CBOE Holdings, the largest options exchange in the U.S. with a volume of 1.13 billion contracts traded in 2009, announced terms for its IPO on Thursday. The Chicago, IL-based company plans to raise $328 million by offering 11.7 million shares at a price range of $27-$29. At the mid-point of the proposed range, CBOE will command a market value of $2.9 billion. The options exchange, which was founded in 1973 and booked $426 million in sales last year, plans to list on the NASDAQ under the symbol CBOE. Goldman, Sachs & Co. is the lead among the eighteen underwriters on the deal, which is expected to price the week of June 14th.