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 *

TANG KEVIN C
2. Issuer Name and Ticker or Trading Symbol

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

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

4747 EXECUTIVE DRIVE, SUITE 510
3. Date of Earliest Transaction (MM/DD/YYYY)

1/9/2020
(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)

___ Form filed by One Reporting Person
_ X _ 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 1/9/2020  P  599661 A$4.8031 (1)5538554 I (2)By LP (2)
Common Stock 1/9/2020  P  400339 A$5.2749 (3)5938893 I (2)By LP (2)
Common Stock 1/10/2020  P  717804 A$5.6992 (4)6656697 I (2)By LP (2)
Common Stock 1/13/2020  P  1253878 A$6.6606 (5)7910575 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

Explanation of Responses:
(1) The prices reported in Column 4 are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $4.25 to $5.25. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the SEC Staff, upon request, full information regarding the number of shares purchased at each price within the ranges set forth in footnotes 1 and 3 through 5 herein.
(2) The shares are beneficially owned by Tang Capital Partners, LP ("TCP"). Kevin Tang is the sole manager of Tang Capital Management, LLC, which is the general partner of TCP. Mr. Tang has a pecuniary interest in a portion of the shares beneficially held by TCP.
(3) The prices reported in Column 4 are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $5.255 to $5.30.
(4) The prices reported in Column 4 are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $5.11 to $6.00.
(5) The prices reported in Column 4 are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $6.01 to $7.00.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
TANG KEVIN C
4747 EXECUTIVE DRIVE, SUITE 510
SAN DIEGO, CA 92121
XX

TANG CAPITAL PARTNERS LP
4747 EXECUTIVE DRIVE, SUITE 510
SAN DIEGO, CA 92121

X

TANG CAPITAL MANAGEMENT LLC
4747 EXECUTIVE DRIVE, SUITE 510
SAN DIEGO, CA 92121

X


Signatures
/s/ Kevin Tang1/13/2020
**Signature of Reporting PersonDate

/s/ Kevin Tang, Managing Member of Tang Capital Management, LLC, General Partner1/13/2020
**Signature of Reporting PersonDate

/s/ Kevin Tang, Managing Member1/13/2020
**Signature of Reporting PersonDate

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