<SEC-DOCUMENT>0001193125-20-273413-index.html : 20201021
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<ACCEPTANCE-DATETIME>20201021092606
ACCESSION NUMBER:		0001193125-20-273413
CONFORMED SUBMISSION TYPE:	S-1/A
PUBLIC DOCUMENT COUNT:		22
FILED AS OF DATE:		20201021
DATE AS OF CHANGE:		20201021

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLEGRO MICROSYSTEMS INC
		CENTRAL INDEX KEY:			0000866291
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				000000000
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		S-1/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-249348
		FILM NUMBER:		201249786

	BUSINESS ADDRESS:	
		STREET 1:		115 NORTHEAST CUTOFF
		CITY:			WORCESTER
		STATE:			MA
		ZIP:			01606
		BUSINESS PHONE:		508-853-5000

	MAIL ADDRESS:	
		STREET 1:		115 NORTHEAST CUTOFF
		CITY:			WORCESTER
		STATE:			MA
		ZIP:			01606
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<DESCRIPTION>AMENDMENT NO. 2 TO FORM S-1
<TEXT>
Document 1 - file: d38154ds1a.htm

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<FILENAME>d38154dex11.htm
<DESCRIPTION>EX-1.1
<TEXT>
Document 2 - file: d38154dex11.htm

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<DESCRIPTION>EX-3.2
<TEXT>
Document 3 - file: d38154dex32.htm

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<FILENAME>d38154dex34.htm
<DESCRIPTION>EX-3.4
<TEXT>
Document 4 - file: d38154dex34.htm

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<SEQUENCE>5
<FILENAME>d38154dex41.htm
<DESCRIPTION>EX-4.1
<TEXT>
Document 5 - file: d38154dex41.htm

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<FILENAME>d38154dex43.htm
<DESCRIPTION>EX-4.3
<TEXT>
Document 6 - file: d38154dex43.htm

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<FILENAME>d38154dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 7 - file: d38154dex51.htm

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<FILENAME>d38154dex1032.htm
<DESCRIPTION>EX-10.32
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Document 8 - file: d38154dex1032.htm

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<TYPE>EX-10.33
<SEQUENCE>9
<FILENAME>d38154dex1033.htm
<DESCRIPTION>EX-10.33
<TEXT>
Document 9 - file: d38154dex1033.htm

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<TYPE>EX-10.34
<SEQUENCE>10
<FILENAME>d38154dex1034.htm
<DESCRIPTION>EX-10.34
<TEXT>
Document 10 - file: d38154dex1034.htm

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<FILENAME>d38154dex1035.htm
<DESCRIPTION>EX-10.35
<TEXT>
Document 11 - file: d38154dex1035.htm

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<FILENAME>d38154dex1036.htm
<DESCRIPTION>EX-10.36
<TEXT>
Document 12 - file: d38154dex1036.htm

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<DESCRIPTION>EX-10.42
<TEXT>
Document 13 - file: d38154dex1042.htm

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<SEQUENCE>14
<FILENAME>d38154dex1043.htm
<DESCRIPTION>EX-10.43
<TEXT>
Document 14 - file: d38154dex1043.htm

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<FILENAME>d38154dex211.htm
<DESCRIPTION>EX-21.1
<TEXT>
Document 15 - file: d38154dex211.htm

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<SEQUENCE>16
<FILENAME>d38154dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 16 - file: d38154dex231.htm

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<FILENAME>g38154dsp017.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 17 - file: g38154dsp017.jpg

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<FILENAME>g38154dsp018.jpg
<DESCRIPTION>GRAPHIC
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Document 18 - file: g38154dsp018.jpg

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<FILENAME>g38154g01b02.jpg
<DESCRIPTION>GRAPHIC
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Document 19 - file: g38154g01b02.jpg

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<FILENAME>g38154g02c03.jpg
<DESCRIPTION>GRAPHIC
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Document 20 - file: g38154g02c03.jpg

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<FILENAME>g38154page001.jpg
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Document 21 - file: g38154page001.jpg

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<FILENAME>g38154page002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 22 - file: g38154page002.jpg

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