Select Sector Homebuilders (XHB) is up 2 cents to $13.53 and making a run to session highs. 42.6K Dec 16 calls traded, including a block of almost 40K contracts on the ISE for 57.5 cents, which is an opening customer buyer, according to sentiment data. Meanwhile, another investor entered a substantial reverse diagonal–buying 20000 Sep 14 calls, while selling 20000 Dec 16 calls. The bullish flow comes the day after a report on June existing home sales improved more than economists expected. New home sales data are scheduled for Monday and the Case Shiller Home Price Index is due out Tuesday.