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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1374690	Zafgen Inc.	ZFGN	Pharmaceutical Preparations (2834)	203857670

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1611048	E. Thomas Hughes	C/O Zafgen, Inc., 175 Portland Street, 4Th Floor Boston MA 02114	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2015-09-17	4,874	$2.45	23,320	No	4	M	Direct
Common Stock	Disposition	2015-09-17	22,500	$40.00	820	No	4	S	Direct
Common Stock	Acquisiton	2015-09-18	23,126	$2.45	23,946	No	4	M	Direct
Common Stock	Disposition	2015-09-18	23,126	$45.00	820	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2015-09-17	4,874	$0.00	4,874	$2.45
Common Stock	Stock Option (Right to Buy)	Disposition	2015-09-18	23,126	$0.00	23,126	$2.45

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
183,681		2023-06-12	No	4	M	Direct
160,555		2023-06-12	No	4	M	Direct

Footnotes

Includes 428 shares acquired by the Reporting Person under Zafgen, Inc.'s 2014 Employee Stock Purchase Plan (the "Plan") on June 30, 2015 and 392 shares acquired under the Plan on December 31, 2014.
This sale of shares by the Reporting Person was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.
25% of this option vested on December 19, 2013, and the remainder vests in equal monthly installments thereafter over 36 months.