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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company grants stock-based compensation awards as an incentive for employees and directors to contribute to the Company’s long-term success. The Company currently awards stock-settled stock appreciation rights, service-based and performance-based restricted stock units, and common stock equivalents. As of September 30, 2025, the Company had 5.2 million shares of its common stock, par value $0.0005 per share, (the “Common Stock”) available for stock-based compensation awards under the Gartner, Inc. Long-Term Incentive Plan as amended and restated in June 2023 (the “Plan”). The tables below summarize the Company’s stock-based compensation expense by award type and expense category line item during the periods indicated (in millions).
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
Award type |  | 2025 |  | 2024 |  | 2025 |  | 2024
Stock appreciation rights |  | $ | 2.8 |  |  | $ | 3.0 |  |  | $ | 10.2 |  |  | $ | 10.6 |
Restricted stock units |  | 27.5 |  |  | 31.2 |  |  | 112.8 |  |  | 113.2 |
Common stock equivalents |  | 0.2 |  |  | 0.2 |  |  | 0.7 |  |  | 0.8 |
Total (1) |  | $ | 30.5 |  |  | $ | 34.4 |  |  | $ | 123.7 |  |  | $ | 124.6 |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
Expense category line item |  | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of services and product development |  | $ | 11.5 |  |  | $ | 13.8 |  |  | $ | 49.0 |  |  | $ | 48.6 |
Selling, general and administrative |  | 19.0 |  |  | 20.6 |  |  | 74.7 |  |  | 76.0 |
Total (1) |  | $ | 30.5 |  |  | $ | 34.4 |  |  | $ | 123.7 |  |  | $ | 124.6 |
(1)Includes costs of $11.0 million and $12.9 million during the three months ended September 30, 2025 and 2024, respectively, and $58.0 million and $61.9 million during the nine months ended September 30, 2025 and 2024, respectively, for awards to retirement-eligible employees. Those awards are expensed on an accelerated basis.

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