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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1615219	Flex Pharma Inc.	FLKS	()	DE

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1543245	Longwood Fund Ii, L.p.	C/O Flex Pharma, Inc. 800 Boylston Street Boston MA 02199		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	2016-03-11	89,680	$7.00	2,786,944	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct

Footnotes

On March 11, 2016, Longwood Fund III, L.P. ("Longwood Fund III") purchased 89,680 shares of Common Stock of the Issuer (the "Common Shares")
Longwood Fund III owns 89,680 Common Shares and Longwood Fund II, L.P. ("Longwood Fund II") owns 2,697,264 Common Shares.
Longwood Fund II GP, LLC is the ultimate General Partner of Longwood Fund II and Longwood Fund III GP, LLC is the ultimate General Partner of Longwood Fund III. Christoph Westphal, M.D., Ph.D., Richard Aldrich and Michelle Dipp, M.D., Ph.D. (collectively, the "Managers") are managers of Longwood Fund II GP, LLC and Longwood Fund III GP, LLC, and, as such, may be deemed to have shared voting and dispositive power with respect to the Issuer's securities held by Longwood Fund II and Longwood Fund III (the "Longwood Shares"). Each of the Managers disclaims beneficial ownership of the Longwood Shares, except to the extent of their respective pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of the shares for purposes of Section 16 or for any other purpose.