Edgar Filing: IRONWOOD PHARMACEUTICALS INC

Ownership Submission

FORM 5

	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
	Form 3 Holdings Reported
	Form 4 Transactions Reported

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
ANNUAL 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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3235-0362

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1. Name and Address of Reporting Person ^*

Ridgeback Capital Investments L.P.

2. Issuer Name and Ticker or Trading Symbol
IRONWOOD PHARMACEUTICALS INC [IRWD]

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)

430 PARK AVENUE,Â 12TH FLOOR

3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2011

(Street)

NEW YORK,Â NYÂ 10022

4. If Amendment, Date Original Filed(Month/Day/Year)

6. Individual or Joint/Group Reporting
(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 at end of Issuer's Fiscal Year (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
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)	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class B Common Stock ⁽²⁾	09/22/2011	Â	S4	13,355	D	$ 11.1	8,303,710	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	09/23/2011	Â	S4	8,528	D	$ 11.83	8,295,182	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	09/23/2011	Â	S4	50,000	D	$ 11.89	8,245,182	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	09/26/2011	Â	S4	4,948	D	$ 11.79	8,240,234	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	09/26/2011	Â	S4	50,000	D	$ 11.55	8,190,234	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	09/27/2011	Â	S4	10,132	D	$ 11.98	8,180,102	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	09/27/2011	Â	S4	22,759	D	$ 11.55	8,157,343	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/05/2011	Â	S4	49,700	D	$ 10.86	8,107,643	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/05/2011	Â	S4	15,017	D	$ 10.89	8,092,626	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/06/2011	Â	S4	50,000	D	$ 10.91	8,042,626	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/06/2011	Â	S4	12,922	D	$ 10.86	8,029,704	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/07/2011	Â	S4	1,600	D	$ 10.91	8,028,104	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/10/2011	Â	S4	51,472	D	$ 10.98	7,976,632	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/12/2011	Â	S4	5,000	D	$ 11.22	7,971,632	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/12/2011	Â	S4	22,330	D	$ 11.49	7,949,302	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/13/2011	Â	S4	21,200	D	$ 11.84	7,928,102	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/14/2011	Â	S4	38,993	D	$ 12.23	7,889,109	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/17/2011	Â	S4	17,122	D	$ 12.39	7,871,987	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/21/2011	Â	S4	8,837	D	$ 11.85	7,863,150	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/24/2011	Â	S4	26,200	D	$ 11.99	7,836,950	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/25/2011	Â	S4	200,000	D	$ 12.71	7,636,950	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/26/2011	Â	S4	100,000	D	$ 12.85	7,536,950	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/26/2011	Â	S4	34,900	D	$ 13	7,502,050	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/26/2011	Â	S4	25,000	D	$ 13.03	7,477,050	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/27/2011	Â	S4	42,300	D	$ 14.28	7,434,750	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/27/2011	Â	S4	160,000	D	$ 13.85	7,274,750	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/28/2011	Â	S4	4,100	D	$ 14.06	7,270,650	D ⁽¹⁾	Â
Class B Common Stock ⁽²⁾	10/31/2011	Â	S4	2,584	D	$ 13.81	7,268,066	D ⁽¹⁾	Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

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SEC 2270 (9-02)

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 at End of Issuer's Fiscal Year
(Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)

11. Nature of Indirect Beneficial Ownership
(Instr. 4)

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Ridgeback Capital Investments L.P. 430 PARK AVENUE 12TH FLOOR NEW YORK,Â NYÂ 10022	Â	Â X	Â	Â
Ridgeback Capital Investments Ltd. 430 PARK AVENUE 12TH FLOOR NEW YOR,,Â NYÂ 10022	Â	Â X	Â	Â
Ridgeback Capital Management LP 430 PARK AVENUE 12TH FLOOR NEW YORK,Â NYÂ 10022	Â	Â X	Â	Â

Signatures

/s/ Bud Holman, Attorney-in-Fact		01/31/2012
^**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)	Ridgeback Capital Investments L.P. owns all of the securities reported herein directly. Ridgeback Capital Investments Ltd. is the general partner of Ridgeback Capital Investments L.P. Pursuant to an investment management agreement, Ridgeback Capital Management LP maintains investment and voting power with respect to the securities held or controlled by Ridgeback Capital Investments Ltd. Wayne Holman, an individual, controls Ridgeback Capital Management LP. Ridgeback Capital Management LP, Ridgeback Capital Investments Ltd. and Wayne Holman do not own any securities reported herein directly and disclaim beneficial ownership of any of the securities covered by this statement, except to the extent of any pecuniary interest therein.
(2)	Shares of Class B Common Stock are convertible at any time, at the holder's election, and automatically upon transfer, on a one-for-one basis into shares of Class A Common Stock.
Â Remarks: DisgorgementÂ ofÂ profitsÂ isÂ beingÂ madeÂ byÂ theÂ ReportingÂ PersonsÂ toÂ theÂ Issuer. ThisÂ isÂ 1Â ofÂ 3Â FormÂ 5sÂ beingÂ filed.

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