horizon.htm


   
   
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC  20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1)   *


Horizon Pharma, Inc.
(Name of Issuer)
 
Common Stock, par value $0.0001 per share
(Title of Class of Securities)
 
44047T109
(Cusip Number)
 
September 20, 2012
(Date of Event which Requires Filing of this Statement)
 
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o           Rule 13d-1(b)
x           Rule 13d-1(c)
o           Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).










(Continued on following pages)
Page  1 of 29 Pages
Exhibit Index Found on Page 28

 
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
FHP Pharma, L.L.C.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, is a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
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
 
1,883,071
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
1,883,071
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
1,883,071
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
3.3%
12
TYPE OF REPORTING PERSON (See Instructions)
 
OO

 
Page 2 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital Partners, L.P.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
3
SEC USE ONLY
 
4
CITIZENSHIP OR PLACE OF ORGANIZATION
 
California
NUMBER OF
 
SHARES BENEFICIALLY
OWNED BY
 
EACH
 
REPORTING  PERSON WITH
5
SOLE VOTING POWER
 
-0-
6
SHARED VOTING POWER
 
160,400
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
160,400
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
160,400
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.3%
12
TYPE OF REPORTING PERSON (See Instructions)
 
PN

 
Page 3 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital Institutional Partners, L.P.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
3
SEC USE ONLY
 
4
CITIZENSHIP OR PLACE OF ORGANIZATION
 
California
NUMBER OF
 
SHARES BENEFICIALLY
OWNED BY
 
EACH
 
REPORTING  PERSON WITH
5
SOLE VOTING POWER
 
-0-
6
SHARED VOTING POWER
 
181,500
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
181,500
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
181,500
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.3%
12
TYPE OF REPORTING PERSON (See Instructions)
 
PN

 
Page 4 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital Institutional Partners II, L.P.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
3
SEC USE ONLY
 
4
CITIZENSHIP OR PLACE OF ORGANIZATION
 
California
NUMBER OF
 
SHARES BENEFICIALLY
OWNED BY
 
EACH
 
REPORTING  PERSON WITH
5
SOLE VOTING POWER
 
-0-
6
SHARED VOTING POWER
 
9,800
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
9,800
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
9,800
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.0%
12
TYPE OF REPORTING PERSON (See Instructions)
 
PN

 
Page 5 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital Institutional Partners III, L.P.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
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
 
16,300
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
16,300
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
16,300
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.0%
12
TYPE OF REPORTING PERSON (See Instructions)
 
PN

 
Page 6 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital Offshore Investors II, L.P.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
3
SEC USE ONLY
 
4
CITIZENSHIP OR PLACE OF ORGANIZATION
 
Cayman Islands
NUMBER OF
 
SHARES BENEFICIALLY
OWNED BY
 
EACH
 
REPORTING  PERSON WITH
5
SOLE VOTING POWER
 
-0-
6
SHARED VOTING POWER
 
263,716
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
263,716
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
263,716
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
PN


 
Page 7 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital (AM) Investors, L.P.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
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
 
6,500
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
6,500
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
6,500
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.0%
12
TYPE OF REPORTING PERSON (See Instructions)
 
PN


 
Page 8 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Capital Management, L.L.C.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
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
 
1,892,871
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
1,892,871
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
1,892,871
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
3.3%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IA, OO

 
Page 9 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Farallon Partners, L.L.C.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by it on this cover page.  [See Preliminary Note]
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
 
638,216
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
638,216
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
638,216
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
1.1%
12
TYPE OF REPORTING PERSON (See Instructions)
 
OO

 
Page 10 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Richard B. Fried
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN


 
Page 11 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Daniel J. Hirsch
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN

 
Page 12 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Monica R. Landry
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by her on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN

 
Page 13 of 29
 


13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Michael G. Linn
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN


 
Page 14 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Stephen L. Millham
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN

 
Page 15 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Rajiv A. Patel
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN


 
Page 16 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Thomas G. Roberts, Jr.
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN

 
Page 17 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Andrew J. M. Spokes
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
3
SEC USE ONLY
 
4
CITIZENSHIP OR PLACE OF ORGANIZATION
 
United Kingdom
NUMBER OF
 
SHARES BENEFICIALLY
OWNED BY
 
EACH
 
REPORTING  PERSON WITH
5
SOLE VOTING POWER
 
-0-
6
SHARED VOTING POWER
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN

 
Page 18 of 29
 
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Thomas F. Steyer
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN


