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Equity and Stock-Based Compensation | 12 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Equity and Stock-Based Compensation | 13. Equity and Stock-B ased Compensation Stock Repurchase Plans The following table summarizes information related to our stock repurchase plans, in thousands, except share and per share amounts:
Name of Stock Repurchase Plan | Date Approved by Board | Plan Term | Amount Authorized ($) |  | Amount Used for Repurchases ($) |  | Average Price Paid per Share ($) |  | Shares Repurchased (#) |  | Amount Available for Repurchases ($) |  | Plan Status | Fiscal Year of Repurchases |
2023 Stock Repurchase Plan | 2/7/2023 | 1 year |  | 5,000 |  |  | — |  |  | — |  |  | — |  |  | 5,000 |  | Open | NA |
2022 Stock Repurchase Plan | 2/10/2022 | 1 year |  | 5,000 |  |  | 1,400 |  | 9.78 |  |  | 143,430 |  |  | — |  | Expired |  | 2022 |
2021 Stock Repurchase Plan | 2/9/2021 | 1 year |  | 4,000 |  |  | 2,700 |  | 9.31 |  |  | 291,383 |  |  | — |  | Expired |  | 2022 |
All repurchased shares have been retired. Stock-Based Compensation Expense Stock-based compensation expenses of $1.3 million, $0.5 million and $0.4 million for 2023, 2022 and 2021, respectively, are included in selling, general and administrative expenses. As of September 30, 2023, total compensation cost related to non-vested stock options not yet recognize d is $1.0 m illion, which is expected to be recognized over the next 1.52 y ears on a weighted-average basis. As of September 30, 2023, total compensation cost related to nonvested RSUs not yet recognized i s $0.5 million, which is expected to be recognized over the next year. Amtech Equity Compensation Plans The 2022 Plan, under which 1,000,000 shares could be granted, was adopted by the Board of Directors in November 2021, and approved by the shareholders in March 2022. The 2007 Plan, under which 500,000 shares could be granted, was adopted by the Board in April 2007, and approved by the shareholders in May 2007. The 2007 Plan was amended in 2009, 2014 and 2015 to add 2,500,000 shares. The plan was also amended in 2019 to extend the term of the plan and allow for the grant of restricted stock units. Upon the adoption of the 2022 Plan, no further awards will be granted from the 2007 Plan. Previously issued awards will remain outstanding in accordance with their terms. The Non-Employee Directors Stock Option Plan was approved by the shareholders in 1996 for issuance of up to 100,000 shares of common stock to directors. The Non-Employee Directors Stock Option Plan was amended in 2005, 2009 and 2014 to add 400,000 shares. The plan was also amended in 2020 to extend the term of the plan. Upon the adoption of the 2022 Plan as stated above, no further awards will be granted from the Non-Employee Directors Stock Option Plan. Previously issued awards will remain outstanding in accordance with their terms. Equity compensation plans as of September 30, 2023 are summarized in the table below:
Name of Plan |  | Shares Authorized |  |  | Shares Available for Grant |  |  | Options Outstanding |  |  | Unvested RSUs Outstanding |  |  | Plan Expiration
2022 Plan |  |  | 1,000,000 |  |  |  | 558,268 |  |  |  | 340,750 |  |  |  | 75,977 |  |  | Mar. 2032
2007 Plan |  |  | 3,000,000 |  |  |  | — |  |  |  | 248,174 |  |  |  | — |  |  | Mar. 2024
Non-Employee Directors Stock Option Plan |  |  | 500,000 |  |  |  | — |  |  |  | 84,000 |  |  |  | — |  |  | Mar. 2024
|  |  |  |  |  | 558,268 |  |  |  | 672,924 |  |  |  | 75,977 |  |  |
Stock Options Stock options issued under the terms of our equity compensation plans have, or will have, an exercise price equal to or greater than the fair market value of the common stock at the date of the option grant and expire no later than 10 years from the date of grant. Options issued under the plans vest over 1 to 3 years. We estimated the fair value of stock option awards on the date of grant using the Black-Scholes option pricing model using the following assumptions:
|  | Years Ended September 30,
|  | 2023 |  | 2022 |  | 2021
Risk free interest rate |  | 4% |  | 2% |  | 1%
Expected life |  | 5 Years |  | 5 years |  | 6 years
Dividend rate |  | 0% |  | 0% |  | 0%
