Costco (COST) stock slips after-hours even as Instacart expands same-day delivery into Europe

Shares of Costco Wholesale Corporation slipped roughly 1.3% to $940.25 in late after-hours trading on Friday, following the 4 p.m. market close. During the regular session, the stock fluctuated between $930.62 and $951.01, with about 2.4 million shares traded.

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