On September 18, 2017, Richard Kusserow resigned from the board of directors of NantKwest, Inc. effective immediately. Mr. Kusserow's resignation was not the result of any disagreement with the company on any matter relating to the company's operations, policies or practices. On September 18, 2017, the Board appointed Frederick W. Driscoll to the Board, effective immediately, with a term expiring at the company's 2018 annual meeting of stockholders. Mr. Driscoll will also serve on the audit committee of the Board. Since 2013, Mr. Driscoll has served as Chief Financial Officer at Flexion Therapeutics, Inc.