SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* SOFINNOVA CAPITAL VI FCPR (Last) (First) (Middle) 17, RUE DE SERENE (Street) PARIS I0 75008 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 04/11/2013	3. Issuer Name and Ticker or Trading Symbol Omthera Pharmaceuticals, Inc. [ OMTH ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series A Convertible Preferred Stock	(1)	(3)	Common Stock	3,117,609	(3)	D(4)
Series B Convertible Preferred Stock	(2)	(3)	Common Stock	2,627,435	(3)	D(4)

1. Name and Address of Reporting Person* SOFINNOVA CAPITAL VI FCPR (Last) (First) (Middle) 17, RUE DE SERENE (Street) PARIS I0 75008 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Sofinnova Partners SAS (Last) (First) (Middle) 17, RUE DE SERENE (Street) PARIS I0 75008 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. The Series A Convertible Preferred Shares (the "Series A Shares") were issued in three tranches on November 13, 2009, February 10, 2010 and July 14, 2010. The Series A Shares are convertible, in accordance with the Issuer's Amended and Restated Certificate of Incorporation, at any time after the issuance of such share, at the holder's election.

2. The Series B Convertible Preferred Shares (the "Series B Shares" and collectively with the Series A Shares, the "Preferred Shares") were issued in four tranches on February 28, 2011, December 22, 2011, April 3, 2012 and July 14, 2012. The Series B Shares are convertible, in accordance with the Issuer's Amended and Restated Certificate of Incorporation, at any time after the issuance of such share, at the holder's election.

3. The Preferred Shares will convert automatically into Common Stock, without the payment of additional consideration, upon the closing of the Issuer's initial public offering and do not have an expiration date. The Preferred Shares will convert on a 1.3953-for-1 basis into the number of shares of Common Stock as shown in column 3.

4. Sofinnova Partners SAS is the managing company of Sofinnova Capital VI FCPR and disclaims beneficial ownership of these shares except to the extent of its pecuniary interest therein, if any.

	/s/Christian S. Schade, Attorney-in-Fact	04/11/2013
	/s/Christian S. Schade, Attorney-in-Fact	04/11/2013
	** Signature of Reporting Person	Date
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