Cabaletta Bio is trading 5.5% up at $1.78 in pre-market on October 14; the reason for the rebound remains unclear. - The stock closed at $1.69 on October 13. - No clear company-specific announcement explaining the rise appeared in the available search results. The latest company release found was an October 5 announcement about inducement equity awards. - Supplied pre-market index changes were modest, and no specific biotech-sector catalyst was identified.