Wells Fargo analyst Edward Kelly downgraded Sprouts Farmers Market to Market Perform with an unchanged price target of $26. The stock has rallied materially since early August and now trade at its highest level since the Amazon/Whole Foods deal, Kelly tells investors in a research note. The analyst continues to view Sprouts as a solid growth story, but believes "discipline is warranted" given the intensely competitive food retail backdrop, headline risk associated with structural change, and the company's difficult back half of the year comparisons.