Top equity options trades so far today are upside call buyers in Citi (C). Shares are off 4 cents to $3.67 and, after a 10.5 percent month-to-date slide, are once again probing support lows around $3.65. Meanwhile, in the options market, one player paid 9 cents per contract for 15000 Oct 4 calls. Another paid 4 cents each for 17,000 Dec 5 calls. A third big print is a block of 11,000 Dec 3 puts on the 9 cent bid. Some or all of these contracts might be closing. Citi has significant open interest. In fact, of the top 20 largest open interest in the options market today, 18 are Citi puts or calls. The top 15 are Citi options. Meanwhile, implied volatility has risen 10.5 percent to 41.5 today, compared to a 52-week high and low ofa bout 78 and 30.