<SEC-DOCUMENT>0000866291-21-000048-index.html : 20211101
<SEC-HEADER>0000866291-21-000048.hdr.sgml : 20211101
<ACCEPTANCE-DATETIME>20211101060131
ACCESSION NUMBER:		0000866291-21-000048
CONFORMED SUBMISSION TYPE:	S-3ASR
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20211101
DATE AS OF CHANGE:		20211101
EFFECTIVENESS DATE:		20211101

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLEGRO MICROSYSTEMS, INC.
		CENTRAL INDEX KEY:			0000866291
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				462405937
		FISCAL YEAR END:			0325

	FILING VALUES:
		FORM TYPE:		S-3ASR
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-260647
		FILM NUMBER:		211365199

	BUSINESS ADDRESS:	
		STREET 1:		955 PERIMETER ROAD
		CITY:			MANCHESTER
		STATE:			NH
		ZIP:			03103
		BUSINESS PHONE:		(603) 626-2300

	MAIL ADDRESS:	
		STREET 1:		955 PERIMETER ROAD
		CITY:			MANCHESTER
		STATE:			NH
		ZIP:			03103

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGRO MICROSYSTEMS INC
		DATE OF NAME CHANGE:	19900730
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3ASR
<SEQUENCE>1
<FILENAME>s-3asr_1112021.htm
<DESCRIPTION>S-3ASR
<TEXT>
Document 1 - file: s-3asr_1112021.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.3
<SEQUENCE>2
<FILENAME>exhibit43.htm
<DESCRIPTION>EX-4.3
<TEXT>
Document 2 - file: exhibit43.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>exhibit51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 3 - file: exhibit51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>4
<FILENAME>exhibit232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 4 - file: exhibit232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>algmlogo.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: algmlogo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>lathamlogoa.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: lathamlogoa.jpg

</DOCUMENT>
</SEC-DOCUMENT>