SOUTH SAN FRANCISCO, Calif.--(BUSINESS WIRE)--Exelixis, Inc. (Nasdaq: EXEL) today announced the completion of its underwritten public offering of 12,650,000 shares of its common stock, including 1,650,000 shares sold pursuant to the full exercise of an option previously granted to the underwriters to purchase additional shares. All of the shares were offered by Exelixis. Exelixis anticipates that its aggregate net proceeds from the offering will be approximately $65.0 million after deducting the underwriting discount and estimated offering expenses payable by Exelixis.