Qtrly Comparable Sales Total Company Was Up 6.6%

Costco Wholesale Corp COST:

• QTRLY COMPARABLE SALES TOTAL COMPANY WAS UP 6.6%

• QTRLY ADJUSTED COMPARABLE SALES TOTAL COMPANY WAS UP 7.1%

• ORATION REPORTS FIRST QUARTER FISCAL YEAR 2023 OPERATING RESULTS

• QTRLY NET SALES FOR THE FIRST QUARTER INCREASED 8.1 PERCENT, TO $53.44 BILLION

• QTRLY E-COMMERCE COMPARABLE SALES DOWN 3.7%

• QTRLY EARNINGS PER SHARE $3.07

• Q1 EARNINGS PER SHARE VIEW $3.11 — REFINITIV IBES DATA

• Q1 REVENUE VIEW $54.64 BILLION — REFINITIV IBES DATA