Form 4 Filing for Allegiant plc

This Form 4 filing details a transaction by Nicole Parent Haughey, a director at Allegiant plc. On June 5, 2026, 292 ordinary shares were disposed of at a price of $130.27 per share. These shares were withheld by the issuer to cover tax obligations related to a restricted stock unit award vesting. Following this transaction, Nicole Parent Haughey owns 7938 shares. The filing was signed on June 9, 2026, by Tandra M. Foster as Attorney-In-Fact.