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Note 3 - Stock-based Compensation | 9 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | 3. STOCK-BASED COMPENSATION 2014 Equity Incentive Plan In April 2013, the Board of Directors adopted the Company’s 2014 Equity Incentive Plan (the “2014 Plan”), which the Company’s stockholders approved in June 2013. In October 2014, the Board of Directors approved certain amendments to the 2014 Plan. The amended 2014 Plan became effective on November 13, 2014 and provided for the issuance of up to 5.5 million shares. In April 2020, the Board of Directors further amended and restated the amended 2014 Plan (the “Amended and Restated 2014 Plan”), which the Company’s stockholders approved in June 2020. The Amended and Restated 2014 Plan became effective on June 11, 2020 and provides for the issuance of up to 10.5 million shares. The Amended and Restated 2014 Plan will cease being available for new awards on June 11, 2030. As of September 30, 2025, 3.6 million shares remained available for future issuance under the Amended and Restated 2014 Plan. Stock-Based Compensation Expense The Company recognized stock-based compensation expense as follows (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of revenue |  | $ | 1,916 |  |  | $ | 1,576 |  |  | $ | 5,502 |  |  | $ | 4,585 |
Research and development (“R&D”) |  |  | 12,578 |  |  |  | 11,331 |  |  |  | 36,725 |  |  |  | 33,460 |
Selling, general and administrative (“SG&A”) |  |  | 46,183 |  |  |  | 38,491 |  |  |  | 131,354 |  |  |  | 111,585 |
Total stock-based compensation expense |  | $ | 60,677 |  |  | $ | 51,398 |  |  | $ | 173,581 |  |  | $ | 149,630 |
Tax benefit related to stock-based compensation (1) |  | $ | 756 |  |  | $ | 766 |  |  | $ | 1,919 |  |  | $ | 2,272 |
(1) | Amount reflects the tax benefit related to stock-based compensation recorded for equity awards that are expected to generate tax deductions when they vest in future periods. Equity awards granted to the Company’s executive officers are subject to the tax deduction limitations set by Section 162(m) of the Internal Revenue Code.
Restricted Stock Units (“RSUs”) The Company’s RSUs include time-based RSUs, RSUs with performance conditions (“PSUs”), RSUs with market conditions (“MSUs”), and RSUs with both market and performance conditions (“MPSUs”). Vesting of awards with performance conditions or market conditions is subject to the achievement of pre-determined performance or market goals and the approval of such achievement by the Compensation Committee of the Board of Directors (the “Compensation Committee”). All awards include service conditions which require continued employment with or service to the Company. A summary of RSU activity is presented in the table below (in thousands, except per-share amounts):
|  | Time-Based RSUs |  | PSUs and MPSUs |  | MSUs |  | Total
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |  |  |  |  |  | Weighted-
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  | Average |  |  |  |  |  | Average
|  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |  |  |  |  |  | Grant Date |  |  |  |  |  | Grant Date
|  | Number of |  | Fair Value |  | Number of |  |  | Fair Value |  | Number of |  | Fair Value |  | Number of |  | Fair Value
|  | Shares |  | Per Share |  | Shares |  |  | Per Share |  | Shares |  | Per Share |  | Shares |  | Per Share
Outstanding at January 1, 2025 |  |  | 85 |  |  | $ | 516.12 |  |  |  | 681 |  |  |  | $ | 524.08 |  |  |  | 938 |  |  | $ | 203.32 |  |  |  | 1,704 |  |  | $ | 347.01 |
Granted |  |  | 38 |  |  | $ | 650.32 |  |  |  | 274 |  | (1) |  | $ | 564.69 |  |  |  | - |  |  | $ | - |  |  |  | 312 |  |  | $ | 574.95 |
Vested |  |  | (33 | ) |  | $ | 477.06 |  |  |  | (40 | ) |  |  | $ | 400.90 |  |  |  | - |  |  | $ | - |  |  |  | (73 | ) |  | $ | 435.39 |
Forfeited |  |  | (5 | ) |  | $ | 565.80 |  |  |  | (4 | ) |  |  | $ | 526.65 |  |  |  | (11 | ) |  | $ | 297.45 |  |  |  | (20 | ) |  | $ | 413.13 |
Outstanding at September 30, 2025 |  |  | 85 |  |  | $ | 589.21 |  |  |  | 911 |  |  |  | $ | 541.13 |  |  |  | 927 |  |  | $ | 202.25 |  |  |  | 1,923 |  |  | $ | 379.76 |
(1) | Amount reflects the number of awards that may ultimately be earned based on management’s probability assessment of the achievement of performance conditions at each reporting period.
