REGN · PEAD → 21

Regeneron reported Q1 2026 EPS of $9.47 on 2026-04-30, beating the $9.16 consensus by $0.31 (+3.4%); no prior-year comparable is available in our feed.

Print-day reaction was +3.0% versus the prior close, as REGN opened firm and extended through the session to close at $707.06. The overnight gap to the T+1 open gave back a modest -0.6%, suggesting some profit-taking after the initial pop. Over the following two trading sessions the stock drifted just +0.1%, offering neither meaningful continuation nor reversal of the earnings move. Cumulative abnormal return of +0.6% versus SPY.US sits well inside the ±3% threshold, yielding a PEAD none verdict; with conviction at 21 the signal is weak and the holding window closes 2026-07-28.