Cabaletta Bio is trading 5.6% lower at $1.52 on October 21, 2026; the cause of the decline remains unclear. - It closed up 8.78% at $1.61 on October 20, reversing that move. - No company-specific announcement explaining the decline appeared in available search results; its investor-relations news page lists October 5 as its latest press release. - The broad market was higher, so overall market direction does not clearly explain the decline.