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STOCK-BASED COMPENSATION
6 Months Ended
Jun. 30, 2026
STOCK-BASED COMPENSATION  
STOCK-BASED COMPENSATION

NOTE 11.    STOCK-BASED COMPENSATION

The Compensation Committee of our Board administers our stock plans. As of June 30, 2026, we have two active stock-based incentive compensation plans: the Amended and Restated 2023 Omnibus Incentive Plan (the “2023 Incentive Plan”) under which we issue all new equity compensation grants and the Employee Stock Purchase Plan (“ESPP”). Outstanding awards previously issued under inactive plans will continue to vest and remain exercisable in accordance with the terms of the respective plans. We do not have material outstanding stock option awards.

The 2023 Incentive Plan provides for the grant of awards including stock options, stock appreciation rights, performance stock units, performance units, stock, restricted stock, restricted stock units, and cash incentive awards.

The following table summarizes information related to our stock-based incentive compensation plans:

June 30, 2026

(in millions)

Shares available for future issuance under the 2023 Incentive Plan

3.7

Shares available for future issuance under the ESPP

0.5

Stock-Based Compensation Expense

We recognize stock-based compensation expense based on the fair value of the awards issued and the functional area of the employee receiving the award. During the three and six months ended June 30, 2026, stock-based compensation expense included $0.9 million and $1.8 million, respectively, related to the acquisition of Airity Technologies, Inc. in June 2024. Stock-based compensation was as follows:

Three Months Ended June 30, 

Six Months Ended June 30, 

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

(in millions)

Stock-based compensation expense

$

21.4

$

13.6

$

39.5

$

26.6

Restricted Stock Units

Generally, we grant restricted stock units (“RSUs”) with a three-year time-based vesting schedule. Certain RSUs contain performance-based or market-based vesting conditions in addition to the time-based vesting requirements. RSUs are generally granted with a grant date fair value based on the market price of our stock on the date of grant. For RSUs that vest based on our relative total shareholder return over the performance period to a predetermined peer group, fair value is predetermined based on a Monte Carlo simulation as of the date of the grant.

Changes in our RSUs were as follows:

Six Months Ended June 30, 2026

  ​ ​ ​

  ​ ​ ​

Weighted-

Average

Number of

Grant Date

RSUs

Fair Value

(in millions)

RSUs outstanding at beginning of period

 

1.0

$

111.72

RSUs granted

 

0.3

$

304.03

RSUs vested

 

(0.4)

$

106.10

RSUs forfeited

 

(0.1)

$

136.39

RSUs outstanding at end of period

 

0.8

$

181.45

RSUs that vested during the period were higher than RSUs granted due to performance of our stock price due primarily to settlement of market-based awards whose payout exceeded target levels.

Deferred Compensation Plan

We offer certain employees the opportunity to defer compensation and stock awards and maintain a rabbi trust in connection with this deferred compensation plan. Assets of the rabbi trust are consolidated as we are the primary beneficiary. Although we cannot use the rabbi trust’s assets for any purpose other than meeting our obligations under the deferred compensation plan, the trust’s assets, liabilities, and activity are included in our consolidated financial statements.

Assets of the rabbi trust not held in Company shares are presented in other assets, and any gains or losses are included in other expense, net. The fair value of the Company shares held in the rabbi trust is classified in stockholders’ equity.

After a holding period, employees have the option to diversify the Company shares into other funds. Stock awards that have been elected for deferral but have not yet vested and are probable of vesting are reported as deferred compensation in the temporary equity section of the Consolidated Balance Sheets. The stock awards recorded in temporary equity are recognized at fair value, with any difference from stock-based compensation recorded in retained earnings.

The following table summarizes information regarding the rabbi trust’s assets and liabilities:

June 30,

December 31,

2026

2025

Description

Balance Sheet Classification

(in millions)

Investments

Other assets

$

19.8

$

13.5

Deferred compensation liabilities

Other liabilities

$

19.4

$

13.4

Stock awards elected for deferral

Temporary equity

$

21.0

$

7.8

Company shares of common stock

Stockholders' equity

$

14.4

$

2.6