<SEC-DOCUMENT>0001104659-17-003614-index.html : 20170123
<SEC-HEADER>0001104659-17-003614.hdr.sgml : 20170123
<ACCEPTANCE-DATETIME>20170123181504
ACCESSION NUMBER:		0001104659-17-003614
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170123
FILED AS OF DATE:		20170123
DATE AS OF CHANGE:		20170123

ISSUER:		

	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

	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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Dietz Thomas John
		CENTRAL INDEX KEY:			0001574218

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		17542153

	MAIL ADDRESS:	
		STREET 1:		C/O TRANSCEPT PHARMACEUTICAL, INC.
		STREET 2:		1003 W. CUTTING BLVD, STE 110
		CITY:			PT. RICHMOND
		STATE:			CA
		ZIP:			94804
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
Document 1 - file: a4.html

Document 1 - RAW XML: a4.xml

</DOCUMENT>
</SEC-DOCUMENT>