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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1446847	Ironwood Pharmaceuticals Inc	IRWD	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1361754	J Alexander Denner	C/O Ironwood Pharmaceuticals, Inc. 100 Summer Street, Suite 2300 Boston MA 02110		Yes	No	Yes	No
1577524	Sarissa Capital Management Lp	660 Steamboat Road, 3Rd Floor Greenwich CT 06830		Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Acquisiton	2021-03-08	150,000	$10.30	16,315,000	No	4	P	Indirect	See Footnote
Class A Common Stock	Acquisiton	2021-03-10	75,000	$10.54	16,390,000	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class A Common Stock	37,844	Direct

Footnotes

Shares held directly by Dr. Denner.
Consists of shares that are held by Sarissa Capital Management LP ("Sarissa Capital") or by the funds and other investment vehicles (the "Sarissa Funds") for which Sarissa Capital serves as investment advisor. Dr. Denner is the Chief Investment Officer of Sarissa Capital and the managing member, general partner or other control party of the Sarissa Funds. By virtue of the foregoing, Dr. Denner may be deemed to indirectly beneficially own the shares that these funds directly beneficially own. Each of Sarissa Capital, the Sarissa Funds and Dr. Denner disclaims beneficial ownership of these shares except, in each case, to the extent of their pecuniary interest therein.