15. Stock-Based Compensation

Covista’s current stock-based incentive plan is its Fourth Amended and Restated Incentive Plan of 2013, which is administered by the Compensation Committee of the Board. Under the plan, employees and Board members are eligible to receive stock options, restricted stock units (“RSUs”), performance-based restricted stock units (“PSUs”), and other forms of stock awards. As of June 30, 2026, 1,140,745 shares of common stock were available for future issuance under this plan.

Stock-based compensation expense is recognized on a straight-line basis over the requisite service period. We account for forfeitures of unvested awards in the period they occur. Covista issues new shares of common stock to satisfy stock option exercises, RSU vests, and PSU vests.

Stock-based compensation expense, which is included in student services and administrative expense, and the related income tax benefit were as follows (in thousands):

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There was no capitalized stock-based compensation cost as of each of June 30, 2026 and 2025.

Stock Options

Beginning in fiscal year 2023, the Compensation Committee of the Board determined to no longer grant stock options. Prior to fiscal year 2023, we granted stock options generally with a four-year graded vesting from the grant date that expire ten years from the grant date. The following table summarizes stock option activity for the year ended June 30, 2026:

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The fair value of stock options that vested during the years ended June 30, 2026, 2025, and 2024 was $0.6 million, $1.3 million, and $1.9 million, respectively. As of June 30, 2026, all outstanding stock options have vested and therefore there is no remaining unrecognized stock-based compensation expense related to unvested stock options. The total intrinsic value of stock options exercised for the years ended June 30, 2026, 2025, and 2024 was $0.4 million, $10.6 million, and $10.0 million, respectively. The tax benefit from options exercised for the years ended June 30, 2026, 2025, and 2024 was $0.1 million, $0.3 million, and $2.5 million, respectively.

RSUs

We grant RSUs generally with a three-year graded vesting from the grant date. We also grant RSUs to our Board members with a one-year cliff vest from the grant date. The fair value per share of RSUs is the closing market price of our common stock on the grant date. The following table summarizes RSU activity for the year ended June 30, 2026:

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The weighted-average grant date fair value per share of RSUs granted in the years ended June 30, 2026, 2025, and 2024 was $97.73, $89.65, and $44.24 respectively. The grant date fair value of RSUs that vested during the years ended June 30, 2026, 2025, and 2024 was $16.5 million, $15.9 million, and $13.0 million, respectively. As of June 30, 2026, $12.7

million of unrecognized stock-based compensation expense related to unvested RSUs is expected to be recognized over a remaining weighted-average period of 1.7 years.

PSUs

We grant PSUs with an approximate three-year cliff vest from the grant date. The fair value per share of PSUs is the closing market price of our common stock on the grant date. We estimate the number of shares that will vest under our PSU awards when recognizing stock-based compensation expense for each reporting period. The final number of shares that vest under our PSUs is based on metrics approved by the Compensation Committee of the Board. The following table summarizes PSU activity for the year ended June 30, 2026:

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The weighted-average grant date fair value per share of PSUs granted in the years ended June 30, 2026, 2025, and 2024 was $96.86, $89.74, and $50.02, respectively. The grant date fair value of PSUs that vested during the years ended June 30, 2026, 2025, and 2024 was $20.4 million, $2.8 million, and $4.1 million, respectively. As of June 30, 2026, $21.8 million of unrecognized stock-based compensation expense related to unvested PSUs is expected to be recognized over a remaining weighted-average period of 1.0 years.