<SEC-DOCUMENT>0000899243-20-011022-index.html : 20200420
<SEC-HEADER>0000899243-20-011022.hdr.sgml : 20200420
<ACCEPTANCE-DATETIME>20200420183420
ACCESSION NUMBER:		0000899243-20-011022
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200309
FILED AS OF DATE:		20200420
DATE AS OF CHANGE:		20200420

REPORTING-OWNER:	

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

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		20803631

	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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PERCEPTIVE LIFE SCIENCES MASTER FUND LTD
		CENTRAL INDEX KEY:			0001249675
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		20803632

	BUSINESS ADDRESS:	
		STREET 1:		C/O PERCEPTIVE ADVISORS LLC
		STREET 2:		51 ASTOR PLACE, 10TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10003
		BUSINESS PHONE:		646-205-5340

	MAIL ADDRESS:	
		STREET 1:		C/O PERCEPTIVE ADVISORS LLC
		STREET 2:		51 ASTOR PLACE, 10TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10003

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			EDELMAN JOSEPH
		CENTRAL INDEX KEY:			0001164426

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		20803633

	MAIL ADDRESS:	
		STREET 1:		C/O PERCEPTIVE ADVISORS LLC
		STREET 2:		51 ASTOR PLACE, 10TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10003

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
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc3.xml
<DESCRIPTION>FORM 3 SUBMISSION
<TEXT>
Document 1 - file: doc3.html

Document 1 - RAW XML: doc3.xml

</DOCUMENT>
</SEC-DOCUMENT>