<SEC-DOCUMENT>0001047469-17-007741-index.html : 20171219
<SEC-HEADER>0001047469-17-007741.hdr.sgml : 20171219
<ACCEPTANCE-DATETIME>20171219100923
ACCESSION NUMBER:		0001047469-17-007741
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20180112
FILED AS OF DATE:		20171219
DATE AS OF CHANGE:		20171219
EFFECTIVENESS DATE:		20171219

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:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		171263038

	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>
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<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>a2234092zdef14a.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: a2234092zdef14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g530771.jpg
<DESCRIPTION>G530771.JPG
<TEXT>
Document 2 - file: g530771.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g281842bgi001.gif
<DESCRIPTION>G281842BGI001.GIF
<TEXT>
Document 3 - file: g281842bgi001.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g281842bgi002.gif
<DESCRIPTION>G281842BGI002.GIF
<TEXT>
Document 4 - file: g281842bgi002.gif

</DOCUMENT>
</SEC-DOCUMENT>