Sec Form 4 Filing - LICHTINGER PEDRO @ OPTIMER PHARMACEUTICALS INC - 2013-04-08

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 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 LICHTINGER PEDRO 2. Issuer Name and Ticker or Trading Symbol OPTIMER PHARMACEUTICALS INC [ OPTR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) X __ Other (specify below) Former CEO (Last) (First) (Middle) 7211 EADS AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 04/08/2013 (Street) LA JOLLA, CA92037 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 04/08/2013 M 58,000 A $ 11.41 162,078 D Common stock 04/08/2013 M 90,000 A $ 13.51 252,078 D Common stock 04/08/2013 S 58,000 D $ 14.6285 194,078 D Common stock ( 3 ) 04/08/2013 S 90,000 D $ 14.7282 104,078 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 Stock option (right to buy) $ 11.41 04/08/2013 M 58,000 ( 1 ) 05/26/2013 Common stock 58,000 $ 0 0 D Stock option (right to buy) $ 13.51 04/08/2013 M 90,000 ( 2 ) 05/26/2013 Common stock 90,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LICHTINGER PEDRO 7211 EADS AVENUE LA JOLLA, CA92037 Former CEO Signatures Pedro Lichtinger 04/10/2013 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On January 26, 2011, the reporting person was granted an option to purchase 58,000 shares of common stock. 1/4 of the shares subject to the option vested on January 1, 2012. Thereafter, the remaining shares subject to the option were scheduled to vest and become exercisable in 36 equal montly installments subject to the reporting person continuing to be service provider on each such date. At the time the reporting person's service was terminated in February 2013, the option: (i) had vested as to 30,208 shares; and (ii) was accelerated as to 27,792 shares in accordance with the reporting person's separation agreement. ( 2 )On February 7, 2012, the reporting person was granted an option to purchase 120,000 shares of common stock. 1/4 of the shares subject to the option vested on February 7, 2013. Thereafter, the remaining shares subject to the option were scheduled to vest and become exercisable in 36 monthly installments subject to the reporting person continuing to be service provider on each such date. At the time the reporting person's service was terminated in February 2013, the option: (i) had vested as to 30,000 shares; (ii) was accelerated as to 60,000 shares in accordance with the reporting person's separation agreement; and (iii) was cancelled as to the remaining 30,000 shares. ( 3 )Without admitting any legal obligation, the reporting person has agreed to remit to the Company appropriate profits realized for purposes of Section 16(b) of the Securities and Exchange Act of 1934, as amended.

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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