day period of quarterly settlement and expiration of four different types of december futures and options contracts. the witching period, which ends today, is an event that can cause greater volume and volatility in trading. shares of citigroup rose. the bank)s chief executive, speaking at an investor day in new york, said citigroup will focus on organic growth in the united states in 2006 rather than growth through acquisitions. citigroup shares were up 0.6 percent at $49.41. worries about a transit strike in new york city on friday subsided a bit. transit workers began a partial strike on some private bus lines but threatened to extend the action throughout the city unless agreement was reached on a new contract. --spa 23:21 local time 20:21 gmt nnnn
