cboe global markets inc posted firstquarter adjusted earnings and revenue that beat analyst estimates due to a strong performance by its core derivatives franchise and contributions from its data and access solutions businesses net income was down 20 from the yearago quarter to 1096 million or 102 a share which the chicagobased exchange operator attributed to an unfavorable decision in tax court that drove its effective tax rate to 513 from 289 a year ago stripping out onetime items adjusted firstquarter earnings rose 13 to 173 a share beating analyst expectations by 5 cents a share according to factset net revenue removing the cost of revenues rose 14 from the yearago period to 418 million due in part to increases in net transaction and clearing fees analysts polled by factset had forecasted revenue of 415 million