qualified Stock Options $ 103.36 ( 3 ) 01/31/2032 Common Stock 4,507 D Non-Qualified Stock Options $ 88.67 ( 4 ) 04/26/2033 Common Stock 5,836 D Non-Qualified Stock Options $ 39.08 ( 5 ) 04/22/2034 Common Stock 9,714 D Restricted Stock Units ( 7 ) ( 6 ) ( 6 ) Common Stock 338 D Restricted Stock Units ( 7 ) ( 8 ) ( 8 ) Common Stock 420 D Restricted Stock Units ( 7 ) ( 9 ) ( 9 ) Common Stock 2,254 D Restricted Stock Units ( 7 ) ( 10 ) ( 10 ) Common Stock 1,693 D Restricted Stock Units ( 7 ) ( 11 ) ( 11 ) Common Stock 2,009 D Restricted Stock Units ( 7 ) ( 11 ) ( 11 ) Common Stock 634 D Restricted Stock Units ( 7 ) ( 12 ) ( 12 ) Common Stock 3,891 D Restricted Stock Units ( 7 ) ( 13 ) ( 13 ) Common Stock 9,713 D Restricted Stock Units ( 7 ) < span class="form4-data"> ( 14 ) ( 14 ) Common Stock 4,749 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other McLellan Philip D. 9975 SUMMERS RIDGE ROAD SAN DIEGO, CA92121 Chief Operations Officer Signatures /s/ Jennifer Ahn, attorney-in-fact for Philip D. McLellan 11/22/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Vested in full. ( 2 )1,014 shares are vested in full; the remaining 338 shares will vest on February 1, 2025. ( 3 )2,253 shares are vested in full: the remaining 2,254 shares will vest in equal installments on January 31, 2025 and January 31, 2026. ( 4 )1,945 shares are vested in full; 1,945 shares will vest on April 26, 2025 and 1,946 shares will vest on April 26, 2026. ( 5 )9,714 shares will vest in equal installments on April 22, 2025, April 22, 2026 and April 22, 2027. ( 6 )338 shares will vest on February 1, 2025. ( 7 )Each restricted stock unit represents the right to receive one share of QuidelOrtho Corporation common stock. ( 8 )420 shares will vest on May 25, 2025. ( 9 )2,254 shares will vest in equal installments on January 31, 2025 and January 31, 2026. ( 10 )846 shares will vest on January 31, 2025 and 847 shares will vest on January 31, 2026. ( 11 )Release of restricted stock units was deferred pursuant to QuidelOrtho's deferred compensation program applicable to participating employees and will occur according to the elected deferral schedule. ( 12 )1,945 shares will vest on April 26, 2025 and 1,946 shares will vest on April 26, 2026. ( 13 )3,237 shares will vest on April 22, 2025; 6,476 shares will vest in equal installments on April 22, 2026 and April 22, 2027. ( 14 )4,749 shares will vest on June 30, 2025.

Remarks: Exhibit 24.1 - Power of Attorney

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).

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