| Stock-Based Compensation |
Stock-Based Compensation A summary of stock-based compensation expense recognized in the condensed consolidated statements of operations and comprehensive income is as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2026 | | 2025 | | 2026 | | 2025 | | Cost of revenue | $ | 890 | | | $ | 379 | | | $ | 3,081 | | | $ | 694 | | | Research and development | 49,395 | | | 21,711 | | | 115,212 | | | 58,749 | | | Sales and marketing | 19,678 | | | 9,361 | | | 40,989 | | | 30,874 | | | General and administrative | 12,627 | | | 9,288 | | | 36,213 | | | 28,342 | | Total(1) | $ | 82,590 | | | $ | 40,739 | | | $ | 195,495 | | | $ | 118,659 | | (1) Stock-based compensation expense for the nine months ended September 30, 2026 did not include the $4.0 million in share-based consideration related to acquisitions, see Note 6 - Business Combinations for further details.Stock Options A summary of stock option activity under the 2018 Plan and 2024 Plan is as follows (in thousands, except years and per share data): | | | | | | | | | | | | | | | | | | | | | | | | | Number of Shares | | Weighted Average Exercise Price | | Weighted Average Remaining Contractual Term (in years) | | Aggregate Intrinsic Value | | Outstanding as of December 31, 2025 | 2,721 | | $ | 0.86 | | | 5.5 | | $ | 450,336 | | | | | | | | | | | Exercised | (1,031) | | 0.81 | | | | | | | | | | | | | | | Outstanding as of September 30, 2026 | 1,690 | | $ | 0.89 | | | 4.8 | | $ | 600,125 | | | Vested and expected to vest as of September 30, 2026 | 1,690 | | $ | 0.89 | |
| 4.8 |
| $ | 600,125 | | | Exercisable as of September 30, 2026 | 1,672 | | $ | 0.90 | | | 4.7 | | $ | 593,595 | |
As of September 30, 2026, there was approximately $0.3 million of total unrecognized compensation cost, related to unvested stock options, which is expected to be recognized over a weighted-average remaining requisite service period of 0.9 years, using the straight-line method. Restricted Stock Units (“RSUs”) A summary of RSU activity under the 2018 Plan and 2024 Plan is as follows (in thousands, except per share data): | | | | | | | | | | | | | | | Number of Restricted Stock Units | | Weighted Average Grant Date Fair Value (per share) | | | | Outstanding as of December 31, 2025 | 9,354 | | $ | 51.39 | | | | | Granted | 3,055 | | 219.28 | | | | | Vested | (3,320) | | 46.58 | | | | | Cancelled and forfeited | (626) | | 85.53 | | | | | Outstanding as of September 30, 2026 | 8,463 | | $ | 111.36 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
As of September 30, 2026, there was $802.9 million of unrecognized stock-based compensation expense related to unvested RSUs, which is expected to be recognized over a weighted-average period of 2.1 years. Performance Stock Units (“PSUs”) A summary of PSU activity under the 2024 Plan is as follows (in thousands, except per share data): | | | | | | | | | | | | | | | Number of Performance Stock Units | | Weighted Average Grant Date Fair Value ( per share) | | | | Outstanding as of December 31, 2025 | 177 | | $ | 126.64 | | | | | Granted | 220 | | 154.08 | | | | | Vested | (37) | | 128.34 | | | | | Cancelled and forfeited | (34) | | 144.84 | | | | | Outstanding as of September 30, 2026 | 326 | | $ | 143.05 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
As of September 30, 2026, there was $30.7 million of unrecognized stock-based compensation expense related to these PSUs, which is expected to be recognized over a weighted-average period of 2.1 years.
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