Cabaletta Bio, Inc. — Director's Dealing 2021

Nov 3, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Cabaletta Bio, Inc. (CABA)
CIK: 0001759138
Period of Report: 2021-11-01

Reporting Person: 5AM Ventures V, L.P. (10% Owner)
Reporting Person: 5AM Opportunities I (GP), LLC (10% Owner)
Reporting Person: 5AM Opportunities I, L.P. (10% Owner)
Reporting Person: 5AM Partners V, LLC (10% Owner)
Reporting Person: PARMAR KUSH (10% Owner)
Reporting Person: ROCKLAGE SCOTT M (10% Owner)
Reporting Person: Schwab Andrew J. (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-11-01	Common Stock	S	258456	$13.00	Disposed	1731119	Indirect
2021-11-01	Common Stock	S	36544	$13.00	Disposed	333144	Indirect

Footnotes

F1: Shares are held 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 Common Stock held by 5AM V, except to the extent of its or his pecuniary interest therein.

F2: Shares are held 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 by Opportunities, except to the extent of its or his pecuniary interest therein.