Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

A summary of stock option activity during the year ended December 31, 2023 is presented below:


	Number of Shares	Weighted-Average Exercise Price		Aggregate Grant Date Fair Value (in millions)
Outstanding at January 1, 2023	7,373,678	$	1.96	$	7
Issued	—	$	—	—
Exercised	(4,322,711)	$	0.29	—
Forfeited	(28,500)	$	10.93	—
Outstanding at December 31, 2023	3,022,467	$	4.27	$	7
Exercisable at December 31, 2023	3,022,467	$	4.27	$	7

A summary of RSU activity during the years ended December 31, 2023, 2022 and 2021 is presented below:


	2023			2022			2021
	Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value		Number of Shares	Weighted-Average Grant Date Fair Value
Outstanding at January 1	2,395,509	$	12.24	1,970,294	$	12.47	2,020,650	$	10.54
Issued	6,176,938	$	5.88	1,344,532	$	11.96	899,800	$	14.70
Vested	(800,189)	$	11.55	(533,065)	$	12.48	(543,879)	$	10.23
Forfeited	(549,950)	$	12.17	(73,711)	$	11.98	(205,542)	$	10.62
Repurchased (a)	(443,720)	$	12.21	(312,541)	$	12.14	(200,735)	$	11.00
Outstanding at December 31	6,778,588	$	6.53	2,395,509	$	12.24	1,970,294	$	12.47

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(a) Represents withholdings to cover tax obligations on vested shares when applicable.