Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) : October 27, 2016 CULLEN/FROST BANKERS, INC. (Exact name of issuer as specified in its charter) Texas 001-13221 74-1751768 (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification No.) 100 West Houston Street, San Antonio, Texas 78205 (Address of principal executive offices) (Zip Code) (210) 220-4011 (Registrant's telephone number, including area code) Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below): ¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Item 8.01    Other Events Attached as Exhibit 99.1 and incorporated into this item by reference is a press release issued by the Registrant on October 27, 2016 regarding the disclosure of summary of results of its annual supervisory stress test in accordance with the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations of the Board of Governors of the Federal Reserve System promulgated thereunder. Item 9.01    Financial Statements and Exhibits (d)   Exhibits: 99.1 Press Release dated October 27, 2016 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. CULLEN/FROST BANKERS, INC. By:     /s/ Jerry Salinas     Jerry Salinas Group Executive Vice President and Chief Financial Officer Dated:    October 27, 2016 EXHIBIT INDEX Exhibit Number   Description          99.1   Press Release dated October 27, 2016