** Shares of drug developer CATB.O up 38.7% at $2.83 in
extended trade - their highest in more than 2 months
** Stock is second biggest pct gainers across U.S. exchanges
after the bell
** Investment manager RA Capital Management LP discloses
7.5% passive stake in CATB as of June 8 - SEC filing (https://bit.ly/3zwP4je)
** CATB's lead candidate is QLS-215, a monoclonal antibody
designed to treat Hereditary Angioedema - a genetic disorder
** Stock had fallen 4.7% YTD up to the last close
(Reporting by Amruta Khandekar)
((Amruta.Khandekar@thomsonreuters.com;))