SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
RA CAPITAL MANAGEMENT, LLC

(Last) (First) (Middle)
C/O RA CAPITAL MANAGEMENT, LLC
20 PARK PLAZA, SUITE 1200

(Street)
BOSTON MA 02116

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
ACHILLION PHARMACEUTICALS INC [ ACHN ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
08/28/2014
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, $0.001 par value 08/28/2014 S 173,641 (1) D $11.5144 15,366,014 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 4,150 (1) D $11.5255 15,361,864 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 2,635 (1) D $11.4211 15,359,229 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 33,960 (1) D $11.409 15,325,269 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 30,500 (1) D $11.436 15,294,769 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 46,600 (1) D $11.445 15,248,169 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 217,000 (1) D $11.4 15,031,169 I See Footnotes (3) (4)
Common Stock, $0.001 par value 08/29/2014 S 64,000 (1) D $11.4134 14,967,169 I See Footnotes (3) (4)
Common Stock, $0.001 par value 09/02/2014 S 1,100 (1) D $11.9318 14,966,069 I See Footnotes (3) (4)
Common Stock, $0.001 par value 09/02/2014 S 103,052 (1) D $12.0064 14,863,017 I See Footnotes (3) (4)
Common Stock, $0.001 par value 09/02/2014 S 158,655 (1) D $12.0382 14,704,362 (2) I See Footnotes (3) (4)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
1. Name and Address of Reporting Person*
RA CAPITAL MANAGEMENT, LLC

(Last) (First) (Middle)
C/O RA CAPITAL MANAGEMENT, LLC
20 PARK PLAZA, SUITE 1200

(Street)
BOSTON MA 02116

(City) (State) (Zip)
1. Name and Address of Reporting Person*
RA Capital Healthcare Fund LP

(Last) (First) (Middle)
C/O RA CAPITAL MANAGEMENT, LLC
20 PARK PLAZA, SUITE 1200

(Street)
BOSTON MA 02116

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Kolchinsky Peter

(Last) (First) (Middle)
C/O RA CAPITAL MANAGEMENT, LLC
20 PARK PLAZA, SUITE 1200

(Street)
BOSTON MA 02116

(City) (State) (Zip)
Explanation of Responses:
1. All such shares were sold by RA Capital Healthcare Fund, L.P. (the "Fund").
2. Following the transactions set forth on Table I above, 11,390,517 shares are held by the Fund, and 3,313,845 shares are held in an account owned by Blackwell Partners, LLC (the "Blackwell Account").
3. 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.
4. 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.
Peter Kolchinsky, Manager of RA Capital Management, LLC 09/02/2014
Peter Kolchinsky, individually 09/02/2014
Peter Kolchinsky, Manager of RA Capital Management, LLC, the General Partner of RA Capital Healthcare Fund, L.P. 09/02/2014
** Signature of Reporting Person Date
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* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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