Form 4 Filing for Simon Mark at Cabaletta Bio, Inc.

This filing details a Form 4 submission by Simon Mark, a director at Cabaletta Bio, Inc. (CABA), on June 10, 2026. The report covers transactions on June 9, 2026. Mark acquired 22,000 stock options with a right to buy at a price of $0.00 per share. These options are exercisable under specific vesting conditions, including full vesting on June 9, 2027, or the next annual stockholder meeting. The options expire on June 8, 2036. The underlying security is Common Stock, and following this transaction, Mark directly owns 22,000 shares. The conversion or exercise price for these options is $3.22.