257. a variety of factors made thursday on wall street a true rollercoaster ride. quadruple witching involved the monthly expiration of four types of futures and stock options. that swung the s&p 500 more than 1% between its session low and high for the day. worry greek debt trouble would weigh in also domed the markets. the day s data was mixed. june s mid-atlantic factory activity, unexpectedly shrank, another sign of manufacturing weakness. on the bright side, americans signing up for jobless benefits fell last week. and a push to housing starts and building permits rose in may. home depot rose on that report. and analysts upgrade. kroger drop jumped 4%. and after the bell, research in motion plunges 14% after reporting a profit drop and