X0306 5/A 2018-12-31 2017-10-10 0 0 1 0001676479 CapStar Financial Holdings, Inc. CSTR 0001685035 Frist Julie D. 1201 DEMONBREUN STREET, SUITE 700 NASHVILLE TN 37203 1 0 0 0 Common Stock 2017-10-05 4 X 0 2000 10.00 A 213821 D Common Stock 2017-10-05 4 S 0 2000 19.44 D 211821 D Option (right to buy) 10.00 2017-10-05 4 X 0 2000 0.00 D 2018-11-13 Common Stock 2000 4000 D These shares were inadvertently omitted from the reporting person's Form 4 filed on October 10, 2017, and also were inadvertently omitted from the Forms 4 filed by the reporting person after October 10, 2017. The reported item represents shares that were acquired pursuant to the exercise of options on October 5, 2017 and that were subsequently sold on October 5, 2017 pursuant to a Rule 10b5-1 trading plan. The shares were sold in multiple transactions at prices ranging from $19.07 to $19.55. The reporting person hereby undertakes to provide upon request to the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the sales were effected. Following these reported transactions, the reporting person directly owned 211,821 shares of common stock. These options vested in four equal annual installments beginning one year after the November 13, 2008 grant date. /s/ Rob Anderson, as Attorney-in-Fact for Julie D. Frist 2019-02-14