(WSM), parent of numerous home goods brands, sank 4.7%, losing the most of any stock in the S&P 500. -Michael BrombergEnergy Was Worst-Performing Sector in S&P 500 Monday By far the poorest performance of any sector in the S&P 500 Monday was that of energy shares. Devon Energy (DVN), Diamondback Energy (FANG), ConocoPhillips (COP), and ExxonMobil (XOM) all were among the list of top S&P 500 decliners today. Morgan Stanley analysts have downgraded Novo Nordisk’s stock, pointing in part to falling sales of weight-loss drugs Ozempic and Wegovy. Morgan Stanley analysts say artificial intelligence could make it even better.