Yum! Brands March weekly calls active amid renewed spin-off speculation Yum! Brands March weekly 79 and 80 calls are active on total call volume of 10,500 contracts (500 puts) amid renewed spin-off speculation. March weekly call option implied volatility is at 30, April is at 23, May is at 26; compared to its 26-week average of 22 according to Track Data. Active call volume suggests traders taking large positions for upside price movement.