FORM 4 [ ] 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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Hearne Michael S
2. Issuer Name and Ticker or Trading Symbol

LA JOLLA PHARMACEUTICAL CO [ LJPC ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Financial Officer
(Last)          (First)          (Middle)

C/O LA JOLLA PHARMACEUTICAL COMPANY, 4747 EXECUTIVE DRIVE, SUITE 240
3. Date of Earliest Transaction (MM/DD/YYYY)

2/12/2021
(Street)

SAN DIEGO, CA 92121
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 2/12/2021  A(1)  535 A$5.7035 3224 D  
Common Stock         9405490 I (2)By LP (2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Employee Stock Option (Right to Buy) $6.71 2/12/2021  A   535     (3)2/12/2031 Common Stock 535.0 $0 535 D  

Explanation of Responses:
(1) These shares were acquired on 2/12/2021 through the La Jolla Pharmaceutical Company 2018 Employee Stock Purchase Plan in a transaction that was exempt under both Rule 16b-3(d) and Rule 16b-3(c).
(2) The securities are beneficially owned by Tang Capital Partners, LP ("TCP"). Tang Capital Management, LLC ("TCM") is the general partner of TCP. Michael Hearne is the Chief Financial Officer of La Jolla Pharmaceutical Company, as well as the Chief Financial Officer of TCM. Mr. Hearne has a pecuniary interest in a portion of the shares beneficially held by TCP.
(3) The stock options vest and become exercisable with respect to 25% of the underlying shares on the one-year anniversary of the grant date and then vest and become exercisable ratably on a monthly basis over the next three years.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Hearne Michael S
C/O LA JOLLA PHARMACEUTICAL COMPANY
4747 EXECUTIVE DRIVE, SUITE 240
SAN DIEGO, CA 92121


Chief Financial Officer

Signatures
/s/ Michael Hearne2/18/2021
**Signature of Reporting PersonDate

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