Sec Form 4/A Filing - Pillar Invest Corp @ IDERA PHARMACEUTICALS, INC. - 2021-04-01

FORM 4/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP 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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1. Name and Address of Reporting Person Pillar Invest Corp 2. Issuer Name and Ticker or Trading Symbol IDERA PHARMACEUTICALS, INC. [ IDRA] 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) C/O STUARTS CORPORATE SERVICES LTD., KENSINGTON HOUSE, 69 DR. ROY'S DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 04/01/2021 (Street) GEORGETOWN, GRAND CAYMAN, E9KY1-1104 4. If Amendment, Date Original Filed (MM/DD/YY) 03/31/2021 6. Individual or Joint/Group Filing (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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 04/01/2021 X 1,612,196 A $ 0.01 5,733,795 I By Pillar Partners Foundation, L.P.See Footnotes ( 1 ) ( 3 ) Common Stock 04/01/2021 X 883,613 A $ 0.01 2,304,180 I By Pillar Pharmaceuticals 6, L.P.See Footnotes ( 1 ) ( 2 ) Common Stock 386,110 I By Abude UmariSee Footnotes ( 1 ) Common Stock 26,308 I By Youssef El ZeinSee Footnotes ( 1 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Following Reported Transactio n(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Prefunded Warrants $ 0.01 04/01/2021 X 1,612,196 12/11/2020 ( 3 ) Common Stock 1,612,196 $ 0.01 1,612,196 I By Pillar Partners Foundation, L.P.See Footnote ( 2 ) Prefunded Warrants $ 0.01 04/01/2021 X 883,613 12/11/2020 ( 3 ) Common Stock 883,613 $ 0.01 883,613 I By Pillar Pharmaceuticals 6, L.P.See Footnote ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Pillar Invest Corp C/O STUARTS CORPORATE SERVICES LTD. KENSINGTON HOUSE, 69 DR. ROY'S DRIVE GEORGETOWN, GRAND CAYMAN, E9KY1-1104 X Pillar Partners Foundation, L.P. C/O STUARTS CORPORATE SERVICES LTD. KENSINGTON HOUSE, 69 DR. ROY'S DRIVE GEORGETOWN, GRAND CAYMAN, E9KY1-1104 X Pillar Pharmaceuticals 6, L.P. C/O STUARTS CORPORATE SERVICES LTD. KENSINGTON HOUSE, 69 DR. ROY'S DRIVE GEORGETOWN, GRAND CAYMAN, E9KY1-1104 X Umari Abude C/O STUARTS CORPORATE SERVICES LTD. KENSINGTON HOUSE, 69 DR. ROY'S DRIVE GEORGETOWN, GRAND CAYMAN, E9KY1-1104 X ZEIN YOUSSEF EL C/O STUARTS CORPORATE SERVICES LTD. KENSINGTON HOUSE, 69 DR. ROY'S DRIVE GEORGETOWN, GRAND CAYMAN, E9KY1-1104 X Signatures Pillar Invest Corporation, /s/ Youssef El Zein, Authorized Person 04/29/2021 Signature of Reporting Person Date Pillar Partners Foundation, L.P., /s/ Youssef El Zein, Authorized Person 04/29/2021 Signature of Reporting Person Date Pillar Pharmaceuticals, 6, L.P., /s/ Youssef El Zein, Authorized Person 04/29/2021 Signature of Reporting Person Date /s/ Abude Umari 04/29/2021 Signature of Reporting Person Date /s/ Youssef El Zein 04/29/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pillar Invest Corporation ("Pillar GP") is the general partner of Pillar Pharmaceuticals 6, L.P. ("Pillar 6") and Pillar Partners Foundation, L.P. (collectively, the "Pillar Funds"). Youssef El Zein and Abude Umari are directors of Pillar GP. Each of Pillar GP, Mr. El Zein and Mr. Umari disclaims Section 16 beneficial ownership of the securities beneficially owned by the Pillar Funds and this report shall not be deemed an admission that any of Pillar GP, Mr. El Zein or Mr. Umari is the Section 16 beneficial owner of any such securities, except to the extent of its or his pecuniary interest therein, if any, by virtue of its or his ownership interest in the Pillar Funds or Pillar GP, as applicable. ( 2 )1,612,196 of such warrants beneficially owned and exercised for shares of common stock by Pillar Partners, of which Pillar GP is the general partner (the "Pillar Partners Warrants") and 883,613 of such warrants exercised by Pillar 6 (the "Pillar 6 Warrants"). Pillar GP disclaims Section 16 beneficial ownership of the Pillar Partners Warrants and the Pillar 6 Warrants and the common stock underlying such warrants and this report shall not be deemed an admission that Pillar GP is the Section 16 beneficial owner of any such securities, except to the extent of its pecuniary interest therein, if any, by virtue of its ownership interest in Pillar Partners Warrants or Pillar 6 Warrants. ( 3 )The Pre-funded warrants have no expiration date.

Remarks: The Reporting Persons realized short-swing profits under Section 16(b) of the Exchange Act as a result of sales of the Issuer's common stock reported herein being matched against previous acquisitions of prefunded warrants made by certain of the Reporting Persons on December 11, 2020. On April 28, 2021, the Reporting Persons disgorged $11,592.80 to the Issuer, representing the maximum amount of short-swing profits that may have been realized by the Reporting Persons and made a payment to the Issuer of such amount.

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

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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