X0306 4 2020-01-08 0 0001399529 Dicerna Pharmaceuticals Inc DRNA 0001266625 ROSSKAMP RALF C/O DICERNA PHARMACEUTICALS, INC. 33 HAYDEN AVENUE LEXINGTON MA 02421 0 1 0 0 Chief Medical Officer Restricted Stock Units 2020-01-08 4 A 0 23100 0.00 A Common Stock 23100 23100 D Employee Stock Option (Right to Buy) 22.58 2020-01-08 4 A 0 85000 0.00 A 2030-01-07 Common Stock 85000 85000 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 January 8, 2020, subject in each case to the reporting person's continued service with the issuer through each applicable vesting date. Each RSU represents the contingent right to receive one share of the Issuer's Common Stock. The option vests in 48 substantially equal monthly installments, with the first installment vesting on the last day of January 2020, and the remaining shares vesting on the last day of each of the 47 months thereafter; subject in each case to the reporting person's continued service with the issuer through each applicable vesting date. /s/ John B. Green, attorney-in-fact 2020-01-10