WDC · PEAD → 0

Western Digital reported Q1 FY2027 EPS of $4.43 on 2026-10-22, beating the $3.99 consensus by $0.44 (+11.03%).

Print-day reaction was −6.43% versus the prior close, a sharp sell-the-news move despite the EPS beat, dragging the stock well below its pre-earnings range. The overnight gap to the T+1 open extended the damage by another −2.28%, confirming no after-hours stabilisation. Over the following two trading days (T+1 through T+3) the stock recovered strongly, drifting +10.83% and recouping most of the initial loss. Cumulative abnormal return of +1.07% versus SPY.US sits inside the ±3% neutral band, yielding a PEAD verdict of none with conviction 0; the drift offset but did not decisively outrun the initial reaction, leaving no high-confidence drift read through 2027-01-19.