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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation
16.Stock–Based Compensation
The Company has regularly granted equity awards in the form of stock options, restricted stock, restricted stock units and other stock-based awards under its stockholder-approved Amended and Restated 2019 Equity and Incentive Plan to certain employees and directors.
The Company began granting market share units (“MSUs”) to employees in lieu of stock options during 2024. MSUs are market-based equity awards that represent a right to receive shares of the Company’s common stock at specified future dates if certain WEX stock price performance and vesting conditions are met. The number of MSUs that will be eligible to vest will be based on the performance of our stock price over the vesting period. The fair value of the MSUs was estimated using a Monte-Carlo valuation model and will be recognized as expense over each award’s requisite service period.
Stock-based compensation expense was $33.4 million and $61.5 million for the three and six months ended June 30, 2024, respectively, and $35.9 million and $61.2 million for the three and six months ended June 30, 2023, respectively.