 
Page 19 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
John R. Warren
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN


 
Page 20 of 29
 

13G
CUSIP No. 44047T109
  

1
NAMES OF REPORTING PERSONS
 
Mark C. Wehrly
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)            
                                                                                                                                                      (a) [     ]
                                                                                                                                                      (b) [ X ]**
**    The reporting persons making this filing hold an aggregate of 2,531,087 Shares, which is 4.5% of the class of securities.  The reporting person on this cover page, however, may be deemed a beneficial owner only of the securities reported by him on this cover page.  [See Preliminary Note]
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
 
2,531,087
7
SOLE DISPOSITIVE POWER
 
-0-
8
SHARED DISPOSITIVE POWER
 
2,531,087
9
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
2,531,087
10
CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES (See Instructions)                         
                                                                                                                                                            [     ]
 
11
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
4.5%
12
TYPE OF REPORTING PERSON (See Instructions)
 
IN


 
Page 21 of 29
 

 
 
This Amendment No. 1 to Schedule 13G amends and restates in its entirety the Schedule 13G initially filed on September 17, 2012 (together with all prior and current amendments thereto, this “Schedule 13G”).

Preliminary Note:  The Reporting Persons (as defined below) are filing this Schedule 13G with respect to the Common Stock, par value $0.0001 per share (the “Shares”), of Horizon Pharma, Inc. (the “Company”).  Certain of the Reporting Persons own, in aggregate, (i) 2,281,087 Shares and (ii) currently exercisable warrants, issued by the Company, to purchase 250,000 Shares (the “Warrants”).  Unless stated otherwise, all numbers and percentages contained in this Schedule 13G represent Shares currently held by certain Reporting Persons and all Shares that would be issued to certain Reporting Persons assuming full exercise of the Warrants beneficially owned by such Reporting Persons.  Such numbers and percentages do not reflect the exercise of Warrants beneficially owned by any persons other than the Reporting Person(s).

Item 1.     Issuer

(a)           Name of Issuer:

Horizon Pharma, Inc.

(b)           Address of Issuer’s Principal Executive Offices:

520 Lake Cook Road, Suite 520, Deerfield, Illinois 60015

Item 2.     Identity and Background

Title of Class of Securities and CUSIP Number (Items 2(d) and (e))

This statement relates to the Shares of the Company.  The CUSIP number of the Shares is 44047T109.

Name of Persons Filing, Address of Principal Business Office and Citizenship (Items 2(a), (b) and (c))

This statement is filed by the entities and persons listed below, all of whom together are referred to herein as the “Reporting Persons.”

The Farallon SPV

(i)  
FHP Pharma, L.L.C., a Delaware limited liability company (the “Farallon SPV”), with respect to the Shares held by it.

The Farallon Funds

(ii)  
Farallon Capital Partners, L.P., a California limited partnership (“FCP”), with respect to the Shares beneficially owned by it;

(iii)  
Farallon Capital Institutional Partners, L.P., a California limited partnership (“FCIP”), with respect to the Shares beneficially owned by it;

 
Page 22 of 29
 
 
(iv)  
Farallon Capital Institutional Partners II, L.P., a California limited partnership (“FCIP II”), with respect to the Shares beneficially owned by it;

(v)  
Farallon Capital Institutional Partners III, L.P., a Delaware limited partnership (“FCIP III”), with respect to the Shares beneficially owned by it;

(vi)  
Farallon Capital Offshore Investors II, L.P., a Cayman Islands exempted limited partnership (“FCOI II”), with respect to the Shares beneficially owned by it; and

(vii)  
Farallon Capital (AM) Investors, L.P., a Delaware limited partnership (“FCAMI”), with respect to the Shares beneficially owned by it.
 
 
FCP, FCIP, FCIP II, FCIP III, FCOI II and FCAMI are together referred to herein as the “Farallon Funds.”  The Farallon SPV and the Farallon Funds are together referred to herein as the “Funds.”

The Management Company

(viii)  
Farallon Capital Management, L.L.C., a Delaware limited liability company (the “Management Company”), with respect to the Shares beneficially owned by one or more accounts (the “Managed Accounts”), each as managed by the Management Company, and with respect to the Shares held by the Farallon SPV, of which it is the manager.

