Absolutely - rather predictably, but only within the segment I use. If you're an HFT trader you can't win. But if you have patterns you've noticed, can act on and encode... well quite frankly it's incredibly consistent on baskets of stocks (not daily), but very much based on a variety of characteristics.
Over the last year I've met two to three traders (as in big bank) who literally do this for weeks.
I had assumed the evil Goldmans of the world had thrown enough cloud power at everything to find ever free penny already