Women make up less than 5 percent of S&P 500 CEOs. Aside from being a sad reflection of institutionalized sexism, that could also be a huge, huge mistake as far as making money is concerned. According to “Shark Tank” investor Kevin O’Leary, whose portfolio currently contains more than two dozen companies, each of the most successful ventures he’s funded of late has been run by a woman — and that’s about the only thing the companies have in common.