X0306 4 2020-06-19 0 0001399529 Dicerna Pharmaceuticals Inc DRNA 0001598479 Brown Bob D C/O DICERNA PHARMACEUTICALS, INC. 33 HAYDEN AVENUE LEXINGTON MA 02421 0 1 0 0 See Remarks Common Stock 2020-06-19 4 M 0 9670 2.97 A 14670 D Common Stock 2020-06-19 4 S 0 9670 25.00 D 5000 D Employee Stock Option (Right to Buy) 2.97 2020-06-19 4 M 0 9670 0.00 D 2027-01-03 Common Stock 9670 21876 D The Reporting Person sold an aggregate of 9,670 shares of common stock on June 19, 2020 (the "Shares Sold") as reported in this Form 4. The Shares Sold represent 0.98% of 990,997 shares of common stock, which is the number of shares of common stock owned by the Reporting Person prior to the Shares Sold transaction reported in this Form 4, as well as shares issuable upon exercise or settlement of vested and unvested options and restricted stock units held by the Reporting Person as of the date of this report. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 27, 2019. The option vests in 48 monthly installments over the four-year period starting on the last day of January 2017, subject in each case to the Reporting Person's continued service with the Issuer through the applicable vesting date. Chief Scientific Officer, EVP of R&D Exhibit 24 - Power of Attorney /s/ Douglas W. Pagan, attorney-in-fact 2020-06-23