FSUN

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date, issued to Castle Creek Advisors IX LLC, on behalf of Spencer Cohn in his capacity as a member of the Board of Directors of the Issuer.

Does not include 1,100,184 shares held by Castle Creek Capital Partners IX LP. Mr. Cohn, a principal of the general partner of Castle Creek Capital Partners IX LP, disclaims beneficial ownership of the shares held by Castle Creek Advisors IX LLC and Castle Creek Capital Partners IX LP, except to the extent of his pecuniary interest therein and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Annual restricted stock award for board service, which vests on the one-year anniversary of the grant date.

Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units, which were granted to the reporting person on April 1, 2023, under the company's Long- Term Incentive Plan and vested upon achievement of performance goals for the applicable three-year performance period.

Award of time-vesting restricted stock units that vest in three equal annual installments on the anniversary of the grant date.

232,348 of the shares reported are held in a joint brokerage account with spouse.

Shares withheld on vesting of restricted stock award to cover tax withholding.

The reporting person's original Form 4 filed on April 2, 2026 mistakenly reported a per-share market value of shares withheld to pay tax withholdings of $36.46, which was the market closing price on the day before the transaction date. However, the Issuer used the April 1, 2026 vesting date to determine shares withheld and the market closing price on April 1, 2026 was $36.71.

Received in exchange for 13,308 unvested restricted stock units ("RSUs") of First Foundation Inc. ("First Foundation") that were assumed by FirstSun Capital Bancorp ("FirstSun") and replaced with RSUs of FirstSun, in connection with the merger of First Foundation with and into FirstSun. Each unvested RSU of First Foundation was converted into an RSU of FirstSun with respect to FirstSun common stock, based on the exchange ratio in the merger of 0.16083 of a share of FirstSun common stock for each share of First Foundation common stock.

Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units, which were granted to the reporting person on April 1, 2023, under the company's Long- Term Incentive Plan and vested upon achievement of performance goals for the applicable three-year performance period.

Award of time-vesting restricted stock units that vest in three equal annual installments on the anniversary of the grant date.

Vested stock grant issued to director to satisfy bank regulatory ownership requirements.

Shares withheld on vesting of restricted stock unit awards to cover tax withholding.

Based on market closing price on the day before the transaction date.

Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units, which were granted to the reporting person on April 1, 2023, under the company's Long- Term Incentive Plan and vested upon achievement of performance goals for the applicable three-year performance period.

232,348 of the shares reported are held in a joint brokerage account with spouse.

Shares withheld on vesting of restricted stock unit awards to cover tax withholding.

Based on market closing price on the day before the transaction date.

Shares withheld on vesting of restricted stock unit awards to cover tax withholding.

Based on market closing price on the day before the transaction date.

232,348 of the shares reported are held in a joint brokerage account with spouse.

Received in exchange for 13,308 unvested restricted stock units ("RSUs") of First Foundation Inc. ("First Foundation") that were assumed by FirstSun Capital Bancorp ("FirstSun") and replaced with RSUs of FirstSun, in connection with the merger of First Foundation with and into FirstSun. Each unvested RSU of First Foundation was converted into an RSU of FirstSun with respect to FirstSun common stock, based on the exchange ratio in the merger of 0.16083 of a share of FirstSun common stock for each share of First Foundation common stock.

Award of time-vesting restricted stock units that vest in three equal annual installments on the anniversary of the grant date.

Vested stock grant issued to director to satisfy bank regulatory ownership requirements.

Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units, which were granted to the reporting person on April 1, 2023, under the company's Long- Term Incentive Plan and vested upon achievement of performance goals for the applicable three-year performance period.

Received in exchange for 500,000 unvested restricted stock units ("RSUs") of First Foundation Inc. ("First Foundation") that were assumed by FirstSun Capital Bancorp ("FirstSun") and replaced with RSUs of FirstSun, in connection with the merger of First Foundation with and into FirstSun. Each unvested RSU of First Foundation was converted into an RSU of FirstSun with respect to FirstSun common stock, based on the exchange ratio in the merger of 0.16083 of a share of FirstSun common stock for each share of First Foundation common stock.

Received in exchange for (a) 6,768,343 shares of First Foundation common stock and (b) 389.28296 shares of First Foundation Series C non-voting common equity equivalent stock (the "Series C stock"), each in connection with the merger. Each share of Series C stock converted into the right to receive a number of shares of FirstSun common stock equal to the number of shares of First Foundation common stock that such share was convertible into immediately prior to the effective time of the merger, multiplied by the exchange ratio of 0.16083. Each share of First Foundation common stock converted into the right to receive 0.16083 of a share of FirstSun common stock, with cash paid in lieu of fractional shares. On the last trading day before the effective date of the merger, the closing price of First Foundation common stock was $5.90 per share, and the closing price of FirstSun common stock was $36.46 per share.

Owned directly by Strategic Value Investors LP. The reporting person, solely by virtue of his position as a managing member of Strategic Value Bank Partners LLC, which serves as the general partner of Strategic Value Investors LP, may be deemed to beneficially own the shares owned by Strategic Value Investors LP for purposes of Section 16. The reporting person expressly disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

Award of time-vesting restricted stock units that vest in three equal annual installments on the anniversary of the grant date.

Received in exchange for 13,308 unvested restricted stock units ("RSUs") of First Foundation Inc. ("First Foundation") that were assumed by FirstSun Capital Bancorp ("FirstSun") and replaced with RSUs of FirstSun, in connection with the merger of First Foundation with and into FirstSun. Each unvested RSU of First Foundation was converted into an RSU of FirstSun with respect to FirstSun common stock, based on the exchange ratio in the merger of 0.16083 of a share of FirstSun common stock for each share of First Foundation common stock.

Shares withheld on vesting of restricted stock unit awards to cover tax withholding.

Based on market closing price on the day before the transaction date.

Vested stock grant issued to director to satisfy bank regulatory ownership requirements.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include (i) 3,395 shares of common stock held by an affiliate of the Reporting Person, JLL Partners Fund FCH LP, for which the Reporting Person has voting power, and (ii) 1,169 shares for director annual restricted stock awards granted on May 8, 2025 for FirstSun Capital Bancorp board service, which vest on May 8, 2026.

The shares reported include 1,753 shares of restricted stock awards granted 5/8/2025, which includes 1,169 shares of restricted common stock for FirstSun Capital Bancorp board service, and 584 shares of restricted common stock for Sunflower Bank board service, each award vests on 5/8/2026.