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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2026
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 13. Stock-Based Compensation The Company's current equity compensation plan, the Insmed Incorporated Amended and Restated 2019 Incentive Plan (the 2019 Incentive Plan), was approved by shareholders at the Company's Annual Meeting of Shareholders on May 13, 2023. The 2019 Incentive Plan replaced the Insmed Incorporated 2019 Incentive Plan, as amended, and provided for awards of up to an aggregate of 24,250,000 shares (including the shares previously available for grant under the Insmed Incorporated 2019 Incentive Plan). At the Company's 2024 Annual Meeting of Shareholders, the Company's shareholders approved Amendment No. 1 to the 2019 Incentive Plan, which provides for the issuance of an additional 3,000,000 shares under the 2019 Incentive Plan. At the Company's 2025 Annual Meeting of Shareholders, the Company's shareholders approved Amendment No. 2 to the 2019 Incentive Plan, which provides for the issuance of an additional 10,000,000 shares under the 2019 Incentive Plan. As of June 30, 2026, 10,334,057 shares remain available for future issuance under the 2019 Incentive Plan. The 2019 Incentive Plan will terminate on April 3, 2029, unless it is extended or terminated earlier pursuant to its terms. In addition, from time to time, the Company makes inducement grants of stock options and RSUs to new hires, which awards are made pursuant to the Nasdaq's inducement grant exception to the shareholder approval requirement for grants of equity compensation. The Company granted inducement stock options and RSUs covering 183,598 shares of the Company's common stock to new employees during the six months ended June 30, 2026. In February 2025, the Company adopted the Insmed Incorporated 2025 Inducement Plan, under which the Company is authorized to grant a variety of inducement awards, including stock options and RSUs, up to an aggregate of 1,000,000 shares, as an inducement to become an employee of the Company or any of its subsidiaries. As of June 30, 2026, 516,635 shares remain available for future issuance under the Insmed Incorporated 2025 Inducement Plan. On May 15, 2018, the 2018 Employee Stock Purchase Plan (ESPP) was approved by shareholders at the Company's 2018 Annual Meeting of Shareholders. The ESPP allows eligible employees to acquire an ownership interest in the Company by purchasing common stock, at a discount, through payroll deductions. The Company has reserved the following for issuance under the ESPP: (i) 1,000,000 shares of common stock, plus (ii) commencing on January 1, 2019 and ending on December 31, 2023, an additional number of shares added on the first day of each calendar year equal to the lesser of (A) 1,200,000 shares of common stock, (B) 2% of the number of outstanding shares of common stock on such date and (C) an amount determined by the administrator. Stock Options—As of June 30, 2026, there was $146.7 million of unrecognized compensation expense related to unvested stock options. As of June 30, 2026, the Company had performance-conditioned options totaling 114,780 shares outstanding which had not yet met the recognition criteria. Restricted Stock Units—As of June 30, 2026, there was $248.9 million of unrecognized compensation expense related to unvested RSU awards. Performance Stock Units—As of June 30, 2026, there were 92,219 PSUs outstanding with an unrecognized compensation expense of $18.1 million, which assumes a 100% payout for these awards. The following table summarizes the aggregate stock-based compensation expense recorded in the consolidated statements of comprehensive loss related to stock options, RSUs, PSUs and the ESPP during the three and six months ended June 30, 2026 and 2025 (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Research and development expenses | $ | 20,292 |  |  | $ | 15,970 |  |  | $ | 44,286 |  |  | $ | 33,350 |
Selling, general and administrative expenses | 20,962 |  |  | 27,006 |  |  | 42,722 |  |  | 48,888 |
Total stock-based compensation expense | $ | 41,254 |  |  | $ | 42,976 |  |  | $ | 87,008 |  |  | $ | 82,238 |

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