The Farallon General Partner

(ix)  
Farallon Partners, L.L.C., a Delaware limited liability company (the “Farallon General Partner”), which is the general partner of each of the Farallon Funds, with respect to the Shares beneficially owned by each of the Farallon Funds.

The Farallon Managing Members

(x)  
The following persons, each of whom is a managing member of both the Farallon General Partner and the Management Company, with respect to the Shares beneficially owned by the Funds and the Managed Accounts:  Richard B. Fried (“Fried”), Daniel J. Hirsch (“Hirsch”), Monica R. Landry (“Landry”), Michael G. Linn (“Linn”), Stephen L. Millham (“Millham”), Rajiv A. Patel (“Patel”), Thomas G. Roberts, Jr. (“Roberts”), Andrew J. M. Spokes (“Spokes”), Thomas F. Steyer (“Steyer”), John R. Warren (“Warren”) and Mark C. Wehrly (“Wehrly”).

Fried, Hirsch, Landry, Linn, Millham, Patel, Roberts, Spokes, Steyer, Warren and Wehrly are together referred to herein as the “Farallon Individual Reporting Persons.”

The citizenship of each of the Funds, the Management Company and the Farallon General Partner is set forth above.  Each of the Farallon Individual Reporting Persons, other than
 
 
Page 23 of 29
 
Spokes, is a citizen of the United States.  Spokes is a citizen of the United Kingdom.  The address of the principal business office of each of the Reporting Persons is c/o Farallon Capital Management, L.L.C., One Maritime Plaza, Suite 2100, San Francisco, California 94111.

Item 3.
If This Statement Is Filed Pursuant to Sections 240.13d-1(b) or 240.13d-2(b) or (c). Check Whether the Person Filing Is an Entity Specified in (a) - (k):

Not applicable.

Item 4.     Ownership

The information required by Items 4(a) - (c) and set forth in Rows 5 through 11 of the cover page for each Reporting Person hereto is incorporated herein by reference for each such Reporting Person.

The Shares reported hereby for the Funds are beneficially owned directly by the Funds and those reported by the Management Company on behalf of the Managed Accounts are beneficially owned directly by the Managed Accounts.  The Management Company, as investment adviser to the Managed Accounts and as the manager of the Farallon SPV, may be deemed to be a beneficial owner of all such Shares beneficially owned by the Managed Accounts and the Farallon SPV.  The Farallon General Partner, as general partner of the Farallon Funds, may be deemed to be a beneficial owner of all such Shares beneficially owned by the Farallon Funds.  The Farallon Individual Reporting Persons, as managing members of both the Farallon General Partner and the Management Company with the power to exercise investment discretion, may each be deemed to be a beneficial owner of all such Shares beneficially owned by the Funds and the Managed Accounts.  Each of the Management Company, the Farallon General Partner and the Farallon Individual Reporting Persons hereby disclaims any beneficial ownership of any such Shares.

Item 5.     Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof each of the Reporting Persons has ceased to be a beneficial owner of more than five percent of the class of securities, check the following [ X ].

Item 6.     Ownership of More than Five Percent on Behalf of Another Person

Not applicable.

Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being
Reported on by the Parent Holding Company or Control Person
 

 Not applicable.

Item 8.
Identification and Classification of Members of the Group

The Reporting Persons are filing this Schedule 13G pursuant to Section 240.13d-1(c).  Consistent with Item 2 of the cover page for each Reporting Person above, the Reporting Persons neither disclaim nor affirm the existence of a group among them.

 
Page 24 of 29
 
Item 9.      Notice of Dissolution of Group

Not applicable.

Item 10.    Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

 
Page 25 of 29
 

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

Dated:  September 27, 2012


/s/ Monica R. Landry                                                            
FARALLON PARTNERS, L.L.C.,
On its own behalf and
As the General Partner of
FARALLON CAPITAL PARTNERS, L.P.,
FARALLON CAPITAL INSTITUTIONAL PARTNERS, L.P.,
FARALLON CAPITAL INSTITUTIONAL PARTNERS II, L.P.,
FARALLON CAPITAL INSTITUTIONAL PARTNERS III, L.P.,
FARALLON CAPITAL OFFSHORE INVESTORS II, L.P. and
FARALLON CAPITAL (AM) INVESTORS, L.P.
By Monica R. Landry, Managing Member


