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

Page 4 of 6 – SEC Filing

CUSIP No. 253031108

1

Names of Reporting Persons.

RA Capital Healthcare Fund, L.P.

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):

WC

5

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

¨

6 Citizenship or Place of Organization.     Delaware

Number

of Shares

Beneficially

Owned by

Each

Reporting

Person With

7     Sole Voting Power     0
8     Shared Voting Power      4,414,752
9     Sole Dispositive Power     0
10   Shared Dispositive Power  4,414,752
11

Aggregate Amount Beneficially Owned by
Each Reporting Person

4,414,752

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

Percent of Class Represented by Amount
in Row (11)

8.6%3

14

Type of Reporting Person (See Instructions)

PN (Limited Partnership)

       

3 Represents 4,414,752 shares of the Common
Stock of the Issuer which constitutes approximately 8.58% 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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