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STOCK-BASED COMPENSATION
 6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
The Company maintains employee stock-based compensation plans for stock options, restricted stock, and incentive stock units as governed by the 2011 Stock Incentive Compensation Plan, as amended and restated (the “2011 Plan”) and the 2000 Stock Incentive Plan, as amended (the “2000 Plan”). The 2011 Plan has a term through May 10, 2027, and as of June 30, 2023, the number of shares available for future grants under the 2011 Plan was approximately 4.9 million shares. The Company also maintains a 1995 Non-Employee Directors’ Fee and Stock Option Plan as amended and restated (“the Directors Plan”).
Stock-based compensation expense was $14 million and $26 million for the three and six months ended June 30, 2023, respectively, and $12 million and $23 million for the three and six months ended June 30, 2022, respectively. At June 30, 2023, unamortized compensation expense related to stock options, non-vested restricted shares and incentive stock units expected to vest is approximately $80 million.
Stock Options Stock options are granted to eligible employees and directors at an exercise price equal to fair market value, which is the average of the high and low Wabtec stock price on the date of grant. Under the 2011 Plan and the 2000 Plan, options become exercisable over a three-year vesting period and expire 10 years from the date of grant. No stock options were granted during the six months ended June 30, 2023 or the twelve months ended December 31, 2022.
The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan for the six months ended June 30, 2023:
OptionsWeighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual Life		Aggregate
Intrinsic value
(in millions)
Outstanding at December 31, 2022399,938 $77.32 5.9$11 
Exercised(32,498)$72.87 
Canceled(1,319)$78.94 
Outstanding at June 30, 2023366,121 $77.71 5.5$12 
Exercisable at June 30, 2023330,639 $77.50 5.5$11 

Restricted Stock, Restricted Stock Units and Incentive Stock As provided for under the 2011 Plan and 2000 Plan, eligible employees are granted restricted stock that generally vests over three years from the date of grant. Under the Directors Plan, restricted stock awards vest one year from the date of grant. The restricted stock units are liability-classified equity awards as they can be settled in cash.
In addition, the Company has issued incentive stock units to eligible employees that vest upon attainment of certain cumulative three-year performance goals. Significant judgments and estimates are used in determining the estimated three-year performance, which is then used to estimate the total shares expected to vest over the three year vesting cycle and corresponding expense based on the grant date fair value of the award. When determining the estimated three-year performance, the Company utilizes a combination of historical actual results, budgeted results and forecasts. Upon the initial grant of a performance cycle, the Company estimates the three-year performance at 100%. Quarterly, the Company reviews and updates performance estimates based on actual performance results and current projections. Based on the Company’s performance for each three-year period then ended, the incentive stock units can vest and be awarded ranging from 0% to 200% of the initial incentive stock units granted. The incentive stock units included in the table below represent the number of incentive stock units that are expected to vest based on the Company’s estimate for meeting those established performance targets. As of June 30, 2023, the Company estimates that it will achieve 125%, 122% and 101% for the incentive stock awards expected to vest based on performance for the three-year periods ending December 31, 2023, 2024, and 2025, respectively, and has recorded incentive compensation expense accordingly. If the estimates of the number of these incentive stock units expected to vest changes in a future accounting period, cumulative compensation expense could increase or decrease and will be recognized in the current period for the elapsed portion of the vesting period and would change future expense for the remaining vesting period.
Compensation expense for the non-vested restricted stock and incentive stock units is based on the closing price of the Company's common stock on the date of grant and recognized over the applicable vesting period. Expense for incentive stock units is updated as necessary based on the Company's performance.
The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan, and Directors Plan, and incentive stock units activity and related information for the 2011 Plan and the 2000 Plan with related information for the six months ended June 30, 2023:
Restricted
Stock
and Units		Incentive
Stock
Units		Weighted
Average Grant
Date Fair
Value
Outstanding at December 31, 2022689,420 744,844 $84.73 
Granted352,584 192,751 $104.51 
Vested(228,203)(265,678)$81.40 
Adjustment for incentive stock awards expected to vest— (842)$85.98 
Canceled(12,198)(1,938)$89.08 
Outstanding at June 30, 2023801,603 669,137 $93.13