Why Is CytomX Therapeutics ( $CTMX ) Stock Down -10.63% Today? (Find out why any stock moved today on Tickeron.) CTMX shares fell roughly 10.63% on Tuesday, sliding from a prior close of $3.20 to about $2.86 in intraday trading. The decline extended a pullback that began after a Wall Street Zen downgrade to "Strong Sell" and roughly $1.2 million in insider stock sales. Profit-taking erased most of the gains generated earlier in the period by FDA Fast Track designation for the lead colorectal cancer program, Varseta-M. $MLEC $EDIT $ABOS $IMTX $VKTX