<SEC-DOCUMENT>0001615219-19-000015-index.html : 20190424
<SEC-HEADER>0001615219-19-000015.hdr.sgml : 20190424
<ACCEPTANCE-DATETIME>20190424161444
ACCESSION NUMBER:		0001615219-19-000015
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		10
FILED AS OF DATE:		20190424
DATE AS OF CHANGE:		20190424

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Flex Pharma, Inc.
		CENTRAL INDEX KEY:			0001615219
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				465087339
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-231010
		FILM NUMBER:		19763994

	BUSINESS ADDRESS:	
		STREET 1:		800 BOYLSTON STREET
		STREET 2:		24TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199
		BUSINESS PHONE:		617-874-1821

	MAIL ADDRESS:	
		STREET 1:		800 BOYLSTON STREET
		STREET 2:		24TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3
<SEQUENCE>1
<FILENAME>flks20190424s-3.htm
<DESCRIPTION>S-3
<TEXT>
Document 1 - file: flks20190424s-3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.4
<SEQUENCE>2
<FILENAME>flks20190424s-3ex44.htm
<DESCRIPTION>EXHIBIT 4.4
<TEXT>
Document 2 - file: flks20190424s-3ex44.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.6
<SEQUENCE>3
<FILENAME>flks20190424s-3ex46.htm
<DESCRIPTION>EXHIBIT 4.6
<TEXT>
Document 3 - file: flks20190424s-3ex46.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.7
<SEQUENCE>4
<FILENAME>flks20190424s-3ex47.htm
<DESCRIPTION>EXHIBIT 4.7
<TEXT>
Document 4 - file: flks20190424s-3ex47.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.8
<SEQUENCE>5
<FILENAME>flks20190424s-3ex48.htm
<DESCRIPTION>EXHIBIT 4.8
<TEXT>
Document 5 - file: flks20190424s-3ex48.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>6
<FILENAME>flks20190424s-3ex51.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
Document 6 - file: flks20190424s-3ex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>7
<FILENAME>flks20190424s-3ex231.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
Document 7 - file: flks20190424s-3ex231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>cooleya03.jpg
<TEXT>
Document 8 - file: cooleya03.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>flexpharma.jpg
<TEXT>
Document 9 - file: flexpharma.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>flexpharmaa01.jpg
<TEXT>
Document 10 - file: flexpharmaa01.jpg

</DOCUMENT>
</SEC-DOCUMENT>