CUSIP No.
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68401H104
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13G
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Page 2 of 10 Pages
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1.
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NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Deerfield Mgmt, L.P.
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||
2.
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CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
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(a) o
(b) ý
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3.
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SEC USE ONLY
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||
4.
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CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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NUMBER OF SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
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5.
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SOLE VOTING POWER
0
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6.
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SHARED VOTING POWER
0
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||
7.
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SOLE DISPOSITIVE POWER
0
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||
8.
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SHARED DISPOSITIVE POWER
0
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||
9.
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AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
0
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||
10.
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CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
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¨
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11.
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PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.00%
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||
12.
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TYPE OF REPORTING PERSON*
PN
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CUSIP No.
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68401H104
|
13G
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Page 3 of 10 Pages |
1.
|
NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Deerfield Management Company, L.P.
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||
2.
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
|
(a) o
(b) ý
|
|
3.
|
SEC USE ONLY
|
||
4.
|
CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
|
||
NUMBER OF SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
|
5.
|
SOLE VOTING POWER
0
|
|
6.
|
SHARED VOTING POWER
0
|
||
7.
|
SOLE DISPOSITIVE POWER
0
|
||
8.
|
SHARED DISPOSITIVE POWER
0
|
||
9.
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AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
0
|
||
10.
|
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
|
¨
|
|
11.
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.00%
|
||
12.
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TYPE OF REPORTING PERSON*
PN
|
CUSIP No.
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68401H104
|
13G
|
Page 4 of 10 Pages |
1.
|
NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Deerfield Partners, L.P.
|
||
2.
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
|
(a) o
(b) ý
|
|
3.
|
SEC USE ONLY
|
||
4.
|
CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
|
||
NUMBER OF SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
|
5.
|
SOLE VOTING POWER
0
|
|
6.
|
SHARED VOTING POWER
0
|
||
7.
|
SOLE DISPOSITIVE POWER
0
|
||
8.
|
SHARED DISPOSITIVE POWER
0
|
||
9.
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
0
|
||
10.
|
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
|
¨
|
|
11.
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.00%
|
||
12.
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TYPE OF REPORTING PERSON*
PN
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CUSIP No.
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68401H104
|
13G
|
Page 5 of 10 Pages |
1.
|
NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Deerfield International Master Fund, L.P.
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||
2.
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
|
(a) o
(b) ý
|
|
3.
|
SEC USE ONLY
|
||
4.
|
CITIZENSHIP OR PLACE OF ORGANIZATION
British Virgin Islands
|
||
NUMBER OF SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
|
5.
|
SOLE VOTING POWER
0
|
|
6.
|
SHARED VOTING POWER
0
|
||
7.
|
SOLE DISPOSITIVE POWER
0
|
||
8.
|
SHARED DISPOSITIVE POWER
0
|
||
9.
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
0
|
||
10.
|
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
|
¨
|
|
11.
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.00%
|
||
12.
|
TYPE OF REPORTING PERSON*
PN
|
CUSIP No.
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68401H104
|
13G
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Page 6 of 10 Pages |
1.
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NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
James E. Flynn
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||
2.
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
|
(a) o
(b) ý
|
|
3.
|
SEC USE ONLY
|
||
4.
|
CITIZENSHIP OR PLACE OF ORGANIZATION
United States
|
||
NUMBER OF SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
|
5.
|
SOLE VOTING POWER
0
|
|
6.
|
SHARED VOTING POWER
0
|
||
7.
|
SOLE DISPOSITIVE POWER
0
|
||
8.
|
SHARED DISPOSITIVE POWER
0
|
||
9.
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
0
|
||
10.
|
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
|
¨
|
|
11.
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.00%
|
||
12.
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TYPE OF REPORTING PERSON*
IN
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CUSIP No.
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68401H104
|
13G
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Page 7 of 10 Pages |
Item 1(a). | Name of Issuer: | |
Optimer Pharmaceuticals, Inc.
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Item 1(b). | Address of Issuer's Principal Executive Offices: | |
101 Hudson Street, Suite 3501
Jersey City, NJ 07302
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Item 2(a). | Name of Person Filing: | |
James E. Flynn, Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P., Deerfield International Master Fund, L.P.
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Item 2(b). | Address of Principal Business Office, or if None, Residence: | |
780 Third Avenue, 37th Floor, New York, NY 10017
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Item 2(c). | Citizenship: | |
Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P. - Delaware limited partnerships;
Deerfield International Master Fund, L.P. – British Virgin Islands limited partnership;
James E. Flynn - United States citizen
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Item 2(d). | Title of Class of Securities: | |
Common Stock
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Item 2(e). | CUSIP Number: | |
68401H104
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Item 3. |
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(a) | o | Broker or dealer registered under Section 15 of the Exchange Act. | |
(b) | o | Bank as defined in Section 3(a)(6) of the Exchange Act. | |
(c) | o | Insurance company as defined in Section 3(a)(19) of the Exchange Act. | |
(d) | o | Investment company registered under Section 8 of the Investment Company Act. |
(e) | o | An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E); |
(f) | o | An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F); | |
(g) | o | A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G); |
(h) | o | A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act; |
(i) | o | A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; | |
(j) | o |
A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J);
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CUSIP No.
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68401H104
|
13G
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Page 8 of 10 Pages |
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(k) | o |
Group, in accordance with Rule 13d-1(b)(1)(ii)(K).
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Item 4. | Ownership. |
(a) |
Amount beneficially owned**:
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||
Deerfield Mgmt, L.P. – 0 shares
Deerfield Management Company, L.P. – 0 shares
Deerfield Partners, L.P. – 0 shares
Deerfield International Master Fund, L.P. - 0 shares
James E. Flynn – 0 shares
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|||
(b) |
Percent of class**:
|
||
Deerfield Mgmt, L.P. – 0.00%
Deerfield Management Company, L.P. – 0.00%
Deerfield Partners, L.P. – 0.00%
Deerfield International Master Fund, L.P. - 0.00%
James E. Flynn – 0.00%
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(c) |
Number of shares as to which such person has**:
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(i) | Sole power to vote or to direct the vote |
All Reporting Persons - 0
|
|||
(ii) | Shared power to vote or to direct the vote |
Deerfield Mgmt, L.P. – 0
Deerfield Management Company, L.P. – 0
Deerfield Partners, L.P. – 0
Deerfield International Master Fund, L.P. – 0
James E. Flynn - 0
|
(iii) |
Sole power to dispose or to direct the disposition of
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All Reporting Persons - 0
|
|||
(iv) |
Shared power to dispose or to direct the disposition of
|
Deerfield Mgmt, L.P. – 0
Deerfield Management Company, L.P. – 0
Deerfield Partners, L.P. – 0
Deerfield International Master Fund, L.P. – 0
James E. Flynn - 0
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CUSIP No.
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68401H104
|
13G
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Page 9 of 10 Pages |
Item 5.
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Ownership of Five Percent or Less of a Class.
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Item 6.
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Ownership of More Than Five Percent on Behalf of Another Person. |
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N/A
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Item 7.
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Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
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N/A
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Item 8.
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Identification and Classification of Members of the Group. |
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See Exhibit B
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Item 9.
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Notice of Dissolution of Group. |
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N/A
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Item 10.
|
Certifications. |
CUSIP No.
|
68401H104
|
13G
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Page 10 of 10 Pages |