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Equity Compensation Plans | 9 Months Ended
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Feb. 28, 2021
Equity Compensation Plans | 8. EQUITY COMPENSATION PLANS Incentive and non-qualified options to purchase shares of common stock have been granted to directors, officers and employees of Neogen under the terms of the Company’s stock option plans. These options are granted at an exercise price of not less than the fair market value of the stock on the date of grant. Options vest ratably over three and five year periods and the contractual terms are generally five or ten years. A summary of stock option activity during the nine months ended February 28, 2021 follows:​​​​​​​
(Options in thousands) |  | Shares |  |  | Weighted- Average Exercise Price |
Options outstanding June 1, 2020 |  |  | 2,162 |  |  | $ | 55.96 |
Granted |  |  | 261 |  |  |  | 68.47 |
Exercised |  |  | (491 | ) |  |  | 44.91 |
Forfeited |  |  | (179 | ) |  |  | 57.58 |
Options outstanding February 28, 2021 |  |  | 1,753 |  |  | $ | 58.41 |
The weighted-average fair value per share of stock options granted during the first nine months of fiscal years 2021 and 2020, estimated on the date of grant using the Black-Scholes option pricing model, was $15.41 and $15.56, respectively. The fair value of stock options granted was estimated using the following weighted-average assumptions.​​​​​​​
|  | FY2021 |
Risk-free interest rate |  |  | 0.2 | %
Expected dividend yield |  |  | 0.0 | %
Expected stock price volatility |  |  | 31.3 | %
Expected option life |  |  | 3.25 years |
The Company granted 59,125 restricted stock units (RSUs) to directors, officers and employees under the terms of the 2018 Omnibus Incentive Plan in October 2020, which vest ratably over three and five year periods. R SU s have a weighted average value of $68.43 per share and will be expensed straight-line over the remaining weighted-average period of 4.49 years. On February 28, 2021 there was $3,144,000 in unamortized compensation cost related to non-vested RSUs. During the three and nine month periods ended February 28, 2021 and February 29, 2020, the Company recorded $1,581,000 and $1,640,000 and $4,773,000 and $4,795,000, respectively, of compensation expense related to its share-based awards. The Company offers eligible employees the option to purchase common stock at a 5% discount to the lower of the market value of the stock at the beginning or end of each participation period under the terms of the 2011 Employee Stock Purchase Plan; the discount is recorded in general and administrative expense. Total individual purchases in any year are limited to 10% of compensation.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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