Cabaletta Bio, Inc. — Director's Dealing 2019

Oct 30, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Cabaletta Bio, Inc. (CABA)
CIK: 0001759138
Period of Report: 2019-10-29

Reporting Person: Redmile Group, LLC (10% Owner)
Reporting Person: Green Jeremy (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-10-29	Common Stock	C	696378	—	Acquired	696378	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-10-29	Series B Convertible Preferred Stock	$	C	1044568	Disposed		Common Stock (696378)	Indirect

Footnotes

F1: The Series B Convertible Preferred Stock converted into shares of the Issuer's common stock upon the closing of the Issuer's initial public offering on a 1-for-0.66667 basis and had no expiration date.

F2: These securities are directly owned by certain private investment vehicles managed by Redmile Group, LLC ("Redmile") and may be deemed beneficially owned by Redmile as investment manager of such private investment vehicles. The reported securities may also be deemed beneficially owned by Jeremy Green as the principal of Redmile. The Reporting Persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Persons are the beneficial owners of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.