Mark Simon, Director at Cabaletta Bio, Inc. (CABA), bought 11,061 shares at $2.28 ($25K) on 2026-01-21, disclosed to the SEC on 2026-01-21.
Open-market purchase of $25k CABA by Director. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history). Context: insider career grade B.
Nothing distinguishes this filing.