X0306 4 2020-09-01 0 0001399529 Dicerna Pharmaceuticals Inc DRNA 0001259856 FAMBROUGH DOUGLAS C/O DICERNA PHARMACEUTICALS, INC. 33 HAYDEN AVENUE LEXINGTON MA 02421 1 1 0 0 President and CEO Common Stock 2020-09-01 4 P 0 10000 18.0597 A 22300 D The price reported in Column 4 is a weighted-average price. These shares were purchased in multiple transactions at prices ranging from $17.88 to $18.20, inclusive. The Reporting Person undertakes to provide to Dicerna Pharmaceuticals, Inc., any security holder of Dicerna Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4. Exhibit 24 - Power of Attorney /s/ Douglas W. Pagan, attorney-in-fact 2020-09-01