CABA Form 3 shows Chief Commercial Officer with no holdings

Rhea-AI Filing Summary

Cabaletta Bio (CABA) filed a Form 3 as an initial statement of beneficial ownership for its Chief Commercial Officer. The filing, effective as of 10/13/2025, states that no securities are beneficially owned. An Exhibit 24 Power of Attorney is included, and the document is signed by an attorney-in-fact.

This is a routine administrative disclosure noting the officer’s current ownership status at the time of joining or becoming subject to reporting.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Gavel Steve

(Last) (First) (Middle)

C/O CABALETTA BIO, INC.

2929 ARCH STREET, SUITE 600

(Street)

PHILADELPHIA PA 19104

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/13/2025

3. Issuer Name and Ticker or Trading Symbol
Cabaletta Bio, Inc. [ CABA ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF COMMERCIAL OFFICER

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Michael Gerard, Attorney-in-Fact	10/15/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Cabaletta Bio (CABA) disclose in this Form 3?

The filing states that the Chief Commercial Officer currently beneficially owns no securities.

Whose ownership does the CABA Form 3 cover?

It covers the company’s Chief Commercial Officer as the reporting person.

What is the effective date of the ownership status in this Form 3?

The effective date noted is 10/13/2025.

Does the filing include supporting documentation?

Yes. It includes Exhibit 24 - Power of Attorney.

Who signed the Form 3 for Cabaletta Bio?

It was signed by /s/ Michael Gerard, Attorney-in-Fact on 10/15/2025.

Is this Form 3 related to any transaction or sale?

No. The filing indicates no securities are beneficially owned and lists no transactions.