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November 7, 2024 · earnings

AMPH earnings: a negative outcome, -13.7%

On November 7, 2024, Amphastar Pharmaceuticals, Inc. reached its earnings. The result was a negative outcome, and the stock moved -13.7% in the window around the event. It had already run +9.3% in the 30 days into the catalyst — the kind of pre-event run-up that often precedes binary readouts.

The move

$53.40
1d before
$46.09
Event day
$48.31
1d after
$47.71
5d after

Pre-catalyst setup

+9.3%
30-day run-up
2605%
30-day volatility
2.2×
volume spike