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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1070336	Achillion Pharmaceuticals Inc	ACHN	Pharmaceutical Preparations (2834)	000000000

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	No	Yes
1346824	Ra Capital Management, Llc	C/O Ra Capital Management, Llc 20 Park Plaza, Suite 1200 Boston MA 02116	No	No	No	Yes
1384859	Peter Kolchinsky	C/O Ra Capital Management, Llc 20 Park Plaza, Suite 1200 Boston MA 02116	No	No	No	Yes

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, $0.001 Par Value	Disposition	2014-09-29	221,014	$10.96	7,811,000	No	4	S	Indirect	See Footnotes
Common Stock, $0.001 Par Value	Disposition	2014-09-30	411,000	$10.11	7,400,000	No	4	S	Indirect	See Footnotes
Common Stock, $0.001 Par Value	Disposition	2014-09-30	700,000	$10.02	6,700,000	No	4	S	Indirect	See Footnotes

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

Footnotes

The securities sold include 181,232 shares for by RA Capital Healthcare Fund, L.P. (the "Fund") and 39,782 shares for an account owned by Blackwell Partners, LLC (the "Blackwell Account").
The securities sold include 337,020 shares for the Fund and 73,980 shares for an account owned by the Blackwell Account.
The securities sold include 574,000 shares for the Fund and 126,000 shares for an account owned by the Blackwell Account.
Following the transactions set forth on Table I above 4,816,562 shares are held by the Fund, and 1,883,438 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.
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.