Exhibit 99.4

CONSENT OF J.P. MORGAN SECURITIES LLC

We hereby consent to (i) the use of our opinion letter dated January 21, 2020 to the Board of Directors of FB Financial Corporation (the “Company”) included in Annex B to the Joint Proxy Statement/Prospectus relating to the proposed merger of the Company and Franklin Financial Network, Inc., and (ii) the references to such opinion in such Joint Proxy Statement/Prospectus. In giving such consent, we do not admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Securities and Exchange Commission thereunder, nor do we hereby admit that we are experts with respect to any part of such Registration Statement within the meaning of the term "experts" as used in the Securities Act of 1933, as amended, or the rules and regulations of the Securities and Exchange Commission thereunder.

Very truly yours,

/s/ J.P. Morgan Securities LLC

J.P. MORGAN SECURITIES LLC

April 29, 2020