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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1759138	Cabaletta Bio Inc.	CABA	Biological Products, (No Disgnostic Substances) (2836)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1791742	Gwendolyn Binder	C/O Cabaletta Bio, Inc. 2929 Arch Street, Suite 600 Philadelphia PA 19104	See Remarks	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2023-05-19	22,000	$1.01	42,000	No	4	M	Direct
Common Stock	Disposition	2023-05-19	22,000	$11.81	20,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2023-05-19	22,000	$0.00	22,000	$1.01

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
188,756		2028-10-28	No	4	M	Direct

Footnotes

These transactions were effected pursuant to a Rule 10b5-1 trading plan dated January 20, 2023 adopted by the Reporting Person.
The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.58 - $12.27. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
This option vests over four years, with 25% vested on October 11, 2019, and the remaining shares vesting in 12 equal quarterly installments thereafter.