/s/ Monica R. Landry                                                            
FARALLON CAPITAL MANAGEMENT, L.L.C.,
On its own behalf and
As the Manager of
FHP PHARMA, L.L.C.
By Monica R. Landry, Managing Member


/s/ Monica R. Landry                                                            
Monica R. Landry, individually and as attorney-in-fact for each of Richard B. Fried, Daniel J. Hirsch, Michael G. Linn, Stephen L. Millham, Rajiv A. Patel, Thomas G. Roberts, Jr., Andrew J. M. Spokes, Thomas F. Steyer, John R. Warren and  Mark C. Wehrly

The Power of Attorney executed by each of Fried, Millham, Patel, Steyer and Wehrly authorizing Landry to sign and file this Schedule 13G on his behalf, which was filed with the Schedule 13D filed with the Securities and Exchange Commission on July 2, 2007 by such Reporting Persons with respect to the Common Stock of Armor Holdings, Inc., is hereby incorporated by reference.  The Power of Attorney executed by Spokes authorizing Landry to sign and file this Schedule 13G on his behalf, which was filed with the Schedule 13D filed with the Securities and Exchange Commission on August 28, 2007 by such Reporting Person with respect to the Common Stock of Global Gold Corporation, is hereby incorporated by reference.  The Power of Attorney executed by Hirsch authorizing Landry to sign and file this Schedule 13G on his behalf, which was filed with Amendment No. 1 to the Schedule 13D filed with the Securities and Exchange Commission on January 6, 2009 by such Reporting Person with respect to the Common Stock of Town Sports International Holdings, Inc., is hereby incorporated by reference.  The Power of Attorney executed by Roberts authorizing Landry to sign and file this Schedule 13G on his behalf, which was filed with Amendment No. 2 to the Schedule 13G filed with the Securities and Exchange Commission on April 23, 2010 by such Reporting Person with respect to the Common Stock of Energy Partners, Ltd., is hereby incorporated by reference.  The
 
 
Page 26 of 29
 
 
Power of Attorney executed by Linn authorizing Landry to sign and file this Schedule 13G on his behalf, which was filed with the Schedule 13D filed with the Securities and Exchange Commission on July 8, 2010 by such Reporting Person with respect to the Common Stock of Hudson Pacific Properties, Inc., is hereby incorporated by reference.  The Power of Attorney executed by Warren authorizing Landry to sign and file this Schedule 13G on his behalf, which was filed with Amendment No. 11 to the Schedule 13D filed with the Securities and Exchange Commission on January 11, 2011 by such Reporting Person with respect to the Class A Subordinate Voting Shares of MI Developments Inc., is hereby incorporated by reference.




 
Page 27 of 29
 

EXHIBIT INDEX


EXHIBIT 2
Joint Acquisition Statement Pursuant to Section 240.13d-1(k)
 


 
Page 28 of 29
 

EXHIBIT 2
to
SCHEDULE 13G

JOINT ACQUISITION STATEMENT
PURSUANT TO SECTION 240.13d-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements.  The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him, her or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the other entities or persons, except to the extent that he, she or it knows or has reason to believe that such information is inaccurate.

Dated:  September 27, 2012


/s/ Monica R. Landry                                                         
FARALLON PARTNERS, L.L.C.,
On its own behalf and
As the General Partner of
FARALLON CAPITAL PARTNERS, L.P.,
FARALLON CAPITAL INSTITUTIONAL PARTNERS, L.P.,
FARALLON CAPITAL INSTITUTIONAL PARTNERS II, L.P.,
FARALLON CAPITAL INSTITUTIONAL PARTNERS III, L.P.,
FARALLON CAPITAL OFFSHORE INVESTORS II, L.P. and
FARALLON CAPITAL (AM) INVESTORS, L.P.
By Monica R. Landry, Managing Member


/s/ Monica R. Landry                                                         
FARALLON CAPITAL MANAGEMENT, L.L.C.,
On its own behalf and
As the Manager of
FHP PHARMA, L.L.C.
By Monica R. Landry, Managing Member


/s/ Monica R. Landry                                                         
Monica R. Landry, individually and as attorney-in-fact for each of Richard B. Fried, Daniel J. Hirsch, Michael G. Linn, Stephen L. Millham, Rajiv A. Patel, Thomas G. Roberts, Jr., Andrew J. M. Spokes, Thomas F. Steyer, John R. Warren and  Mark C. Wehrly



 
Page 29 of 29