| Schedule of Changes in Common Stock Outstanding |
The following table summarizes our shares outstanding for the three years ended December 31, 2022:
| | | | | | | | | | | | | Class A Common Stock | | Class B Common Stock | | BALANCE, December 31, 2019 | 209,975,963 | | | 1 | | | Issuance of equity | 55,294 | | | — | | | Exercise of stock options | 3,160,065 | | | — | | | Restricted stock issuances, net of cancellations | 5,992 | | | — | | | Restricted stock unit vesting | 753,139 | | | — | | | Purchase of treasury stock | (20,219,461) | | | — | | | BALANCE, December 31, 2020 | 193,730,992 | | | 1 | | | Exercise of stock options | 1,568,488 | | | — | | | Restricted stock issuances, net of cancellations | 4,627 | | | — | | | Restricted stock unit vesting | 664,771 | | | — | | | Purchase of treasury stock | (23,227,642) | | | — | | | BALANCE, December 31, 2021 | 172,741,236 | | | 1 | | | Exercise of stock options | 552,442 | | | — | | | Restricted stock issuances, net of cancellations | 6,845 | | | — | | | Restricted stock unit vesting | 591,647 | | | — | | | Purchase of treasury stock | (21,240,774) | | | — | | | BALANCE, December 31, 2022 | 152,651,396 | | | 1 | |
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| Class of Treasury Stock |
The following represents the Company's purchase of Charter Class A common stock and the effect on the consolidated statements of cash flows during the years ended December 31, 2022, 2021 and 2020.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | 2022 | | 2021 | | 2020 | | Shares | | $ | | Shares | | $ | | Shares | | $ | | Share buybacks | 20,628,464 | | | $ | 10,095 | | | 22,015,125 | | | $ | 15,038 | | | 18,444,203 | | | $ | 10,639 | | | Income tax withholding | 310,391 | | | 182 | | | 586,008 | | | 393 | | | 1,022,783 | | | 578 | | | Exercise cost | 301,919 | | | | | 626,509 | | | | | 752,475 | | | | | 21,240,774 | | | $ | 10,277 | | | 23,227,642 | | | $ | 15,431 | | | 20,219,461 | | | $ | 11,217 | |
Share buybacks above include shares of Charter Class A common stock purchased from Liberty Broadband Corporation (“Liberty Broadband”) pursuant to the LBB Letter Agreement as follows (see Note 19). | | | | | | | | | | | | | Year Ended December 31, | | 2022 | | 2021 | | Number of shares purchased | 6,168,174 | | | 6,077,664 | | | Amount of shares purchased | $ | 3,034 | | | $ | 4,179 | |
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