The Chicago Mercantile Exchange (known in the financial world as “the Merc”) is the busiest Futures exchange in the world: a hair-raising, high-pressure den of iniquity with enough yelling, bullying, and mayhem to rattle even the toughest of hardball traders. And if you’re a woman, the Merc can be the seventh circle of hell, given the sexual harassment, verbal vulgarity, and blatant condescension that comes with the turf. But that fact hasn’t stopped a handful of talented and determined women from crashing the frat party of the Merc—and making millions at the riskiest form of trading while they’re at it.