#1 Pursuant to terms of reporting person's restricted stock unit award agreement, withholding by Issuer of shares otherwise deliverable in respect of vesting on transaction date of 198 performance-vesting restricted stock units held by reporting person, in order to satisfy resulting tax withholding obligations. 1,252 performance-vesting restricted stock units under this award previously reported by reporting person at maximum performance did not vest and were forfeited.

#2 Pursuant to terms of reporting person's restricted stock unit award agreement, withholding by Issuer of shares otherwise deliverable in respect of vesting on transaction date of 121 performance-vesting restricted stock units held by reporting person, in order to satisfy resulting tax withholding obligations. 765 performance-vesting restricted stock units under this award previously reported by reporting person at maximum performance did not vest and were forfeited.

#3 Following the transactions reported on this Form 4, reporting person held (a) 14,201 shares of Issuer's common stock, (b) 34,898 restricted stock units, each representing the right to receive one share of the Company's common stock, and (c) 2,322 performance-vesting restricted stock units, each representing the right to receive one share of Issuer's common stock (assumes, as previously disclosed, target performance for performance-vesting restricted stock unit grants; actual number of aggregate shares earned will depend on actual performance and will range from 0 to 2,469 shares of Issuer's common stock, which includes adjustments to reflect performance for periods for which such measurement is already completed).

#1 Pursuant to terms of reporting person's restricted stock unit award agreement, withholding by Issuer of shares otherwise deliverable in respect of vesting on transaction date of 198 performance-vesting restricted stock units held by reporting person, in order to satisfy resulting tax withholding obligations. 1,252 performance-vesting restricted stock units under this award previously reported by reporting person at maximum performance did not vest and were forfeited.

#2 Pursuant to terms of reporting person's restricted stock unit award agreement, withholding by Issuer of shares otherwise deliverable in respect of vesting on transaction date of 121 performance-vesting restricted stock units held by reporting person, in order to satisfy resulting tax withholding obligations. 765 performance-vesting restricted stock units under this award previously reported by reporting person at maximum performance did not vest and were forfeited.

#3 Following the transactions reported on this Form 4, reporting person held (a) 14,201 shares of Issuer's common stock, (b) 34,898 restricted stock units, each representing the right to receive one share of the Company's common stock, and (c) 2,322 performance-vesting restricted stock units, each representing the right to receive one share of Issuer's common stock (assumes, as previously disclosed, target performance for performance-vesting restricted stock unit grants; actual number of aggregate shares earned will depend on actual performance and will range from 0 to 2,469 shares of Issuer's common stock, which includes adjustments to reflect performance for periods for which such measurement is already completed).

#1 On December 15, 2022, 1,009 restricted stock units held by Mr. Yang vested. Pursuant to the terms of his restricted stock unit award agreement, the Company withheld 349 of the shares otherwise deliverable to him in order to satisfy the resulting tax withholding obligations.

#2 On December 15, 2022, 12,415 restricted stock units held by Mr. Yang vested. Pursuant to the terms of his restricted stock unit award agreement, the Company withheld 5,914 of the shares otherwise deliverable to him in order to satisfy the resulting tax withholding obligations.

#3 On December 15, 2022, 141 restricted stock units held by Mr. Yang vested. Pursuant to the terms of his restricted stock unit award agreement, the Company withheld 70 of the shares otherwise deliverable to him in order to satisfy the resulting tax withholding obligations.

#4 Following the transactions reported on this Form 4, Mr. Yang held (a) 8,416 shares of the Company's common stock, (b) 39,304 restricted stock units, each representing the right to receive one share of the Company's common stock, and (c) 11,231 performance-vesting restricted stock units, each representing the right to receive one share of the Company's common stock. The actual number of aggregate shares earned in connection with the performance-vesting restricted stock units will depend on actual performance and will range from 0 to 11,723 shares of the Company's common stock. The number of performance-vesting restricted stock units assumes, as previously disclosed, maximum performance for grants prior to December 9, 2020, and assumes target performance for any awards thereafter.

#1 On December 15, 2022, 1,009 restricted stock units held by Mr. Yang vested. Pursuant to the terms of his restricted stock unit award agreement, the Company withheld 349 of the shares otherwise deliverable to him in order to satisfy the resulting tax withholding obligations.

#2 On December 15, 2022, 12,415 restricted stock units held by Mr. Yang vested. Pursuant to the terms of his restricted stock unit award agreement, the Company withheld 5,914 of the shares otherwise deliverable to him in order to satisfy the resulting tax withholding obligations.

#3 On December 15, 2022, 141 restricted stock units held by Mr. Yang vested. Pursuant to the terms of his restricted stock unit award agreement, the Company withheld 70 of the shares otherwise deliverable to him in order to satisfy the resulting tax withholding obligations.

#4 Following the transactions reported on this Form 4, Mr. Yang held (a) 8,416 shares of the Company's common stock, (b) 39,304 restricted stock units, each representing the right to receive one share of the Company's common stock, and (c) 11,231 performance-vesting restricted stock units, each representing the right to receive one share of the Company's common stock. The actual number of aggregate shares earned in connection with the performance-vesting restricted stock units will depend on actual performance and will range from 0 to 11,723 shares of the Company's common stock. The number of performance-vesting restricted stock units assumes, as previously disclosed, maximum performance for grants prior to December 9, 2020, and assumes target performance for any awards thereafter.