Form 4 Filing for Altimmune, Inc. - Officer/Director Transaction

This filing details a Form 4 submission for Altimmune, Inc. (ALT) concerning a transaction by reporting owner Schafer Klaus. On May 1, 2026, Mr. Klaus was granted 48,800 stock options with an exercise price of $2.82 per share. These options are part of the company's non-employee director compensation policy. The options vest in equal monthly installments over 12 months following the grant date, contingent upon continued service. Following this transaction, Mr. Klaus holds 48,800 shares underlying these options.