I like to keep an eye out for winning businesses that are shaking up the status quo. That's why I've had my eye on GrubHub (NYSE: GRUB) for some time. Investors who bought into this fast-growing company at its IPO in 2014 have already tripled their money. While the company sports a nosebleed valuation and is currently trading near a 52-week high, I still think that investors can win by buying into this business today.Image source: GrubHub.In 2004, Matt Maloney was hungry and decided that he was in the mood for delivery.