-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, N8Dyfci94nXE7VuJuoxBIBXZ38vjTtnyRCECTyKYsPXmPeFgyGR2pOswlJ9VfiK6 KRYrlfDnCy1M9JwR3Zcq/g== 0001137774-10-000048.txt : 20100310 0001137774-10-000048.hdr.sgml : 20100310 20100310114044 ACCESSION NUMBER: 0001137774-10-000048 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20100310 DATE AS OF CHANGE: 20100310 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: IRONWOOD PHARMACEUTICALS INC CENTRAL INDEX KEY: 0001446847 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FILING VALUES: FORM TYPE: SC 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-85292 FILM NUMBER: 10669456 BUSINESS ADDRESS: STREET 1: 320 BENT STREET CITY: CAMBRIDGE STATE: MA ZIP: 02141 BUSINESS PHONE: 617-621-7722 MAIL ADDRESS: STREET 1: 320 BENT STREET CITY: CAMBRIDGE STATE: MA ZIP: 02141 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: PRUDENTIAL FINANCIAL INC CENTRAL INDEX KEY: 0001137774 STANDARD INDUSTRIAL CLASSIFICATION: LIFE INSURANCE [6311] IRS NUMBER: 223703799 STATE OF INCORPORATION: NJ FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 751 BROAD ST CITY: NEWARK STATE: NJ ZIP: 07102 BUSINESS PHONE: 9738026000 MAIL ADDRESS: STREET 1: 751 BROAD ST CITY: NEWARK STATE: NJ ZIP: 07102 SC 13G 1 iron.htm 13G HTML File DOCUMENT TYPE SC 13G
TEXT


SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934


Name of Issuer: IRONWOOD PHARMACEUTICALS INC
_____________________________________________________
Title of Class
of Securities: Common Stock

CUSIP Number: 46333X108

1) NAME AND I.R.S. IDENTIFICATION NO. OF REPORTING PERSON

Prudential Financial, Inc. 22-3703799

2.) MEMBER OF A GROUP: (a) N/A
(b) N/A

3) SEC USE ONLY:



4) PLACE OF ORGANIZATION: New Jersey

NUMBER OF SHARES BENEFICIALLY OWNED BY REPORTING PERSON WITH:

5) Sole Voting Power: 0 See Exhibit A
6) Shared Voting Power: 0 See Exhibit A
7) Sole Dispositive Power: 0 See Exhibit A
8) Shared Dispositive Power: 2,324,000 See Exhibit A

9) AGGREGATE AMOUNT BENEFICIALLY OWNED:
2,324,000 See Exhibit A

10) AGGREGATE AMOUNT IN ROW (9) EXCLUDES SHARES: Not Applicable

11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
12.1 See Exhibit A

12) TYPE OF REPORTING PERSON: HC

ITEM 1(a). NAME OF ISSUER:

IRONWOOD PHARMACEUTICALS INC

ITEM 1(b). ADDRESS OF ISSUER'S EXECUTIVE OFFICES:

IRONWOOD PHARMACEUTICALS INC 320 Bent Street Cambridge, MA 02141

ITEM 2(a). NAME OF PERSON FILING:

Prudential Financial, Inc.

ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE:

751 Broad Street
Newark, New Jersey 07102-3777

ITEM 2(c). CITIZENSHIP:

New Jersey

ITEM 2(d). TITLE OF CLASS OF SECURITIES:

Common Stock

ITEM 2(e). CUSIP NUMBER:

46333X108

ITEM 3. The Person filing this statement is a Parent Holding Company as
defined in Section 240.13d-1(b)(1)(ii)(G) of the Securities Exchange
Act of 1934.

ITEM 4. OWNERSHIP:

(a) Number of Shares
Beneficially Owned: 2,324,000 See Exhibit A

(b) Percent of Class: 12.1


(c) Powers                No. Of Shares

   -----------           -------------------- 

Sole power to vote or    0  See Exhibit A
to direct the vote

Shared power to vote or   0  See Exhibit A
to direct the vote

Sole power to dispose or  0 See Exhibit A
to direct disposition

Shared power to dispose   2,324,000  See Exhibit A
or to direct disposition

ITEM 5. OWNERSHIP OF 5% OR LESS OF A CLASS:

Not Applicable

ITEM 6. OWNERSHIP OF MORE THAN 5% ON BEHALF OF
ANOTHER PERSON:

See Exhibit A

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE
SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING
REPORTED ON BY THE ULTIMATE PARENT COMPANY:

See Exhibit A

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF
MEMBERS OF THE GROUP:

Not Applicable

ITEM 9. NOTICE OF DISSOLUTION OF GROUP:

Not Applicable

ITEM 10. CERTIFICATION:

By signing below, Prudential Financial, Inc. certifies that, to the best of its
knowledge and belief, the securities referred to above were acquired
and are held in the ordinary course of business and 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.


The filing of this statement should not be construed as an admission that
Prudential Financial, Inc. is, for purposes of Sections 13 or 16 of the Securities
Exchange Act of 1934, the beneficial owner of such shares.


SIGNATURE

After reasonable inquiry and to the best of its knowledge and belief,
Prudential Financial, Inc. certifies that the information set forth in this
statement is true, complete and correct.

PRUDENTIAL FINANCIAL, INC.

By: Richard Baker
Second Vice President

Date: 03/10/2010
As of: 02/28/2010

Exhibit A
--------------

ITEM 6. OWNERSHIP:

Prudential Financial, Inc. may be deemed the beneficial owner of securities
beneficially owned by the Item 7 listed entities and may have direct or
indirect voting and/or investment discretion over 2,324,000 shares which are
held for it's own benefit or for the benefit of its clients by its separate
accounts, externally managed accounts, registered investment companies,
subsidiaries and/or other affiliates.  Prudential Financial, Inc.  is reporting
the combined holdings of these entities for the purpose of administrative
convenience.

These shares were acquired in the ordinary course of business, and not with the
purpose or effect of changing or influencing control of the Issuer.  The filing
of this statement should not be construed as an admission that Prudential
Financial, Inc. is, for the purposes of Sections 13 or 16 of the Securities
Exchange Act of 1934, the beneficial owner of these shares.


ITEM 7. IDENTIFICATION/CLASSIFICATION:

Prudential Financial, Inc. is a Parent Holding Company and the direct or indirect parent of the following Registered Investment Advisers and Broker Dealers:








 The Prudential Insurance Company of America


 IC,IA


  Prudential Investment Management, Inc.


 IA


 Jennison Associates LLC


 IA


  Prudential Bache Asset Management, Inc.


 IA


 Prudential Investments LLC 


 IA


  Prudential Private Placement Investors, L.P.


 IA,PN


 Pruco Securities, LLC


 IA,BD


  Prudential Investment Management Services LLC


 BD


 AST Investment Services, Inc.


 IA


  Prudential Annuities Distributors, Inc.


 BD


 Quantitative Management Associates LLC


 IA


  Prudential International Investments Advisers, LLC


 IA


 Global Portfolio Strategies, Inc.


 IA


  Prudential Bache Securities, LLC


 BD


 Prudential Bache Commodities, LLC


 BD

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