ti- /A such persons against certain liabilities. These indemnification provisions and the indemnification agreements entered into between the Registrant and its officers and directors may be sufficiently broad to permit indemnification of the Registrant's officers and directors for liabilities (including reimbursement of expenses incurred) arising under the Securities Act of 1933, as amended (Securities Act). The underwriting agreement filed as Exhibit 1.1 to this registration statement provides for indemnification by the underwriters of the Registrant and its officers and directors for certain liabilities arising under the Securities Act and otherwise. Item 15. Recent Sales of Unregistered Securities. Common Stock Issuances In July 2015, the Registrant sold 3,777 shares of its common stock, in consideration for services previously rendered by a deceased employee, to a beneficiary of the employee, at a purchase price of approximately $0.01 per share, for an aggregate purchase price of approximately $37.77. Preferred Stock Issuances From July 2012 through September 2012, the Registrant sold an aggregate of 20,164.210 shares of its Series D convertible preferred stock to 21 accredited investors at a purchase price of approximately $11.014 per share, for an aggregate purchase price of approximately $222.1 million. From September 2014 through October 2015; the Registrant sold an aggregate of 11,640,347 shares of its Series E convertible preferred stock to 12 accredited investors at a purchase price of approximately $15.46345 per share, for an aggregate purchase price of approximately $180.0 million. Option and RSU Issuances Since June 1, 2012, the Registrant granted to its directors, officers, employees, consultants, and other service providers options to purchase an aggregate of 119,745,206 shares of its common stock under its equity compensation plans at exercise prices ranging from approximately $2.728 to $15.39 per share. Since June 1, 2012, t