X0306 4 2020-06-01 0 0001399529 Dicerna Pharmaceuticals Inc DRNA 0001628880 Pagan Douglas W. C/O DICERNA PHARMACEUTICALS, INC. 33 HAYDEN AVENUE LEXINGTON MA 02421 0 1 0 0 Chief Financial Officer Restricted Stock Units 2020-06-01 4 A 0 27300 0.00 A Common Stock 27300 27300 D Employee Stock Option (Right to Buy) 20.79 2020-06-01 4 A 0 95650 0.00 A 2030-05-31 Common Stock 95650 95650 D Represents restricted stock units ("RSUs") that vest over a period of four years, with 25% of the RSUs vesting on each of the first, second, third and fourth anniversaries of June 15, 2020, subject in each case to the Reporting Person's continued employment or service with the Issuer through the applicable vesting date. Each RSU represents the contingent right to receive one share of the Issuer's Common Stock. The options vest 25% on the first year anniversary of the vesting start date of May 26, 2020 and the remaining 75% vest in 36 substantially equal monthly installments thereafter, subject in each case to the Reporting Person's continued employment or service with the Issuer through the applicable vesting date. /s/ Douglas W. Pagan 2020-06-02