Form 4 Filing for Harrington Robert Arthur - CYTOKINETICS INC

This filing details a transaction by Harrington Robert Arthur, a director at CYTOKINETICS INC. On April 15, 2026, Mr. Arthur acquired 191 shares of common stock under the Director Equity in Lieu of Cash Retainer Program. These shares were fully vested at the time of the grant. The transaction code is 'A' for acquisition, and the price per share was $65.37. Following this transaction, Mr. Arthur now holds 18,930 shares of common stock, with ownership designated as direct.