How Does Costco Make Money? By Scalper1 | January 9, 2013 0 Comment Costco ( COST ) is the largest warehouse retailer in the U.S. with over 400 warehouse clubs across the country. More: How Does Costco Make Money? Related posts: Earnings Scorecard: Costco – Analyst Blog Earnings Preview: Costco – Analyst Blog Costco Wholesale Corporation (COST) Ex-Dividend Date Scheduled for December 06, 2012 Still Neutral on Costco – Analyst Blog