Pete Najarian, co-founder of OptionMonsterBOISE, Idaho ( TheStreet) -- Bullish traders charged into Micron Technology ( MU) on Thursday, hours after South Korean rival Hynix Semiconductor reported blowout results. OptionMonster's real-time tracking systems lit up with steady and aggressive buying of the September 9 calls, first for 33 cents and then for 39 cents. More than 36,000 contracts changed hands by the end of the session, some 14 times open interest in the strike. Micron rose 4.53% to $8.54 Thursday but is down 11% in the last month. Oddly, the stock gapped lower on June 29 despite reporting strong numbers. The overall market fell that same day, and the shares have been stuck at those levels ever since. Because they're using September contracts, Thursday's call-buyers have plenty of time for the stock to test the $9 level. Hynix's earnings and revenue both set records, showing the strength in the market for flash memory. SanDisk ( SNDK), another company in the space, also reported strong numbers after the bell Thursday but fell on news that its CEO is leaving. Options volume in the name was about quadruple the average level, with calls accounting for 82% of the activity. Najarian owns a call spread in Micron.