<SEC-DOCUMENT>0001445546-25-002997-index.html : 20250428
<SEC-HEADER>0001445546-25-002997.hdr.sgml : 20250428
<ACCEPTANCE-DATETIME>20250428094146
ACCESSION NUMBER:		0001445546-25-002997
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20250428
DATE AS OF CHANGE:		20250428

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			abrdn Life Sciences Investors
		CENTRAL INDEX KEY:			0000884121
		ORGANIZATION NAME:           	
		EIN:				043147016
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-48561
		FILM NUMBER:		25876547

	BUSINESS ADDRESS:	
		STREET 1:		1900 MARKET STREET
		STREET 2:		SUITE 200
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19103
		BUSINESS PHONE:		6177728515

	MAIL ADDRESS:	
		STREET 1:		1900 MARKET STREET
		STREET 2:		SUITE 200
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19103

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TEKLA LIFE SCIENCES INVESTORS
		DATE OF NAME CHANGE:	20141015

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	H&Q LIFE SCIENCES INVESTORS
		DATE OF NAME CHANGE:	19920929

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST TRUST PORTFOLIOS LP
		CENTRAL INDEX KEY:			0001184765
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			IL

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G

	BUSINESS ADDRESS:	
		STREET 1:		12O EAST LIBERTY DRIVE
		STREET 2:		SUITE 400
		CITY:			WHEATON
		STATE:			IL
		ZIP:			60187
		BUSINESS PHONE:		630-765-8000

	MAIL ADDRESS:	
		STREET 1:		12O EAST LIBERTY DRIVE
		STREET 2:		SUITE 400
		CITY:			WHEATON
		STATE:			IL
		ZIP:			60187
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>ex99_1.htm
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
Document 2 - file: ex99_1.htm

</DOCUMENT>
</SEC-DOCUMENT>