The intrinsic value related to vested RSUs was $49.6 million and $494.4 million for the nine months ended September 30, 2025 and 2024, respectively. The decrease in the intrinsic value was primarily due to the timing of vested RSUs. As of September 30, 2025, the total intrinsic value of all outstanding RSUs was $1.7 billion, based on the closing stock price of $920.64. As of September 30, 2025, unamortized compensation expense related to all outstanding RSUs was $260.7 million with a weighted-average remaining recognition period of approximately two years. Time-Based RSUs: For the nine months ended September 30, 2025, the Compensation Committee granted 38,000 RSUs with service conditions to non-executive employees and non-employee directors. The RSUs generally vest over four years for employees and one year for directors, subject to continued service with the Company. 2025 PSUs: In February 2025, the Compensation Committee granted 50,000 PSUs to the executive officers, which represent the target number of shares that can be earned based on the degree of achievement of two sets of independent performance goals (“2025 Executive PSUs”). For the first goal, the executive officers can earn up to 300% of the target number of the 2025 Executive PSUs based on the achievement of the Company’s three-year (2025 through 2027) average revenue growth rate in excess of the analog industry’s three-year average revenue growth rate as published by the Semiconductor Industry Association (the “SIA”). For the second goal, the executive officers can earn up to 200% of the target number of the 2025 Executive PSUs based on the achievement of the Company’s three-year (2025 through 2027) total stockholder return percentile ranking relative to the constituent entities in the Philadelphia Semiconductor Sector Index (the “PHLX Index”). For both goals, a percentage of the 2025 Executive PSUs will fully vest on December 31, 2027, depending on the degree to which the pre-determined goals are met during the performance period. Assuming the achievement of the highest level of the performance goals, the total stock-based compensation cost for the 2025 Executive PSUs will be $138.5 million. In February 2025, the Compensation Committee granted 11,000 PSUs to certain non-executive employees, which represent the target number of shares that can be earned based on the degree of achievement of the Company’s 2026 revenue goals for certain regions or product line divisions, or based on the degree of achievement of the Company’s two-year (2025 and 2026) average revenue growth rate compared against the analog industry’s two-year average revenue growth rate as published by the SIA (“2025 Non-Executive PSUs”). The maximum number of shares that an employee can earn is either 200% or 300% of the target number of the 2025 Non-Executive PSUs, depending on the job classification of the employee. 50% of the 2025 Non-Executive PSUs will vest in the first quarter of 2027 depending on the degree to which the pre-determined goals are met during the performance period. The remaining 2025 Non-Executive PSUs will vest over the following two years on a quarterly or annual basis. Assuming the achievement of the highest level of performance goals, the total stock-based compensation cost for the 2025 Non-Executive PSUs will be $16.5 million. The 2025 Executive PSUs and the 2025 Non-Executive PSUs contain a purchase price feature, which requires the employees to pay the Company $30 per share upon vesting of the shares. The $30 purchase price requirement is deemed satisfied and waived if the Company’s stock price on the last trading day of the performance period is $30 higher than the grant date stock price of $656.29. The Company determined the grant date fair value of the 2025 Executive PSUs and the 2025 Non-Executive PSUs using a Monte Carlo simulation model with the following assumptions: stock price of $656.29, simulation term of three years, expected volatility of 54.42%, risk-free interest rate of 4.20%, and expected dividend yield of 0.95%. The Monte Carlo simulation model for the 2025 Executive PSUs further utilized correlation coefficients of peer companies of 0.46 to 0.76. The correlation coefficients were based on peer companies in the PHLX Index as an aggregate benchmark for determining the market-based total stockholder return component. There is no illiquidity discount because the awards do not contain any post-vesting sales restrictions.

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