MKSI · PEAD ↓ 71

MKS Instruments reported Q2 2026 EPS of $3.30 on 2026-08-05, beating the $2.94 consensus by $0.36 (+12.2%).

Print-day reaction was −2.4% from the prior close, with the stock sliding through the session despite the headline EPS beat. The overnight gap to the T+1 open accelerated the damage by a further −7.1%, signalling sustained selling pressure after hours with no stabilisation bid. Over the following two trading days (T+1 close through T+3 close), the price drifted an additional +0.4%, a negligible partial recovery that left the cumulative loss largely intact. Cumulative abnormal return of −9.1% versus SPY.US firmly places this in PEAD short territory — drift has extended, not reversed, the initial reaction; the read runs through 2026-11-02.