Costco stock today: COST at $862 as New Year’s Day shuts markets; SEC insider sale filing in focus
NEW YORK, January 1, 2026, 10:52 ET — Market closed. Costco Wholesale Corporation (COST.O) shares last closed down 0.4% at $862.34, after trading between $861.42 and $867.76 in the year’s final session on Wednesday. U.S. stock markets are closed on Thursday for the New Year’s Day holiday. The holiday lull matters because liquidity thins out, making prices more sensitive to…