NEW YORK (AP) — The number of women sitting at the table in corporate boardrooms across the country is rising very slowly, but it's rising.

Just over 15 percent of all director seats at publicly traded U.S. companies were held by women as of Dec. 31, according to a study by Equilar, a corporate research firm. That's up from 14 percent a year earlier and from 12 percent in 2013.

So, the trend is toward more equal representation on boards, but parity won't happen until the end of 2055 unless the pace picks up, according to Equilar. That's nearly 40 years away, which may be about when girls born...