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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1481512	Ra Pharmaceuticals Inc.	RARX	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1315082	Ra Capital Healthcare Fund Lp	C/O Ra Capital Management, Llc 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	Yes	No	Yes	No
1384859	Peter Kolchinsky	C/O Ra Capital Management, Llc 20 Park Plaza, Suite 1200 Boston MA 02116	No	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	Acquisiton	2018-02-14	2,500,000	$6.00	3,851,808	No	4	P	Indirect	See Note

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

Footnotes

These securities include 2,023,134 shares held by RA Capital Healthcare Fund, L.P. (the "Fund") and 476,866 shares held in an account owned by a separately managed account (the "Account").
Represents 3,135,084 shares of Common Stock held by the Fund and 716,724 shares of Common Stock held in the Account.
RA Capital Management, LLC (the "Adviser") is the general partner of the Fund and the investment adviser of the Account. Peter Kolchinsky is the sole manager of the Adviser. The Adviser and Mr. Kolchinsky disclaim beneficial ownership of the reported securities in reliance on Rule 16a-1(a)(1)(v) and (vii) and disclaim any obligation to file reports under Section 16 other than as directors by deputization. The Adviser and Mr. Kolchinsky have no pecuniary interest in the reported securities held in the Account and disclaim: (A) beneficial ownership thereof for purposes of Rule 16a-1(a)(2) and (B) beneficial ownership of securities held by the Fund, for purposes of Rule 16a-1(a)(2), except to the extent of their pecuniary interest therein.