Costco's E-Commerce Sales are Soaring. What Investors Need to Know.

Costco Wholesale (COST -1.13%) stands alone among major national retailers in the fact that it issues monthly sales updates in between its comprehensive quarterly announcements. This report doesn't tell investors anything about how well the company did in generating profits. It also contains no data on customer traffic trends or on key engagement metrics such as membership renewals.But the report is still worth watching for its timely look at sales trends. Investors can sometimes spot early signs of shiftin ...