(Bloomberg) -- It’s shaping up as a good year for gender parity at the largest U.S. companies -- but there’s still a long way to go. Wednesday’s appointment of Jami Miscik as a General Motors Co. director brings the number of Standard & Poor’s 500 companies with women in half or more of their board seats to at least 11 this year, from about six at the end of 2017, according to Bloomberg data...