Cabaletta Bio, Inc. — Director's Dealing 2023

Dec 20, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Cabaletta Bio, Inc. (CABA)
CIK: 0001759138
Period of Report: 2023-12-19

Reporting Person: Binder Gwendolyn (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-12-19	Common Stock	M	11000	$1.01	Acquired	31000	Direct
2023-12-19	Common Stock	S	7868	$21.7585	Disposed	23132	Direct
2023-12-19	Common Stock	S	3132	$22.2201	Disposed	20000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-12-19	Stock Option (Right to Buy)	$1.01	M	11000	Disposed	2028-10-28	Common Stock (11000)	Direct

Footnotes

F1: These transactions were effected pursuant to a Rule 10b5-1 trading plan dated January 20, 2023 adopted by the Reporting Person.

F2: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.05 - $22.04. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.06 - $22.40. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F4: This option vests over four years, with 25% vested on October 11, 2019, and the remaining shares vesting in 12 equal quarterly installments thereafter.