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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, 2022 |  | $ 631.2 | $ 0.2 |  | $ 1,090.4 | $ 13.3 | $ (475.9) | $ 3.2
Beginning balance (shares) at Dec. 31, 2022 |  |  | 15,940,756 |  |  |  |  |
Net income |  | 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) |  |  | 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) |  |  | (15,848) |  |  |  |  |
Cash dividends declared | [1] | (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 |  |  | 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 |  |  |  |  |
Net income |  | 39.6 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  | (2.4) |  |  |  |  |  |
Ending balance at Sep. 30, 2023 |  | 640.7 | $ 0.2 |  | 1,100.4 | 15.2 | (475.9) | 0.8
Ending balance (shares) at Sep. 30, 2023 |  |  | 16,013,818 |  |  |  |  |
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 |  |  | 15,974,036 |  |  |  |  |
Net income |  | 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) |  |  | 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) |  |  | (6,036) |  |  |  |  |
Cash dividends declared | [1] | (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 |  |  |  |  |
Net income |  | 5.4 |  |  |  | 5.4 |  |
Other comprehensive (loss) income, net of tax |  | 6.0 |  |  |  |  |  | 6.0
Common shares issued (including impacts from Long-Term Incentive programs) (shares) |  |  | 1,000 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued |  | (0.1) |  |  | (0.1) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) |  |  | (346) |  |  |  |  |
Cash dividends declared | [1] | (12.6) |  |  |  | (12.6) |  |
Amortization of unearned equity compensation |  | 3.9 |  |  | 3.9 |  |  |
Ending balance at Sep. 30, 2023 |  | 640.7 | $ 0.2 |  | 1,100.4 | 15.2 | (475.9) | 0.8
Ending balance (shares) at Sep. 30, 2023 |  |  | 16,013,818 |  |  |  |  |
Beginning balance at Dec. 31, 2023 |  | $ 652.2 | $ 0.2 |  | 1,104.7 | 10.1 | (475.9) | 13.1
Beginning balance (shares) at Dec. 31, 2023 |  | 16,015,791 | 16,015,791 | [2] |  |  |  |
Net income |  | $ 24.6 |  |  |  | 24.6 |  |
Other comprehensive (loss) income, net of tax |  | (2.1) |  |  |  |  |  | (2.1)
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [2] |  | 56,416 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued |  | (1.2) |  |  | (1.2) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) | [2] |  | (16,175) |  |  |  |  |
Cash dividends declared | [3] | (12.6) |  |  |  | (12.6) |  |
Amortization of unearned equity compensation |  | 4.0 |  |  | 4.0 |  |  |
Ending balance at Mar. 31, 2024 |  | 664.9 | $ 0.2 |  | 1,107.5 | 22.1 | (475.9) | 11.0
Ending balance (shares) at Mar. 31, 2024 | [2] |  | 16,056,032 |  |  |  |  |
Beginning balance at Dec. 31, 2023 |  | $ 652.2 | $ 0.2 |  | 1,104.7 | 10.1 | (475.9) | 13.1
Beginning balance (shares) at Dec. 31, 2023 |  | 16,015,791 | 16,015,791 | [2] |  |  |  |
Net income |  | $ 39.7 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax |  | 3.2 |  |  |  |  |  |
Ending balance at Sep. 30, 2024 |  | $ 667.0 | $ 0.2 |  | 1,114.6 | 11.8 | (475.9) | 16.3
Ending balance (shares) at Sep. 30, 2024 |  | 16,087,755 | 16,087,755 | [2] |  |  |  |
Beginning balance at Mar. 31, 2024 |  | $ 664.9 | $ 0.2 |  | 1,107.5 | 22.1 | (475.9) | 11.0
Beginning balance (shares) at Mar. 31, 2024 | [2] |  | 16,056,032 |  |  |  |  |
Net income |  | 3.1 |  |  |  | 3.1 |  |
Other comprehensive (loss) income, net of tax |  | 3.2 |  |  |  |  |  | 3.2
Common shares issued (including impacts from Long-Term Incentive programs) |  | 0.5 |  |  | 0.5 |  |  |
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [2] |  | 38,143 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued |  | (0.6) |  |  | (0.6) |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) | [2] |  | (7,063) |  |  |  |  |
Cash dividends declared | [3] | (12.7) |  |  |  | (12.7) |  |
Amortization of unearned equity compensation |  | 3.6 |  |  | 3.6 |  |  |
Ending balance at Jun. 30, 2024 |  | 662.0 | $ 0.2 |  | 1,111.0 | 12.5 | (475.9) | 14.2
Ending balance (shares) at Jun. 30, 2024 | [2] |  | 16,087,112 |  |  |  |  |
Net income |  | 12.0 |  |  |  | 12.0 |  |
Other comprehensive (loss) income, net of tax |  | 2.1 |  |  |  |  |  | 2.1
Common shares issued (including impacts from Long-Term Incentive programs) |  | 0.1 |  |  | 0.1 |  |  |
Common shares issued (including impacts from Long-Term Incentive programs) (shares) | [2] |  | 1,000 |  |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares) | [2] |  | (357) |  |  |  |  |
Cash dividends declared | [3] | (12.7) |  |  |  | (12.7) |  |
Amortization of unearned equity compensation |  | 3.5 |  |  | 3.5 |  |  |
Ending balance at Sep. 30, 2024 |  | $ 667.0 | $ 0.2 |  | $ 1,114.6 | $ 11.8 | $ (475.9) | $ 16.3
Ending balance (shares) at Sep. 30, 2024 |  | 16,087,755 | 16,087,755 | [2] |  |  |  |
[1] | Dividends declared per common share were $0.77 for each of the quarters ended March 31, 2023, June 30, 2023, and September 30, 2023.
[2] | At September 30, 2024, 597,415 shares were available for awards under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated
[3] | Dividends declared per common share were $0.77 for each of the quarters ended March 31, 2024, June 30, 2024, and September 30, 2024.

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