<SEC-DOCUMENT>0001193125-21-044749-index.html : 20210216
<SEC-HEADER>0001193125-21-044749.hdr.sgml : 20210216
<ACCEPTANCE-DATETIME>20210216154250
ACCESSION NUMBER:		0001193125-21-044749
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20210216
DATE AS OF CHANGE:		20210216
GROUP MEMBERS:		JOSEPH EDELMAN
GROUP MEMBERS:		PERCEPTIVE LIFE SCIENCES MASTER FUND, LTD.

SUBJECT COMPANY:	

	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:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90188
		FILM NUMBER:		21637387

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PERCEPTIVE ADVISORS LLC
		CENTRAL INDEX KEY:			0001224962
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		51 ASTOR PLACE, 10TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10003
		BUSINESS PHONE:		646-205-5300

	MAIL ADDRESS:	
		STREET 1:		51 ASTOR PLACE, 10TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10003
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>d131284dsc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>
Document 1 - file: d131284dsc13ga.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1
<SEQUENCE>2
<FILENAME>d131284dex1.htm
<DESCRIPTION>EX-1
<TEXT>
Document 2 - file: d131284dex1.htm

</DOCUMENT>
</SEC-DOCUMENT>