On March 31, 2015, we adopted the 2015 Equity Incentive Plan (the 2015 Plan). On January 1, 2022, an additional 6,689 shares of our Class A common stock were reserved for issuance under the automatic increase provisions of the 2015 Plan, and as of December 31, 2022, 34,242 shares were available for issuance as future awards under the plan.

On March 31, 2015, we adopted the 2015 Employee Stock Purchase Plan (the ESPP). On January 1, 2022, an additional 1,000 shares of our Class A common stock were reserved for issuance under the automatic increase provisions of the ESPP, and as of December 31, 2022, 5,097 shares were available for issuance under the plan.

The following table summarizes stock option activity:


	Number of Shares of Class A Common Stock (#)	Weighted- Average Grant- Date Fair Value ($)	Weighted- Average Exercise Price ($)	Weighted- Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value ($)








Outstanding at December 31, 2019	6,304		38.08
Granted	154	22.33	68.05
Exercised	(2,613)		29.71		121.0
Forfeited	(417)		62.82
Outstanding at December 31, 2020	3,428		42.79

Exercised	(1,168)		36.72		51.0
Forfeited	(261)		68.77
Outstanding at December 31, 2021	1,999		42.94

Exercised	(536)		37.04		22.9
Forfeited	(37)		72.94
Outstanding at December 31, 2022	1,426		44.38	4.4	43.5
Vested at December 31, 2022	1,347		43.05	4.2	42.9

The following table summarizes stock award activity:


						Number of Shares of Class A Common Stock (#)
Outstanding at December 31, 2019(1)						5,240
Granted: RSUs						3,743
Granted: Financial-based PSUs						414
Vested						(2,368)
Forfeited						(896)
Outstanding at December 31, 2020(1)						6,133
Granted: RSUs						4,332
Granted: TSR-based PSUs						426
Vested						(2,645)
Forfeited						(1,480)
Outstanding at December 31, 2021(1)						6,766
Granted: RSUs						4,369
Granted: TSR-based PSUs						246
Vested						(2,734)
Forfeited						(1,015)
Outstanding at December 31, 2022(1)						7,632

(1)Includes financial-based PSUs for which performance targets have not yet been established, and which are not yet considered granted for accounting purposes. The balance of outstanding awards is comprised of the following:


	Number of Shares of Class A Common Stock (#)	Weighted Average Fair Value Per Share ($)





RSUs	5,356	70.54
TSR-based PSUs	349	106.14
Financial-based PSUs granted for accounting purposes	223	66.97
Financial-based PSUs not yet granted for accounting purposes	205	n/a
Outstanding at December 31, 2020	6,133

RSUs	6,058	77.37
TSR-based PSUs	558	107.05
Financial-based PSUs granted for accounting purposes	75	78.62
Financial-based PSUs not yet granted for accounting purposes	75	n/a
Outstanding at December 31, 2021	6,766

RSUs	6,890	80.32
TSR-based PSUs	676	121.00
Financial-based PSUs granted for accounting purposes	41	82.52
Financial-based PSUs not yet granted for accounting purposes	25	n/a
Outstanding at December 31, 2022	7,632

As of December 31, 2022, total unrecognized compensation expense related to non-vested equity grants was $406.9 million with an expected remaining weighted-average recognition period of approximately 2.4 years. Such amounts exclude PSUs not yet considered granted for accounting purposes.