Form 4 Filing for Nathan Steven D

Nathan Steven D, a director at Gossamer Bio, Inc. (GOSS), was granted 10,000 stock options on September 23, 2026. These options, exercisable at $10.99 per share, are for the company's Common Stock and will fully vest on September 22, 2036, provided Mr. Nathan Steven D continues his service on the board of directors. The entire grant of 10,000 shares becomes fully vested and exercisable on the first anniversary of the grant date, subject to continued service. The transaction is reported on Form 4.