Sec Form 4 Filing - Koppel Adam @ Dicerna Pharmaceuticals Inc - 2021-06-03

FORM 4 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 Koppel Adam 2. Issuer Name and Ticker or Trading Symbol Dicerna Pharmaceuticals Inc [ DRNA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC, 200 CLARENDON STREET 3. Date of Earliest Transaction (MM/DD/YY) 06/03/2021 (Street) BOSTON, MA02116 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 06/03/2021 M 3,333 A $ 0 3,333 D Common Stock 3,080,237 I See footnotes ( 3 ) ( 4 )

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 Transaction(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 Restricted Stock Units ( 1 ) 06/03/2021 M 3,333 ( 1 ) ( 1 ) Common Stock 3,333 $ 0 0 D Restricted Stock Units ( 1 ) 06/03/2021 A 3,333 ( 1 ) ( 1 ) Common Stock 3,333 $ 0 3,333 D Director Stock Option (Right to Buy) $ 30.47 06/03/2021 A 15,000 ( 2 ) 06/02/2031 Common Stock 15,000 $ 0 15,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Koppel Adam C/O BAIN CAPITAL LIFE SCIENCES INVESTORS LLC, 200 CLARENDON STREET BOSTON, MA02116 X Signatures /s/ Adam Koppel 06/07/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents restricted stock units ("RSUs") that vest in full on the earlier of (i) 12 months from the date of grant and (ii) the Issuer's next regularly scheduled annual meeting of stockholders that occurs following the date of grant, subject to the Reporting Person's continued service to the Issuer as a director through such vesting date. Each RSU represents the contingent right to receive one share of the Issuer's Common Stock. The RSUs do not expire. ( 2 )This option vests in equal monthly installments over 12 months from the date of grant , provided that the option will vest in full on the Issuer's next regularly scheduled annual meeting of stockholders that occurs following the date of grant, subject to the Reporting Person's continued service to the Issuer as a director through each applicable vesting date. ( 3 )Represents shares of common stock held directly by Bain Capital Life Sciences Fund, L.P. ("BCLS") and BCIP Life Sciences Associates, LP ("BCIPLS" and, together with BCLS, the "Bain Capital Life Sciences Entities"). ( 4 )Bain Capital Life Sciences Investors, LLC ("BCLSI") is the ultimate general partner of BCLS and governs the investment strategy and decision-making process with respect to investments held by BCIPLS. Dr. Koppel is a Managing Director of BCLSI. By virtue of the relationships described in this footnote, Dr. Koppel may be deemed to share voting and dispositive power with respect to the shares of common stock held by the Bain Capital Life Sciences Entities. Dr. Koppel disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

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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