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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1759138	Cabaletta Bio Inc.	CABA	()	4

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1219014	M Scott Rocklage	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	No
1598549	J. Andrew Schwab	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	No
1664281	Kush Parmar	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	No
1674324	5Am Ventures V, L.p.	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	No
1753000	5Am Opportunities I, L.p.	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	No
1790778	5Am Opportunities I (Gp), Llc	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	No
1791889	5Am Partners V, Llc	501 2Nd Street, Suite 350 San Francisco CA 94107	No	No	Yes	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	Disposition	2020-12-10	261,084	$14.75	2,953,634	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2020-12-10	36,916	$14.75	417,629	No	4	S	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnotes
No	4	S	Indirect	See footnotes

Footnotes

Shares are held directly by 5AM Ventures V, L.P. ("5AM V").
5AM Partners V, LLC ("5AM Partners") is the sole general partner of 5AM V. Dr. Kush Parmar, Andrew J. Schwab and Dr. Scott M. Rocklage are managing members of 5AM Partners and may be deemed to have shared voting and investment power over the shares beneficially owned by 5AM V. Each of 5AM Partners, Dr. Parmar, Mr. Schwab and Dr. Rocklage disclaims beneficial ownership of the shares of Preferred Stock held directly by 5AM V, except to the extent of its or his pecuniary interest therein.
Shares are held directly by 5AM Opportunities I, L.P. ("Opportunities").
5AM Opportunities I (GP), LLC ("Opportunities GP") is the sole general partner of Opportunities. Andrew J. Schwab and Dr. Kush Parmar are managing members of Opportunities GP and may be deemed to have shared voting and investment power over the shares beneficially owned by Opportunities. Each of Opportunities GP, Mr. Schwab and Dr. Parmar disclaims beneficial ownership of the shares of Common Stock held directly by Opportunities, except to the extent of its or his pecuniary interest therein.