Post Holdings Inc (NYSE: POST). Add to Watch List. Set Alert. Delayed Data. As of Jul / %. Today's Change. Today|||Week Range. Stock quote for Post Holdings, Inc. Common Stock (POST) - Get real-time last sale and extended hours stock prices, company news, charts, and. View detailed financial information, real-time news, videos, quotes and analysis on Post Holdings Inc (NYSE: POST). Explore commentary on Post Holdings Inc.