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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1399529	Dicerna Pharmaceuticals Inc	DRNA	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1315082	Ra Capital Healthcare Fund Lp	20 Park Plaza, Suite 1200 Boston MA 02116	No	No	Yes	No
1346824	Ra Capital Management, Llc	20 Park Plaza, Suite 1200 Boston MA 02116	No	No	Yes	Yes
1384859	Peter Kolchinsky	20 Park Plaza, Suite 1200 Boston MA 02116	Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.0001 Per Share	Acquisiton	2014-02-04	1,428,571	$0.00	1,428,571	No	4	C	Indirect	See Footnotes
Common Stock, Par Value $0.0001 Per Share	Acquisiton	2014-02-04	1,000,000	$15.00	2,428,571	No	4	P	Indirect	See Footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnotes
No	4	P	Indirect	See Footnotes

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series C Preferred Stock, par value $0.0001	Disposition	2014-02-04	1,428,571	$0.00	1,428,571	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Direct

Footnotes

These shares include 1,428,571 of Common Stock that were converted from Series C Preferred Shares held by RA Capital Healthcare Fund, L.P. (the "Fund"). The Series C Preferred Shares converted into shares of the Issuer's Common Stock upon the closing of the Issuer's initial public offering of Common Stock.
The securities purchased include 827,500 shares for RA Capital Healthcare Fund, L.P. (the "Fund") and 172,500 shares for an account owned by Blackwell Partners, LLC (the "Blackwell Account").
Following the transactions set forth on Table I above, 2,256,071 shares are held by the Fund, and 172,500 shares are held in the Blackwell Account.
RA Capital Management, LLC (the "Adviser") is the general partner of the Fund and the investment adviser of the Blackwell Account. Peter Kolchinsky is the sole manager of the Adviser. In their respective capacities, each of Mr. Kolchinsky and the Adviser may be deemed to beneficially own the reported securities. In addition, Mr. Kolchinsky is a director of the Issuer.
Pursuant to Rule 16a-1 under the Securities Exchange Act of 1934, as amended (the "Act"), each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of their respective pecuniary interests therein. The filing of this Form 4 shall not be construed as an admission that Mr. Kolchinsky or the Adviser is or was for the purposes of Section 16(a) of the Act, or otherwise, the beneficial owner of any of securities reported herein.