Salarius Pharmaceuticals, Inc. — Director's Dealing 2017

May 30, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Flex Pharma, Inc. (FLKS)
CIK: 0001615219
Period of Report: 2017-05-26

Reporting Person: McVicar William K. (President, R&D)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-26	Stock Option (right to buy)	$3.37	A	200000	Acquired	2027-05-26	Common Stock (200000.0)	Direct

Footnotes

F1: 25% of the total shares underlying this option vest on April 5, 2018 and the remaining shares vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date.