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 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 * Scale Venture Partners II, LP   2. Issuer Name and Ticker or Trading Symbol HORIZON PHARMA, INC. [HZNP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SCALE VENTURE MANAGEMENT II, LLC, 950 TOWER LANE, SUITE 700 3. Date of Earliest Transaction (Month/Day/Year) 08/02/2011 (Street) FOSTER CITY, CA 94404 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 08/02/2011   C   1,370,070 (1) A (1) 1,370,070 D (2)   Common Stock 08/02/2011   C   171,626 (1) A (1) 1,541,696 D (2)   Common Stock 08/02/2011   C   346,823 (3) A $ 9 1,888,519 D (2)   Common Stock 08/02/2011   P   315,946 A $ 9 2,204,465 D (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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
Series A Convertible Preferred Stock	(1)	08/02/2011		C			3,252,547	(4)	(4)	Common Stock	1,370,070	$ 0	0	D (2)
Series B Convertible Preferred Stock	(1)	08/02/2011		C			407,440	(4)	(4)	Common Stock	171,626	$ 0	0	D (2)
Convertible Promissory Notes	$ 9	08/02/2011		C			$ 3,121,425.62	(5)	(5)	Common Stock	346,823	$ 0	0	D (2)
Warrant to Purchase Series A Preferred Stock	$ 5.201	08/02/2011		C(6)			69,451	(7)	10/31/2015(7)	Series A Preferred Stock	69,451	$ 0	0	D (2)
Warrant to Purchase Series A Preferred Stock	$ 5.201	08/02/2011		C(6)			34,726	(7)	07/02/2016(7)	Series A Preferred Stock	34,726	$ 0	0	D (2)
Warrant to Purchase Series A Preferred Stock	$ 5.201	08/02/2011		C(6)			43,409	(7)	09/25/2016(7)	Series A Preferred Stock	43,409	$ 0	0	D (2)
Warrant to Purchase Common Stock	$ 12.35	08/02/2011		C(6)		29,254		(7)	10/31/2015(7)	Common Stock	29,254	$ 0	29,254	D (2)
Warrant to Purchase Common Stock	$ 12.35	08/02/2011		C(6)		14,627		(7)	07/02/2016(7)	Common Stock	14,627	$ 0	14,627	D (2)
Warrant to Purchase Common Stock	$ 12.35	08/02/2011		C(6)		18,285		(7)	09/25/2016(7)	Common Stock	18,285	$ 0	18,285	D (2)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Scale Venture Partners II, LP C/O SCALE VENTURE MANAGEMENT II, LLC 950 TOWER LANE, SUITE 700 FOSTER CITY, CA 94404		X
Scale Venture Management II, LLC 950 TOWER LANE, SUITE 700 FOSTER CITY, CA 94404		X
MITCHELL KATE C/O SCALE VENTURE MANAGEMENT II, LLC 950 TOWER LANE, SUITE 700 FOSTER CITY, CA 94404		X
O'Driscoll Rory C/O SCALE VENTURE MANAGEMENT II, LLC 950 TOWER LANE, SUITE 700 FOSTER CITY, CA 94404		X
Wienbar Sharon L C/O SCALE VENTURE MANAGEMENT II, LLC 950 TOWER LANE, SUITE 700 FOSTER CITY, CA 94404		X

Signatures

By: Scale Venture Management II, LLC, its General Partner, by: Kate Mitchell, Managing Member, /s/ Kate Mitchell		08/04/2011
**Signature of Reporting Person		Date
/s/ Kate Mitchell, Managing Member		08/04/2011
**Signature of Reporting Person		Date
/s/ Kate Mitchell		08/04/2011
**Signature of Reporting Person		Date
/s/ Rory O'Driscoll		08/04/2011
**Signature of Reporting Person		Date
/s/ Sharon Wienbar		08/04/2011
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Automatic conversion, in connection with the Issuer's initial public offering, of preferred sock into shares of common stock. Every 2.374 shares of preferred stock converted into one share of common stock upon the closing of the Issuer's initial public offering.
(2)	The securities are held directly by Scale Venture Partners II, LP ("Scale Partners"). The General Partner of Scale Partners is Scale Venture Management II, LLC ("Scale Management"). The managing members of Scale Management share voting and investment power with respect to these shares. Each of the managing members of Scale Management disclaims beneficial ownership with respect to these securities except to the extent of his or her respective proportinate pecuniary interest therein.
(3)	Represents shares acquired upon conversion, in connection with the Issuer's initial public offering, of convertible promissory notes.
(4)	These securities are preferred stock of the Issuer and did not have an expiration date. Prior to the Issuer's initial public offering of common stock, the securities were convertible at any time at the election of the holder. The securities automatically converted into shares of common stock upon the closing of the issuer's initial public offering of common stock.
(5)	Principal and accrued interest converted upon the Issuer's initial public offering of common stock, into shares of common stock.
(6)	Automatic conversion, in connection with the Issuer's initial public offering, of warrants to purchase Series A Preferred Stock into warrants to purchase Common Stock. The warrants converted at a rate of 2.374 shares of Series A Preferred Stock to 1 share of Common Stock.
(7)	The warrants are immediately exercisable and shall terminate on the earlier of the expiration date referenced herein or the occurence of other specified corporate transactions.

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