<SEC-DOCUMENT>0001047469-19-000333-index.html : 20190201
<SEC-HEADER>0001047469-19-000333.hdr.sgml : 20190201
<ACCEPTANCE-DATETIME>20190201172729
ACCESSION NUMBER:		0001047469-19-000333
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20190201
DATE AS OF CHANGE:		20190201

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LEAP THERAPEUTICS, INC.
		CENTRAL INDEX KEY:			0001509745
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				274412575
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-223419
		FILM NUMBER:		19560895

	BUSINESS ADDRESS:	
		STREET 1:		47 THORNDIKE STREET
		STREET 2:		SUITE B1-1
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		617 252 4343

	MAIL ADDRESS:	
		STREET 1:		47 THORNDIKE STREET
		STREET 2:		SUITE B1-1
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Dekkun Corp
		DATE OF NAME CHANGE:	20110107
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>a2237643z424b5.htm
<DESCRIPTION>424B5
<TEXT>
Document 1 - file: a2237643z424b5.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g412032.jpg
<DESCRIPTION>G412032.JPG
<TEXT>
Document 2 - file: g412032.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g690344.jpg
<DESCRIPTION>G690344.JPG
<TEXT>
Document 3 - file: g690344.jpg

</DOCUMENT>
</SEC-DOCUMENT>