Washington, D.C. 20549


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB Number: 3235-0104
Estimated average burden
hours per response: 0.5
1. Name and Address of Reporting Person*
Long Justin M

(Last) (First) (Middle)


(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
3. Issuer Name and Ticker or Trading Symbol
CBTX, Inc. [ CBTX ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Sr. EVP Gen Counsel
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
No securities are beneficially owned.
/s/Robert T. Pigott, Jr., attorney-in-fact 04/30/2019
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
Power of Attorney

Know all by these presents, that the undersigned hereby
constitutes and appoints each of Robert R. Franklin, Jr. and
Robert T. Pigott, Jr., signing singly, the undersigned's true and
lawful attorney-in-fact to:

(1) prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S. Securities and
Exchange Commission (the "SEC") a Form ID, including amendments
thereto, and any other documents necessary or appropriate to
obtain codes and passwords enabling the undersigned to make
electronic filings with the SEC of reports required by
Section 16(a) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and the rules and regulations thereunder;

(2) execute for and on behalf of the undersigned Forms 3, 4 and 5
(including amendments thereto) in accordance with
Section 16(a) of the Exchange, and the rules and regulations

(3)  do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to complete and
execute any such Form 3, 4 or 5, complete and execute any
amendment or amendments thereto, file that Form with the SEC and
any stock exchange or similar authority, and provide a copy as
required by law or advisable to such persons as the attorney-in-
fact deems appropriate; and

(4) take any other action of any type whatsoever in connection
with the foregoing that, in the opinion of the attorney-in-fact,
may be of benefit to, in the best interest of, or legally
required of the undersigned, it being understood that the
documents executed by the attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney will be in such
form and will contain such terms and conditions as the attorney-
in-fact may approve in the attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the
exercise of any of the rights and powers herein granted, as fully
to all intents and purposes as the undersigned might or could do
if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that the
attorney-in-fact, or the attorney-in-fact's substitute or
substitutes, will lawfully do or cause to be done by virtue of
this Power of Attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing
attorneys-in-fact, and their substitutes, in serving in such
capacity at the request of the undersigned, are not assuming, nor
is CBTX, Inc., any of the undersigned's responsibilities to
comply with Section 16 of the Exchange Act.

The undersigned agrees that each such attorney-in-fact may rely
entirely on information furnished orally or in writing by or at
the direction of the undersigned to the attorney-in-fact.  The
undersigned also agrees to indemnify and hold harmless CBTX, Inc.
and each such attorney-in-fact against any losses, claims,
damages or liabilities (or actions in these respects) that arise
out of or are based upon any untrue statements or omissions of
necessary facts in the information provided by or at the
direction of the undersigned, or upon the lack of timeliness in
the delivery of information by or at the direction of the
undersigned, to that attorney-in-fact for purposes of executing,
acknowledging, delivering or filing any Form 3, 4 or 5 (including
any amendment thereto) and agrees to reimburse CBTX, Inc. and the
attorney-in-fact on demand for any legal or other expenses
reasonably incurred in connection with investigating or defending
against any such loss, claim, damage, liability or action.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4
and 5 with respect to the undersigned's holdings of and
transactions in securities issued by CBTX, Inc., unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of the date written below.

By:  /s/ Justin M. Long
Name: Justin M. Long
Date: 04/30/19