<SEC-DOCUMENT>0001193125-21-124695-index.html : 20210421
<SEC-HEADER>0001193125-21-124695.hdr.sgml : 20210421
<ACCEPTANCE-DATETIME>20210421161059
ACCESSION NUMBER:		0001193125-21-124695
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		6
CONFORMED PERIOD OF REPORT:	20210601
FILED AS OF DATE:		20210421
DATE AS OF CHANGE:		20210421

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cabaletta Bio, Inc.
		CENTRAL INDEX KEY:			0001759138
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39103
		FILM NUMBER:		21841652

	BUSINESS ADDRESS:	
		STREET 1:		2929 ARCH STREET
		STREET 2:		SUITE 600
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19104
		BUSINESS PHONE:		(267) 759-3100

	MAIL ADDRESS:	
		STREET 1:		2929 ARCH STREET
		STREET 2:		SUITE 600
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19104
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>d23837ddef14a.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: d23837ddef14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g23837dsp38a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g23837dsp38a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g23837dsp38b.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g23837dsp38b.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g23837dsp38c.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g23837dsp38c.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g23837dsp39.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g23837dsp39.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g23837g22a44.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g23837g22a44.jpg

</DOCUMENT>
</SEC-DOCUMENT>