Cabaletta Bio, Inc. — Director's Dealing 2019

Oct 25, 2019

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Cabaletta Bio, Inc. (CABA)
CIK: 0001759138
Period of Report: 2019-10-24

Reporting Person: 5AM Ventures V, 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)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Series A Preferred Stock	$		Common Stock (3146551)		Indirect
Series B Preferred Stock	$		Common Stock (1675532)		Indirect

Footnotes

F1: These shares of Series A Preferred Stock and Series B Preferred Stock (collectively, "Preferred Stock") will automatically be converted into shares of the Issuer's Common Stock ("Common Stock"), on a 1-for-1.5 basis, immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock has no expiration date.

F2: Shares are held directly by 5AM Ventures V, L.P. ("5AM V").

F3: 5AM Partners V, LLC ("5AM Partners") is the sole general partner of 5AM V. 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, Mr. 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.