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STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Common Stock | Additional Paid in Capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2021 |  | $ 692.5 | $ 0.2 |  | $ 1,078.9 | $ 93.0 | $ (475.9) | $ (3.7)
Beginning balance (shares) at Dec. 31, 2021 |  |  | 15,865,118 |  |  |  |  |
Net income (loss) |  | 8.1 |  |  |  | 8.1 |  |
Other comprehensive (loss) income, net of tax |  | 18.0 |  |  |  |  |  | 18.0
Common shares issued (including impacts from Long-Term Incentive programs) (shares) |  |  | 58,641 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued |  | (1.9) |  |  | (1.9) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) |  |  | (19,643) |  |  |  |  |
Cash dividends declared | [1] | (12.5) |  |  |  | (12.5) |  |
Amortization of unearned equity compensation |  | 4.0 |  |  | 4.0 |  |  |
Ending balance at Mar. 31, 2022 |  | 708.2 | $ 0.2 |  | 1,081.0 | 88.6 | (475.9) | 14.3
Ending balance (shares) at Mar. 31, 2022 |  |  | 15,904,116 |  |  |  |  |
Beginning balance at Dec. 31, 2021 |  | 692.5 | $ 0.2 |  | 1,078.9 | 93.0 | (475.9) | (3.7)
Beginning balance (shares) at Dec. 31, 2021 |  |  | 15,865,118 |  |  |  |  |
Net income (loss) |  | (5.7) |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  | (17.6) |  |  |  |  |  |
Ending balance at Jun. 30, 2022 |  | 650.0 | $ 0.2 |  | 1,084.8 | 62.2 | (475.9) | (21.3)
Ending balance (shares) at Jun. 30, 2022 |  |  | 15,922,062 |  |  |  |  |
Beginning balance at Mar. 31, 2022 |  | 708.2 | $ 0.2 |  | 1,081.0 | 88.6 | (475.9) | 14.3
Beginning balance (shares) at Mar. 31, 2022 |  |  | 15,904,116 |  |  |  |  |
Net income (loss) |  | (13.8) |  |  |  | (13.8) |  |
Other comprehensive (loss) income, net of tax |  | (35.6) |  |  |  |  |  | (35.6)
Common shares issued (including impacts from Long-Term Incentive programs) |  | 0.6 |  |  | 0.6 |  |  |
Common shares issued (including impacts from Long-Term Incentive programs) (shares) |  |  | 18,101 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) |  |  | (155) |  |  |  |  |
Cash dividends declared | [1] | (12.6) |  |  |  | (12.6) |  |
Amortization of unearned equity compensation |  | 3.2 |  |  | 3.2 |  |  |
Ending balance at Jun. 30, 2022 |  | 650.0 | $ 0.2 |  | 1,084.8 | 62.2 | (475.9) | (21.3)
Ending balance (shares) at Jun. 30, 2022 |  |  | 15,922,062 |  |  |  |  |
Beginning balance at Dec. 31, 2022 |  | $ 631.2 | $ 0.2 |  | 1,090.4 | 13.3 | (475.9) | 3.2
Beginning balance (shares) at Dec. 31, 2022 |  | 15,940,756 | 15,940,756 | [2] |  |  |  |
Net income (loss) |  | $ 15.9 |  |  |  | 15.9 |  |
Other comprehensive (loss) income, net of tax |  | (1.1) |  |  |  |  |  | (1.1)
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [2] |  | 49,128 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued |  | (1.3) |  |  | (1.3) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) | [2] |  | (15,848) |  |  |  |  |
Cash dividends declared | [3] | (12.5) |  |  |  | (12.5) |  |
Amortization of unearned equity compensation |  | 3.4 |  |  | 3.4 |  |  |
Ending balance at Mar. 31, 2023 |  | 635.6 | $ 0.2 |  | 1,092.5 | 16.7 | (475.9) | 2.1
Ending balance (shares) at Mar. 31, 2023 | [2] |  | 15,974,036 |  |  |  |  |
Beginning balance at Dec. 31, 2022 |  | $ 631.2 | $ 0.2 |  | 1,090.4 | 13.3 | (475.9) | 3.2
Beginning balance (shares) at Dec. 31, 2022 |  | 15,940,756 | 15,940,756 | [2] |  |  |  |
Net income (loss) |  | $ 34.2 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  | (8.4) |  |  |  |  |  |
Ending balance at Jun. 30, 2023 |  | $ 638.1 | $ 0.2 |  | 1,096.6 | 22.4 | (475.9) | (5.2)
Ending balance (shares) at Jun. 30, 2023 |  | 16,013,164 | 16,013,164 | [2] |  |  |  |
Beginning balance at Mar. 31, 2023 |  | $ 635.6 | $ 0.2 |  | 1,092.5 | 16.7 | (475.9) | 2.1
Beginning balance (shares) at Mar. 31, 2023 | [2] |  | 15,974,036 |  |  |  |  |
Net income (loss) |  | 18.3 |  |  |  | 18.3 |  |
Other comprehensive (loss) income, net of tax |  | (7.3) |  |  |  |  |  | (7.3)
Common shares issued (including impacts from Long-Term Incentive programs) |  | 0.7 |  |  | 0.7 |  |  |
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [2] |  | 45,164 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued |  | (0.4) |  |  | (0.4) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) | [2] |  | (6,036) |  |  |  |  |
Cash dividends declared | [3] | (12.6) |  |  |  | (12.6) |  |
Amortization of unearned equity compensation |  | 3.8 |  |  | 3.8 |  |  |
Ending balance at Jun. 30, 2023 |  | $ 638.1 | $ 0.2 |  | $ 1,096.6 | $ 22.4 | $ (475.9) | $ (5.2)
Ending balance (shares) at Jun. 30, 2023 |  | 16,013,164 | 16,013,164 | [2] |  |  |  |
[1] | Dividends declared per common share were $0.77 for the quarters ended March 31, 2022 and June 30, 2022.
[2] | At June 30, 2023, 498,710 shares were available for awards under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (“2021 Plan”)
[3] | Dividends declared per common share were $0.77 for the quarters ended March 31, 2023 and June 30, 2023.

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