COST · PEAD ↓ 76

Costco reported Q3 FY2026 results on 2026-05-28; consensus EPS was $4.98 (actual not yet in our feed).

Print-day reaction was –0.8% versus the prior close of $1,003.69, a muted but negative initial response that left the stock below its pre-earnings level. The overnight gap to the T+1 open added a further –0.9%, suggesting no post-close recovery and an extending fade into the next session. Over the following two trading days the price drifted an additional –0.2%, sustaining the directional sell-off with no meaningful bounce; total 3-day return came to –4.9%. Cumulative abnormal return of –6.1% versus SPY.US firmly places this in PEAD short territory; the documented drift pattern holds through 2026-08-25.