White men still overwhelm the boardroom but, for the first time, women and minorities together accounted for half of the new independent directors appointed by corporate America this year, a recruitment firm said on Thursday.

Executive recruiting firm Spencer Stuart tracked appointments of independent directors made by S&P 500 companies — firms whose shares are listed on major U.S. stock indexes, NYSE or NASDAQ.

It found that diversity was on the rise, signaling its growing importance as firms aim to better reflect wider society.