Atheros Communications (ATHR, news, chart, volatility) calls are active. Shares of the Santa Clara, California semiconductor company are up 91 cents to $23.06 after Collins Stewart resumed coverage on the stock with a Buy rating and a $28 price target. The firm says the target market for Atheros’ products is growing and the company can grow even if market share stays the same. Bullish trading is being seen in the options market. Total options volume is running three times the usual. 14,000 contracts have traded, compared to 792 puts. The October and November 22.5 and 25 calls are seeing action, with about 55 percent of today’s volume trading offerside.