EMERYVILLE, Calif., Sept. 27, 2018 (GLOBE NEWSWIRE) -- Gritstone Oncology, Inc. (Nasdaq:GRTS) today announced the pricing of its initial public offering of 6,666,667 shares of common stock at a public offering price of $15.00 per share, before underwriting discounts and commissions. All of the shares of common stock are being offered by Gritstone Oncology. In addition, Gritstone Oncology has granted the underwriters a 30-day option to purchase up to an additional 1,000,000 shares of common stock at the initial public offering price, less the underwriting discounts and commissions. Gritstone Oncology’s common stock is expected to begin trading on The Nasdaq Global Select Market on Sept. 28, 2018, under the ticker symbol “GRTS”. The gross proceeds from the offering, before deducting underwriting discounts and commissions and other offering expenses payable by Gritstone Oncology, are expected to be approximately $100 million, excluding any exercise of the underwriters’ option to purchase additional shares. The offering is expected to close on Oct. 2, 2018, subject to the satisfaction of customary closing conditions.