WABC · Westamerica Bancorporation

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Of the 2,040 Restricted Performance Shares that vested January 2026, 1,010 shares were withheld to pay the tax liability.

Includes shares from dividend reinvestment.

Of the 2,806 Restricted Performance Shares that vested January 2026, 1,156 shares were withheld to pay the tax liability.

Of the1,360 Restricted Performance Shares that vested January 2026, 601 shares were withheld to pay the tax liability.

Includes shares from dividend reinvestment.

Prorated vesting. 91.7% of the Restricted Performance Shares granted in 2023 have vested upon meeting performance criteria.

Options vest ratably over three years beginning one year from date of grant

Options vest ratably over three years beginning one year from date of grant

Includes shares from dividend reinvestment.

Prorated vesting. 25% of the Restricted Performance Shares granted in 2025 have vested upon meeting performance criteria.

Options vest ratably over three years beginning one year from date of grant

Options vest ratably over three years beginning one year from date of grant

Includes shares from dividend reinvestment.

Prorated vesting. 58.3% of the Restricted Performance Shares granted in 2024 have vested upon meeting performance criteria.

The Restricted Performance Shares granted in 2023 have vested upon meeting performance criteria.

Vested Restricted Performance Shares were incorrectly transferred from Common Stock (D) to Common Stock (I) owned by Trust and inadvertently included in the balance of indirectly owned by Trust.

The Restricted Performance Shares granted in 2023 have vested upon meeting performance criteria.

Options vest ratably over three years beginning one year from date of grant

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Of the 1,430 Restricted Performance Shares that vested January 2025, 588 shares were withheld to pay the tax liability.

Of the 1,270 Restricted Performance Shares that vested January 2025, 560 shares were withheld to pay the tax liability.

Of the 1,900 Restricted Performance Shares that vested January 2025, 998 shares were withheld to pay the tax liability.

Of the 4,594 Restricted Performance Shares that vested January 2025, 1,999 shares were withheld to pay the tax liability.

Includes shares from dividend reinvestment.

The Restricted Performance Shares granted in 2022 have vested upon meeting performance criteria.

Options vest ratably over three years beginning one year from date of grant.

The Restricted Performance Shares granted in 2022 have vested upon meeting performance criteria.

This Form 4 is amended to correct the number of shares beneficially owned following the reported transaction.

Options vest ratably over three years beginning one year from date of grant.

The Restricted Performance Shares granted in 2022 have vested upon meeting performance criteria.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.

Prorated vesting. 1/3 of the Restricted Performance Shares granted in 2024 have vested upon meeting performance criteria.

Prorated vesting. 2/3 of the Restricted Performance Shares granted in 2023 have vested upon meeting performance criteria.

The Restricted Performance Shares granted in 2022 have vested upon meeting performance criteria.

Options vest ratably over three years beginning one year from date of grant.

Options vest ratably over three years beginning one year from date of grant.