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): November 13, 2018

Spirit of Texas Bancshares, Inc.

(Exact name of registrant as specified in its charter)

1836 Spirit of Texas Way

Conroe, Texas 77301

(Address of principal executive offices) (Zip Code)

(936) 521-1836

(Registrant’s telephone number, including area code)

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:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Spirit of Texas Bancshares, Inc. (“Spirit”) held a special meeting of shareholders on November 13, 2018 (the “Special Meeting”). There were 9,795,771 shares of Spirit common stock, no par value (“Spirit Common Stock”), outstanding as of the record date and entitled to vote at the Special Meeting and 6,550,192 shares were represented in person or by proxy, which constituted a quorum to conduct business at the Special Meeting. Spirit shareholders voted on and approved the following proposals, which are described in more detail in the joint proxy statement/prospectus filed with the Securities and Exchange Commission on October 18, 2018 pursuant to Rule 424(b):

Spirit shareholders did not vote on the third proposal, which was a proposal to adjourn the Special Meeting to solicit additional proxies in favor of the first two proposals, as management determined it was not necessary to do so.

On November 13, 2018, Comanche shareholders approved at a special meeting of shareholders the Reorganization Agreement and the transactions contemplated thereby, including the Merger.

In addition, on November 14, 2018, Spirit received regulatory approval to complete the Merger from the Texas Department of Savings and Mortgage Lending. As Spirit had already received regulatory approvals from the Federal Reserve Bank of Dallas, acting on delegated authority from the Board of Governors of the Federal Reserve System, and the Federal Deposit Insurance Corporation to complete the Merger and to merge The Comanche National Bank, a national banking association and subsidiary of Comanche, with and into Spirit of Texas Bank, SSB, a Texas state savings bank and wholly-owned subsidiary of Spirit (“Spirit Bank”), with Spirit Bank continuing as the surviving bank, all regulatory approvals required to be obtained prior to the completion of the Merger have been obtained.

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.