Nichtberger Steven - 21 Jan 2026 Form 4 Insider Report for Cabaletta Bio, Inc. (CABA)

Reporting relationship: President & CEO, Director
Issuer ticker: CABA
Reported as of: 21 Jan 2026
Net transaction value: +$100,778
SEC form: 4
Accepted by SEC: 21 Jan 2026, 18:54:24 UTC
Prior SEC filing: 19 May 2025
Next SEC filing: 02 Mar 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Michael Gerard, as Attorney-in-Fact

Key filing fact

Nichtberger Steven filed Form 4 for Cabaletta Bio, Inc. (CABA) on 21 Jan 2026.

Key facts

This page summarizes Nichtberger Steven's Form 4 filing for Cabaletta Bio, Inc. (CABA).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 21 Jan 2026, 18:54.

Change

Previous filing in this sequence was filed on 19 May 2025.
Current net transaction value: +$100,778.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001487989 Primary reporting owner

Nichtberger Steven

Relationship: President & CEO, Director
Address: C/O CABALETTA BIO, INC., 2929 ARCH STREET, SUITE 600, PHILADELPHIA
Signature: By: /s/ Michael Gerard, as Attorney-in-Fact
Signature date: 21 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CABA transaction

Common Stock

Purchase

Transaction value: $100,778
Shares: +45,000
Change %: +4.6%
Price: $2.24
Shares after: 1,031,483
Date: 21 Jan 2026
Ownership: Direct
Footnotes: F1

CABA holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 363,000
Date: 21 Jan 2026
Ownership: By 2017 Nichtberger Family Trust
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote 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.

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.