On September 6, 2023, Kristina Burow resigned from the Board of Directors (the ?Board?) of Gossamer Bio, Inc. Ms. Burow?s decision to resign from the Board is due to her other board commitments and not as a result of any disagreement with the Company concerning any matter relating to its operations, policies or practices. Effective upon Ms. Burow?s resignation, the size of the Board was reduced from six to five directors and the number of Class III directors was reduced from two to one director.