Texas Capital Bancshares (TCBI) 10-Q 2017 Q3 Quarterly report

EXHIBIT 32.1

CERTIFICATION

In connection with the Quarterly Report on Form 10-Q of Texas Capital Bancshares, Inc. (the “Company”) for the period ending September 30, 2017 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, C. Keith Cargill, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1. The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report, fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ C. Keith Cargill

C. Keith Cargill

Chief Executive Officer

Date: October 19, 2017