<SEC-DOCUMENT>0001104659-18-074499-index.html : 20181221
<SEC-HEADER>0001104659-18-074499.hdr.sgml : 20181221
<ACCEPTANCE-DATETIME>20181221170618
ACCESSION NUMBER:		0001104659-18-074499
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20181221
DATE AS OF CHANGE:		20181221

SUBJECT COMPANY:	

	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:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-88731
		FILM NUMBER:		181250399

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Westphal Christoph H
		CENTRAL INDEX KEY:			0001291961

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	MAIL ADDRESS:	
		STREET 1:		C/O ALNYLAM PHARMACEUTICALS, INC
		STREET 2:		300 THIRD STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>a18-41983_1sc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
Document 1 - file: a18-41983_1sc13da.htm

</DOCUMENT>
</SEC-DOCUMENT>