Sec Form 3 Filing - Ranalli Tamara A. @ QUIDEL CORP /DE/ - 2020-08-24

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 Ranalli Tamara A. 2. Issuer Name and Ticker or Trading Symbol QUIDEL CORP /DE/ [ QDEL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP, Molecular Bus. Unit (Last) (First) (Middle) 9975 SUMMERS RIDGE ROAD 3. Date of Earliest Transaction (MM/DD/YY) 08/24/2020 (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 8,854 D

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 (Right to Buy) $ 22.1 ( 1 ) 02/25/2023 Common Stock 3,194 D Non-Qualified Stock Options (Right to Buy) $ 27.57 ( 2 ) 02/24/2024 Common Stock 6,360 D Non-Qualified Stock Options (Right to Buy) $ 23.41 ( 3 ) 02/05/2025 Common Stock 3,910 D Non-Qualified Stock Options (Right to Buy) $ 15.4 ( 4 ) 02/10/2026 Common Stock 1,954 D Non-Qualified Stock Options (Right to Buy) $ 21.08 ( 5 ) 02/15/2027 Common Stock 1,349 D Non-Qualified Stock Options (Right to Buy) $ 46.41 ( 6 ) 01/16/2028 Common Stock 3,455 D Non-Qualified Stock Options (Right to Buy) $ 59.12 ( 7 ) 02/04/2029 Common Stock 3,020 D Non-Qualified Stock Options (Right to Buy) $ 77.16 ( 8 ) 02/03/2030 Common Stock 2,372 D Restricted Stock Units ( 9 ) 02/15/2021 02/15/2021 Common Stock 675 D Restricted Stock Units ( 9 ) 10/05/2021 10/05/2021 Common Stock 2,000 D Restricted Stock Units ( 9 ) 01/16/2022 01/16/2022 Common Stock 1,727 D Restricted Stock Units ( 9 ) 02/04/2023 02/04/2023 Common Stock 1,510 D Restricted Stock Units ( 9 ) ( 10 ) ( 10 ) Common Stock 2,372 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Ranalli Tamara A. 9975 SUMMERS RIDGE ROAD SAN DIEGO, CA92121 SVP, Molecular Bus. Unit < /td> Signatures Robert J. Bujarski, attorney-in-fact for Tamara A. Ranalli 08/26/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The shares were fully vested on February 24, 2017. ( 2 )The shares were fully vested on February 24, 2018. ( 3 )1,956 shares vested on February 5, 2017; 977 shares vested on February 5, 2018; and 977 shares vested on February 5, 2019. ( 4 )1,956 shares vested on February 10, 2018; 977 shares vested on February 10, 2019; and 977 shares vested on February 10, 2020. ( 5 )675 shares vested on February 15, 2019; 337 shares vested on February 15, 2020; and 337 shares will vest on February 15, 2021. ( 6 )1,728 shares vested on January 16, 2020; 864 shares will vest on January 16, 2021; and 863 shares will vest on January 16, 2022. ( 7 )1,510 shares will vest on February 4, 2021; 755 shares will vest on February 4, 2022; and 755 shares will vest on February 4, 2023. ( 8 )593 shares will vest on February 3, 2021; 593 shares will vest on February 3, 2022; 593 shares will vest on February 3, 2023; and 593 shares will vest on February 3, 2024. ( 9 )Each restricted stock unit represents the right to receive one share of Quidel Corporation common stock. ( 10 )593 shares will vest on February 3, 2021; 593 shares will vest on February 3, 2022; 593 shares will vest on February 3, 2023; and 593 shares will vest on February 3, 2024.

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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