Comment by karenrubin

Lack of data. If I could find the historical lists of the S&P500 including CEO gender, or the entire list of Fortune 1000 companies by year, I'd look at any of the alternatives you suggest. The reality is getting the data is pretty tough, so we work with what we have. I've actually just gotten a dump of data from Morningstar that should allow me to expand the scope, but as with everything, there is work involved to make it usable....so stay tuned.