Cemex (CX) adds 2 cents to $8.78 and an investor buys a 5000-contract block of Jul 9 puts at 39 cents each. Looks opening and possibly tied to 173K shares at $8.75. Shares of the Mexican cement company are up 1.9 percent in the past three days, but down 18 percent year-to-date. Earnings were last reported 2/3.