13D Filing: RA Capital Management and Dicerna Pharmaceuticals Inc (DRNA)

Page 2 of 6 – SEC Filing

CUSIP No. 253031108

1

Names of Reporting Persons.

RA Capital Management, LLC

2 Check the Appropriate Box if a Member of a Group (See Instructions)
(a) ¨
(b) ¨
3 SEC Use Only
4

Source of Funds (See Instructions):

AF

5

Check if disclosure of legal proceedings
is required pursuant to Items 2(d) or 2(e):

¨

6 Citizenship or Place of Organization.     Massachusetts

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

7     Sole Voting Power     0
8     Shared Voting Power      5,074,013
9     Sole Dispositive Power     0
10   Shared Dispositive Power  5,074,013
11

Aggregate Amount Beneficially Owned by
Each Reporting Person

5,074,013

12 Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)     ¨
13

Percent of Class Represented by Amount
in Row (11)

9.9%1

14

Type of Reporting Person (See Instructions)

IA, OO (Limited Liability Company)

       

1 Represents 5,074,013 shares of the common stock (“Common Stock”) of Dicerna Pharmaceuticals, Inc.
(the “Issuer”) which constitutes approximately 9.86% of the class outstanding. The percentage calculation assumes
that there are currently 51,471,160 outstanding shares of the Common Stock of the Issuer, as advised by the Issuer.

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