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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
861838	Idera Pharmaceuticals Inc.	IDRA	Biological Products, (No Disgnostic Substances) (2836)	043072298

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1443689	Senator Investment Group Lp	510 Madison Avenue 28Th Floor New York NY 10022		No	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
Common Stock	Disposition	2012-04-17	4,000	$2.15	2,996,000	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2012-04-17	74,000	$2.15	2,922,000	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2012-04-18	42,000	$2.09	2,880,000	No	4	S	Indirect	See Footnote

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

Footnotes

The entities and individuals identified in this Form 4 (the "Reporting Persons") disclaim any membership in any "group".
The amount of securities shown in this row is owned by Senator Global Opportunity Master Fund L.P. (the "Master Fund"). As Investment Manager to the Master Fund, Senator Investment Group LP ("Senator LP") may be deemed to be the beneficial owner of the Issuer's securities owned by the Master Fund, but disclaims beneficial ownership to the extent such ownership exceeds its pecuniary interest. Douglas Silverman, a United States citizen, and Alexander Klabin, a United States citizen, have control of a Delaware limited liability company that may be deemed to control Senator LP. Each of Messrs. Silverman and Klabin disclaim beneficial ownership of the shares held by the Master Fund to the extent such beneficial interest exceeds his pecuniary interest.