<SEC-DOCUMENT>0000053417-21-000005-index.html : 20210210
<SEC-HEADER>0000053417-21-000005.hdr.sgml : 20210210
<ACCEPTANCE-DATETIME>20210210095341
ACCESSION NUMBER:		0000053417-21-000005
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210210
DATE AS OF CHANGE:		20210210

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AILERON THERAPEUTICS INC
		CENTRAL INDEX KEY:			0001420565
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90032
		FILM NUMBER:		21609695

	BUSINESS ADDRESS:	
		STREET 1:		290 PLEASANT STREET
		STREET 2:		UNIT 112
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
		BUSINESS PHONE:		617-995-0900

	MAIL ADDRESS:	
		STREET 1:		290 PLEASANT STREET
		STREET 2:		UNIT 112
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			JENNISON ASSOCIATES LLC
		CENTRAL INDEX KEY:			0000053417
		IRS NUMBER:				132631108
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		466 LEXINGTON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		2124211000

	MAIL ADDRESS:	
		STREET 1:		466 LEXINGTON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	JENNISON ASSOCIATES CAPITAL CORP
		DATE OF NAME CHANGE:	19940511
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>ALRN1220.txt
<DESCRIPTION>13G AMENDED ANNUAL FILING (ALRN)
<TEXT>
Document 1 - file: ALRN1220.txt

</DOCUMENT>
</SEC-DOCUMENT>