Seamless and GrubHub, two food-delivery services providers, have agreed to merge. The combined company's online and mobile platforms will serve diners and companies in more than 500 American cities from more than 20,000 local takeout restaurants. Seamless and GrubHub have both taken in private investments over the past few years. Spectrum Equity Investors and Warburg Pincus have made separate minority growth investments in Seamless; GrubHub has taken in several rounds of VC investments from the likes of Benchmark Capital, Lightspeed Venture Partners and Greenspring Associates, among others. Shareholders in both companies will have significant representation in the combined company's Board of Directors.