SC 13G/A: Cabaletta Bio, Inc.

AI Summary

SC 13G/A filing by Cabaletta Bio, Inc..

Risk Assessment

Risk Level: low

Key Financial Figures

• $0.00001 — me of Issuer) Common Stock, par value $0.00001 per share (Title of Class of Securiti

Filing Documents

• formsc13ga.htm (SC 13G/A) — 88KB
• 0001493152-24-006619.txt ( ) — 89KB

for additional information

Item 4 for additional information. CUSIP No. 12674W109 SCHEDULE 13G 1 NAME OF REPORTING PERSONS Commodore Capital Master LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5 SOLE VOTING POWER 0 6 SHARED VOTING POWER 1,900,000* 7 SOLE DISPOSITIVE POWER 0 8 SHARED DISPOSITIVE POWER 1,900,000* 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,900,000* 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.4%* 12 TYPE OF REPORTING PERSON OO *See

for additional information

Item 4 for additional information. CUSIP No. 12674W109 SCHEDULE 13G Item 1. (a) Name of Issuer Cabaletta Bio, Inc. (the “Issuer”) Item 1. (b) Address of Issuer’s Principal Executive Offices 2929 Arch Street, Suite 600, Philadelphia, Pennsylvania 19104 Item 2. (a, b, c) Names of Person Filing, Address of Principal Business Office, Citizenship: This report on Schedule 13G is being filed by Commodore Capital LP, a Delaware limited partnership (the “Firm”) and Commodore Capital Master LP, a Cayman Islands exempted limited partnership (“Commodore Master”). The address for the Firm and Commodore Master is: 444 Madison Avenue, Floor 35, New York, New York 10022. Item 2. (d) Title of Class of Securities Common Stock, par value $0.00001 per share (the “Common Stock”) Item 2. (e) CUSIP No.: 12674W109 Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person filing is a: N/A CUSIP No. 12674W109 SCHEDULE 13G Item 4. Ownership As reported in the cover pages to this report, the ownership information with respect to the Firm is as follows: (a) Amount Beneficially Owned: 1,900,000* (b) Percent of Class: 4.4%* (c) Number of Shares as to which such person has: (i) Sole power to vote or to direct the vote: 0 (ii) Shared power to vote or to direct the vote: 1,900,000* (iii) Sole power to dispose or to direct the disposition of: 0 (iv) Shared power to dispose or to direct the disposition of: 1,900,000* As reported in the cover pages to this report, the ownership information with respect to Commodore Master is as follows: (a) Amount Beneficially Owned: 1,900,000* (b) Percent of Class: 4.4%* (c) Number of Shares as to which such person has: (i) Sole power to vote or to direct the vote: 0 (ii) Shared power to vote or to direct the vote: 1,900,000* (iii) Sole power to dispose or to direct the disposition of: 0 (iv) Share

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