BUZZ — Australia's Guzman y Gomez falls after chairman sells part of his stake
* Shares of Australia's Guzman y Gomez 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