Cintas (CTAS) sees somewhat bullish flow ahead of earnings, due out after the closing bell today. Shares are up 22 cents to $27.73 and the focus is on April 30 calls. 3430 traded (24% Mid / 70% Ask) vs.1070 in open interest. One of the top trades is a lot of 328 this morning on ISE, which is an opening buyer, according to ISEE data. Implied volatility is up about 4.5 percent to 30 ahead of the results.