MKSI · PEAD ↑ 100

MKS Instruments reported Q1 2026 EPS of $2.30 on 2026-05-06, beating the $2.05 consensus by $0.25 (+12.2%).

Print-day reaction was +2.1% versus the prior close, a measured positive move that kept the stock comfortably above its pre-earnings level. The overnight gap to the T+1 open was a substantial +7.6%, signalling strong after-hours conviction with no fade. Days 1–3 added a further +6.3% drift from T+1 close to T+3 close, a continuation that amplified rather than retraced the initial move. Cumulative abnormal return of +9.0% versus SPY.US over the three-day window places this firmly in PEAD long territory; the documented drift pattern is tracked through the holding window end of 2026-08-03.