Cabaletta Bio, Inc. — Director's Dealing 2026

Jan 21, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Cabaletta Bio, Inc. (CABA)
CIK: 0001759138
Period of Report: 2026-01-21

Reporting Person: Nichtberger Steven (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-21	Common Stock	P	45000	$2.2395	Acquired	1031483	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	363000	Indirect

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were purchased at prices ranging from $2.1985 to $2.26, inclusive. The reporting person has provided to the Issuer, and undertakes to provide any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

F2: The reporting person disclaims beneficial ownership of these securities, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.