The company said it anticipates that same-store sales at Sam's Club will increase this year by 7.5% to 8.5%, excluding fuel and tobacco. Walmart shares have trailed other pandemic beneficiaries in the retail industry. As of Monday's close, Walmart shares were up about 5% this year compared with Target and Kroger, which have seen shares increase 49% and 37%, respectively, in 2021. It also lags behind the S&P 500's 33% gain. Read the company's press release here. —CNBC's Courtney Reagan and Robert Hum contributed to this report.