Michael Gerard - 21 Jan 2026 Form 4 Insider Report for Cabaletta Bio, Inc. (CABA)

Role: General Counsel
Signature: By: /s/ Michael Gerard
Issuer symbol: CABA
Transactions as of: 21 Jan 2026
Net transactions value: +$14,979
Form type: 4
Filing time: 21 Jan 2026, 18:53:42 UTC
Previous filing: 19 May 2025
Next filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gerard Michael	General Counsel	C/O CABALETTA BIO, INC., 2929 ARCH STREET, SUITE 600, PHILADELPHIA	By: /s/ Michael Gerard	21 Jan 2026	0001881529

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CABA	Common Stock	Purchase	$14,979	+6,600		$2.27	6,600	21 Jan 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 is a weighted average price. These shares were purchased at prices ranging from $2.269 to $2.2699, inclusive. The reporting person has provided to the Issuer, and undertakes to provide any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Content

The price reported in Column 4 is a weighted average price. These shares were purchased at prices ranging from $2.269 to $2.2699, inclusive. The reporting person has provided to the Issuer, and undertakes to provide any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.