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May 31, 2026 · Phase 3 readout

VRTX Phase 3 readout: a positive outcome, +8.3%

On May 31, 2026, CTX001 — Vertex Pharmaceuticals Incorporated (Beta-Thalassemia) reached its Phase 3 readout. The result was a positive outcome, and the stock moved +8.3% in the window around the event.

The move

$460.87
1d before
$499.17
Event day
$492.38
1d after
$469.34
5d after

Pre-catalyst setup

-4.4%
30-day run-up
3456%
30-day volatility
0.8×
volume spike