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*
Flynn James E

(Last) (First) (Middle)
780 THIRD AVENUE, 37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
ZAFGEN, INC. [ ZFGN ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) X Other (specify below)
Possible Member of 10% Group
3. Date of Earliest Transaction (Month/Day/Year)
02/09/2016
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 02/09/2016 P 39,353 A $5.7291 (1) 365,698 I Through Deerfield Partners, L.P. (4) (5)
Common Stock 02/09/2016 P 50,086 A $5.7291 (1) 465,435 I Through Deerfield International Master Fund, L.P. (4) (5)
Common Stock 02/09/2016 P 24,484 A $5.7291 (1) 2,006,355 I Through Deerfield Special Situations Fund, L.P. (4) (5)
Common Stock 02/10/2016 P 52,239 A $6.2323 (2) 417,937 I Through Deerfield Partners, L.P. (4) (5)
Common Stock 02/10/2016 P 66,486 A $6.2323 (2) 531,921 I Through Deerfield International Master Fund, L.P. (4) (5)
Common Stock 02/10/2016 P 32,501 A $6.2323 (2) 2,038,856 I Through Deerfield Special Situations Fund, L.P. (4) (5)
Common Stock 02/11/2016 P 810 A $6.1884 (3) 418,747 I Through Deerfield Partners, L.P. (4) (5)
Common Stock 02/11/2016 P 1,030 A $6.1884 (3) 532,951 I Through Deerfield International Master Fund, L.P. (4) (5)
Common Stock 02/11/2016 P 504 A $6.1884 (3) 2,039,360 I Through Deerfield Special Situations Fund, L.P. (4) (5)
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*
Flynn James E

(Last) (First) (Middle)
780 THIRD AVENUE, 37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Deerfield Mgmt L.P.

(Last) (First) (Middle)
780 THIRD AVENUE
37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
1. Name and Address of Reporting Person*
DEERFIELD MANAGEMENT CO

(Last) (First) (Middle)
780 THIRD AVENUE, 37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Deerfield Special Situations Fund, L.P.

(Last) (First) (Middle)
780 3RD AVENUE
37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
1. Name and Address of Reporting Person*
DEERFIELD PARTNERS, LP

(Last) (First) (Middle)
780 THIRD AVENUE
37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Deerfield International Master Fund, L.P.

(Last) (First) (Middle)
780 THIRD AVENUE, 37TH FLOOR

(Street)
NEW YORK NY 10017

(City) (State) (Zip)
Explanation of Responses:
1. The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $5.515 to $5.85, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnotes (1), (2) and (3) of this Form 4.
2. The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $6.08 to $6.25, inclusive.
3. The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $6.00 to $6.25, inclusive.
4. This Form 4 is being filed by the undersigned as well as the entities listed on the Joint Filer Information Statement attached as an exhibit hereto (the "Reporting Persons"). Deerfield Mgmt, L.P. is the general partner of Deerfield Special Situations Fund, L.P., Deerfield Partners, L.P. and Deerfield International Master Fund, L.P. (collectively, the "Funds"). Deerfield Management Company, L.P. is the investment manager of the Funds. James E. Flynn is the sole member of the general partner of each of Deerfield Mgmt, L.P. and Deerfield Management Company, L.P.
5. In accordance with Instruction 4 (b)(iv) to Form 4, the entire amount of the Issuer's securities held by the Funds is reported herein. For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its indirect pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.
Remarks:
Jonathan Isler, Attorney-in-Fact: Power of Attorney, which is hereby incorporated by reference to Exhibit 24 to a Form 3 with regard to Editas Medicine, Inc. filed with the Securities and Exchange Commission on February 2, 2016 by Deerfield Mgmt, L.P., Deerfield Mgmt III, L.P., Deerfield Management Company, L.P., Deerfield Special Situations Fund, L.P., Deerfield Partners, L.P., Deerfield Private Design Fund, L.P., Deerfield Private Design International, L.P., Deerfield PDI Financing, L.P., Deerfield PDI Financing II, L.P., Deerfield Private Design Fund II, L.P., Deerfield Private Design International II, L.P., Deerfield International Master Fund, L.P., Deerfield Healthcare Innovations Fund, L.P., Deerfield Mgmt HIF, L.P., Breaking Stick Holdings, LLC, Deerfield Private Design Fund III, L.P. and James E. Flynn.
/s/ Jonathan Isler 02/11/2016
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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