Guggenheim analyst Matthew DiFrisco said a key take-away from the firm's Restaurant Summit was that the universe of delivery partners vying for near-term market share and long-term profit capture continues to be "dynamic and not shrinking," which leads him to conclude that investor concerns relative to the rate of growth and profitability the GrubHub model can support won't soon abate. Given the "steadfast growth" of multiple competitors, he now sees limited opportunity for multiple expansion at GrubHub, leading DiFrisco to lower his price target on the shares to $72 from $110 and remove his Best Idea designation from the stock. However, DiFrisco keeps a Buy rating on GrubHub shares.