Australia's Guzman y Gomez falls after chairman sells part of his stake
** Shares of Australia's Guzman y Gomez GYG.AX fall as much as 7.1% to A$25.020, their biggest intraday pct fall since June 3
** Stock hits its lowest level since October 2
** Mexican-themed fast-food chain says chairman Guy Russo has sold 1.39 million shares via an off-market block trade
** Post-sale, Russo retains 4.69 million shares, equivalent to about 77% of his pre-sale holding
** YTD, stock up 22.3%, including the session's moves