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Share-Based Compensation and Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation and Employee Benefit Plans | 10. Share-Based Compensation and Employee Benefit Plans: Share-Based Compensation Plans The Company’s share-based compensation plans are intended to attract and retain employees and to provide an incentive for them to assist the Company to achieve long-range performance goals and to enable them to participate in long-term growth of the Company. The Company settles restricted stock unit awards, employee stock purchase option exercises and stock option exercises with newly issued common shares. Onto Innovation Inc. 2020 Stock Plan (the “2020 Plan”). The 2020 Plan provides for the grant of 3,744 stock options and other stock awards to employees, directors and consultants at an exercise price equal to the fair market value of the common stock on the date of grant. Options granted under the 2020 Plan typically grade vest over a three-year period and expire ten years from the date of grant. Restricted stock units granted under the 2020 Plan typically vest over a three-year period for employees and one year for directors; however, other vesting periods are allowable under the 2020 Plan. Restricted stock units (“RSU”) granted to employees have time based or performance-based vesting. As of December 31, 2022, there were 3,086 shares of common stock available for issuance pursuant to future grants under the 2020 Plan. Onto Innovation Inc. 2020 Employee Stock Purchase Plan (the “2020 ESPP”). Under the terms of the 2020 ESPP, eligible employees may have up to 10 % of eligible compensation deducted from their pay and applied to the purchase of shares of Company common stock. The price the employee pays for each share of stock is 85 % of the lesser of the fair market value of Company common stock at the beginning or the end of the applicable six-month purchase period. The 2020 ESPP is intended to qualify under Section 423 of the Internal Revenue Code and is a compensatory plan as defined by FASB ASC 718, “Stock Compensation.” Through the Company’s employee stock purchase plans, employees purchased 142, 242 and 91 shares during the twelve months ended December 31, 2022, January 1, 2022 and December 26, 2020, respectively. As of December 31, 2022 and January 1, 2022, there were 1,116 and 1,258, shares available for issuance under the Company’s employee stock purchase plan, respectively. The following table reflects share-based compensation expense by type of award:
|  | Year Ended |
|  | December 31, 2022 |  |  | January 1, 2022 |  |  | December 26, 2020 |
Share-based compensation expense: |  |  |  |  |  |  |  |  |
Restricted stock units, including all performance and market based awards |  | $ | 21,729 |  |  | $ | 17,174 |  |  | $ | 15,780 |
Stock options and employee stock purchase options |  |  | 2,697 |  |  |  | 2,368 |  |  |  | 1,882 |
Total share-based compensation |  |  | 24,426 |  |  |  | 19,542 |  |  |  | 17,662 |
Tax effect on share-based compensation |  |  | 5,237 |  |  |  | 4,255 |  |  |  | 3,849 |
Net effect on net income |  | $ | 19,189 |  |  | $ | 15,287 |  |  | $ | 13,813 |
Effect on earnings per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.39 | ) |  | $ | (0.31 | ) |  | $ | (0.28 | )
Diluted |  | $ | (0.39 | ) |  | $ | (0.31 | ) |  | $ | (0.28 | )
Restricted Stock Units During fiscal years 2022, 2021 and 2020, the Company issued both service-based RSUs and market-based performance RSUs (“PRSUs”). Service-based RSUs typically vest over a period of 3 years or less. Market-based PRSUs generally vest three years from the grant date if certain performance criteria are achieved and require continued employment. Based upon the terms of such awards, the number of shares that can be earned over the performance periods is based on the Company’s Common Stock price performance compared to the market price performance of a designated benchmark index, ranging from 0% to 200% of target. The designated benchmark index was the Philadelphia Semiconductor Sector Index for market-based PRSUs issued in 2022, 2021 and 2020. The stock price performance or market price performance is measured using the closing price for the 20-trading days prior to the dates the performance period begins and ends. The following table summarizes the Company’s combined service-based RSUs and market-based PRSUs:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2019 |  |  | 1,107 |  |  | $ | 28.89 |
Granted |  |  | 498 |  |  | $ | 34.71 |
Vested |  |  | (498 | ) |  | $ | 29.46 |
Forfeited |  |  | (143 | ) |  | $ | 29.99 |
Nonvested at December 26, 2020 |  |  | 964 |  |  | $ | 31.37 |
Granted |  |  | 338 |  |  | $ | 69.82 |
Vested |  |  | (441 | ) |  | $ | 30.90 |
Forfeited |  |  | (96 | ) |  | $ | 42.40 |
Nonvested at January 1, 2022 |  |  | 765 |  |  | $ | 48.25 |
Granted |  |  | 410 |  |  | $ | 82.48 |
Vested |  |  | (373 | ) |  | $ | 42.87 |
Forfeited |  |  | (59 | ) |  | $ | 58.98 |
Nonvested at December 31, 2022 |  |  | 743 |  |  | $ | 69.01 |
Of the 743 shares outstanding at December 31, 2022, 644 are service-based RSUs and 99 are market-based PRSUs. The fair value of the Company’s service-based RSUs was calculated based on the fair market value of the Company’s stock at the date of grant. The fair value of the Company’s market-based PRSUs granted during fiscal years 2022, 2021, and 2020 was calculated using a Monte Carlo simulation model at the date of the grant, resulting in a weighted average grant-date fair value per share of $85.49, $80.04, and $47.86, respectively. As of December 31, 2022, there was $28,653 of total unrecognized compensation cost related to restricted stock units granted under the plans. That cost is expected to be recognized over a weighted average period of 1.5 years. 401(k) Savings Plan The Company has a 401(k) savings plan that allows employees to contribute up to 100% of their annual compensation to the Plan on a pre-tax or after-tax basis, limited to a maximum annual amount as set periodically by the Internal Revenue Service. The plan provides a 50% match of all employee contributions up to 6 percent of the employee’s salary. Matching contributions to the plan totaled $2,965, $2,544 and $2,315 for the years ended December 31, 2022, January 1, 2022 and December 26, 2020, respectively.

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