Volatility |  | 56% |  | 57% |  | 58%
The following table summarizes our stock option activity du ring 2023, 2022 and 2021:
|  | Years Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of period |  |  | 589,341 |  |  | $ | 8.06 |  |  |  | 608,269 |  |  | $ | 6.48 |  |  |  | 696,665 |  |  | $ | 7.00 |
Granted |  |  | 322,500 |  |  | $ | 9.04 |  |  |  | 135,500 |  |  | $ | 12.80 |  |  |  | 204,000 |  |  | $ | 6.25 |
Exercised |  |  | (168,318 | ) |  | $ | 6.01 |  |  |  | (124,475 | ) |  | $ | 5.78 |  |  |  | (241,320 | ) |  | $ | 6.40 |
Forfeited/expired |  |  | (70,599 | ) |  | $ | 10.73 |  |  |  | (29,953 | ) |  | $ | 6.92 |  |  |  | (51,076 | ) |  | $ | 13.01 |
Outstanding at end of period |  |  | 672,924 |  |  | $ | 8.76 |  |  |  | 589,341 |  |  | $ | 8.06 |  |  |  | 608,269 |  |  | $ | 6.48 |
Exercisable at end of period |  |  | 374,728 |  |  | $ | 8.25 |  |  |  | 358,343 |  |  | $ | 6.92 |  |  |  | 403,853 |  |  | $ | 6.87 |
Weighted average grant-date fair value of options granted during the period |  | $ | 4.73 |  |  |  |  |  | $ | 6.39 |  |  |  |  |  | $ | 3.33 |  |  |  |
The following table summarizes information for stock options outstanding and exercisable as of September 30, 2023:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding |  |  | Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price Per Share |  |  | Number Exercisable |  |  | Weighted Average Exercise Price Per Share |
$4.77-$5.26 |  |  | 71,183 |  |  |  | 5.07 |  |  | $ | 4.98 |  |  |  | 69,517 |  |  | $ | 4.97 |
$5.40-$5.52 |  |  | 17,550 |  |  |  | 4.18 |  |  | $ | 5.48 |  |  |  | 17,550 |  |  | $ | 5.48 |
$5.67-$5.67 |  |  | 71,791 |  |  |  | 7.13 |  |  | $ | 5.67 |  |  |  | 55,958 |  |  | $ | 5.67 |
$5.75-$8.82 |  |  | 111,250 |  |  |  | 7.54 |  |  | $ | 7.92 |  |  |  | 43,959 |  |  | $ | 7.01 |
$8.93-$8.93 |  |  | 5,000 |  |  |  | 9.66 |  |  | $ | 8.93 |  |  |  | — |  |  | $ | — |
$9.00-$9.00 |  |  | 150,000 |  |  |  | 9.87 |  |  | $ | 9.00 |  |  |  | 50,000 |  |  | $ | 9.00 |
$9.27-$9.27 |  |  | 90,500 |  |  |  | 9.17 |  |  | $ | 9.27 |  |  |  | 12,000 |  |  | $ | 9.27 |
$9.98-$10.22 |  |  | 80,000 |  |  |  | 3.28 |  |  | $ | 10.03 |  |  |  | 80,000 |  |  | $ | 10.03 |
$11.51-$11.51 |  |  | 12,000 |  |  |  | 7.48 |  |  | $ | 11.51 |  |  |  | 12,000 |  |  | $ | 11.51 |
$15.43-$15.43 |  |  | 63,650 |  |  |  | 8.07 |  |  | $ | 15.43 |  |  |  | 33,744 |  |  | $ | 15.43 |
$4.77-$15.43 |  |  | 672,924 |  |  |  | 7.44 |  |  | $ | 8.76 |  |  |  | 374,728 |  |  | $ | 8.25 |
The aggregate intrinsic values of options outstanding and options exercisable as of September 30, 2023 were approximate ly $0.4 million and $0.4 milli on, respectively, which represents the total pre-tax intrinsic value, based on our closing stock price of $7.62 per s hare as of September 29, 2023, the last business day of our fiscal year, which would have been received by the option holders had all option holders exercised their options as of that date. The total intrinsic value of stock options exercised w ere $0.6 milli on, $0.8 million and $0.8 million in 2023, 2022 and 2021, respectively. The following table summarizes our RSU activity during the year ended September 30, 2023:
|  | Number |  |  | Weighted Average Grant Date Fair Value |  |  | Fair Value |  |
Nonvested at beginning of year |  |  | — |  |  | $ | — |  |  | $ | — |  |
Granted |  |  | 78,977 |  |  |  | 9.17 |  |  |  | 723,856 |  |
Vested |  |  | (3,000 | ) |  |  | 9.61 |  |  |  | 28,830 |  | (1)
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |
Nonvested at end of period |  |  | 75,977 |  |  | $ | 9.15 |  |  | $ | 578,945 |  | (2)
(1) The aggregate fair value of vested RSU's represent the total pre-tax fair value, based on the closing stock price on the day of vesting, which would have been received by holders of RSU's had all such holders sold their underlying shares on that date. (2) The aggregate fair value of the nonvested RSU's and represents the total pre-tax fair value, based on our closing stock price of $7.62 as of September 29, 2023, the last trading day of our fiscal year, which would have been received by holders of RSU's had all such holders sold their underlying shares on that date.

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