5AM Ventures V, L.P. - Sep 7, 2021 Form 4 Insider Report for Cabaletta Bio, Inc. (CABA)

Role: 10%+ Owner
Signature: 5AM Ventures V, L.P., By: 5AM Partners V, LLC, its General Partner, By /s/ Scott M. Rocklage, Managing Member
Stock symbol: CABA
Transactions as of: Sep 7, 2021
Transactions value $: -$6,062,500
Form type: 4
Date filed: 9/9/2021, 05:34 PM
Previous filing: Aug 4, 2021
Next filing: Oct 28, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CABA	Common Stock	Sale	-$6.06M	-625K	-23.9%	$9.70	1.99M	Sep 7, 2021	See footnotes	F1
holding	CABA	Common Stock						370K	Sep 7, 2021	See footnotes	F2

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

Explanation of Responses:

Id	Content
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.

Content

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.

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.