Form 4 Filing for Allegiant plc

This filing details a transaction by Joseph Blasko, SVP and General Counsel of Allegiant plc. On July 2, 2026, Mr. Blasko disposed of 145 ordinary shares at a price of $139.92 per share. This transaction was made to cover tax withholding obligations upon the vesting of a restricted stock unit award. Following this transaction, Mr. Blasko owns 2,764 shares of Allegiant plc. The filing was signed by Tandra M. Foster, acting as Attorney-In-Fact, on July 6, 2026.