X0306 4 2021-06-03 0 0001399529 Dicerna Pharmaceuticals Inc DRNA 0001578965 Koppel Adam C/O BAIN CAPITAL LIFE SCIENCES INVESTORS LLC, 200 CLARENDON STREET BOSTON MA 02116 1 0 0 0 Common Stock 2021-06-03 4 M 0 3333 0.00 A 3333 D Common Stock 3080237 I See footnotes Restricted Stock Units 2021-06-03 4 M 0 3333 0.00 D Common Stock 3333 0 D Restricted Stock Units 2021-06-03 4 A 0 3333 0.00 A Common Stock 3333 3333 D Director Stock Option (Right to Buy) 30.47 2021-06-03 4 A 0 15000 0.00 A 2031-06-02 Common Stock 15000 15000 D 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. 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. 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"). 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. /s/ Adam Koppel 2021-06-07