https://www.reuters.com/article/us-grubhub-results/grubhub-results-forecast-miss-estimates-shares-tank-idUSKCN1PW1NK >GrubHub Inc reported lower-than-expected quarterly results on Thursday and forecast adjusted earnings before interest, tax, depreciation and amortization (EBITDA) for the full year below Wall Street estimates, sending its shares down 21 percent to a two-year low.