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Common Stock and Stock-Based Compensation
 12 Months Ended
May 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Common Stock and Stock-Based Compensation
NOTE 11 — COMMON STOCK AND STOCK-BASED COMPENSATION
COMMON STOCK
The authorized number of shares of Class A Common Stock, no par value, and Class B Common Stock, no par value, are 400 million and 2,400 million, respectively. Each share of Class A Common Stock is convertible into one share of Class B Common Stock. Voting rights of Class B Common Stock are limited in certain circumstances with respect to the election of directors. There are no differences in the dividend and liquidation preferences or participation rights of the holders of Class A and Class B Common Stock. From time to time, the Company's Board of Directors authorizes share repurchase programs for the repurchase of Class B Common Stock. The value of repurchased shares is deducted from Total shareholders' equity through allocation to Capital in excess of stated value and Retained earnings.
STOCK-BASED COMPENSATION
The NIKE, Inc. Stock Incentive Plan (the “Stock Incentive Plan”) provides for the issuance of up to 798 million previously unissued shares of Class B Common Stock in connection with equity awards granted under the Stock Incentive Plan. The Stock Incentive Plan authorizes the grant of non-statutory stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance-based awards. The exercise price for stock options and stock appreciation rights may not be less than the fair market value of the underlying shares on the date of grant. A committee of the Board of Directors administers the Stock Incentive Plan. The committee has the authority to determine the employees to whom awards will be made, the amount of the awards and the other terms and conditions of the awards. The Company generally grants stock options and restricted stock on an annual basis. Substantially all awards under the Stock Incentive Plan vest ratably over 4 years of continued employment, with stock options expiring 10 years from the date of grant.
The following table summarizes the Company's total stock-based compensation expense recognized in Cost of sales or Operating overhead expense, as applicable: 
 YEAR ENDED MAY 31,
(Dollars in millions)
202120202019
Stock options(1)
$323 $237 $207 
ESPPs63 53 40 
Restricted stock(1)
225 139 78 
TOTAL STOCK-BASED COMPENSATION EXPENSE$611 $429 $325 
(1)Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is primarily recorded for employees meeting certain retirement eligibility requirements and was $67 million, $53 million and $41 million for the fiscal years ended May 31, 2021, 2020 and 2019, respectively. During fiscal 2021, an immaterial amount of accelerated stock option and restricted stock expense was also recorded for certain employees impacted by the Company's organizational realignment. For more information, see Note 21 — Restructuring.
The income tax benefit related to stock-based compensation expense was $297 million, $207 million and $175 million for the fiscal years ended May 31, 2021, 2020 and 2019, respectively, and reported within Income tax expense.
STOCK OPTIONS
The weighted average fair value per share of the options granted during the years ended May 31, 2021, 2020 and 2019, computed as of the grant date using the Black-Scholes pricing model, was $26.75, $18.71 and $22.78, respectively. The weighted average assumptions used to estimate these fair values were as follows:
 YEAR ENDED MAY 31,
202120202019
Dividend yield0.9 %1.0 %1.0 %
Expected volatility27.3 %23.0 %26.6 %
Weighted average expected life (in years)6.06.06.0
Risk-free interest rate0.4 %1.5 %2.8 %
Expected volatilities are based on the historical volatility of the Company's common stock, the implied volatility in market traded options on the Company's common stock with a term greater than one year, as well as other factors. The weighted average expected life of options is based on an analysis of historical and expected future exercise patterns. The interest rate is based on the U.S. Treasury (constant maturity) risk-free rate in effect at the date of grant for periods corresponding with the expected term of the options.
The following summarizes the stock option transactions under the plan discussed above: 
SHARES(1)
WEIGHTED AVERAGE OPTION PRICE
(In millions)
Options outstanding as of May 31, 202088.1 $60.98 
Exercised(20.7)46.31 
Forfeited(3.8)95.87 
Granted14.7 112.65 
Options outstanding as of May 31, 202178.3 $72.88 
(1)Includes stock appreciation rights transactions.
Options exercisable as of May 31, 2021, were 44.2 million and had a weighted average option price of $57.43 per share. The aggregate intrinsic value for options outstanding and exercisable as of May 31, 2021, was $4,976 million and $3,494 million, respectively. The total intrinsic value of the options exercised during the years ended May 31, 2021, 2020 and 2019 was $1,571 million, $1,161 million and $938 million, respectively. The intrinsic value is the amount by which the market value of the underlying stock exceeds the exercise price of the options. The weighted average contractual life remaining for options outstanding and options exercisable as of May 31, 2021, was 5.9 years and 4.2 years, respectively. As of May 31, 2021, the Company had $415 million of unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized in Cost of sales or Operating overhead expense, as applicable, over a weighted average remaining period of 2.5 years.
EMPLOYEE STOCK PURCHASE PLANS
In addition to the Stock Incentive Plan, the Company gives employees the right to purchase shares at a discount from the market price under employee stock purchase plans (ESPPs). Subject to the annual statutory limit, employees are eligible to participate through payroll deductions of up to 10% of their compensation. At the end of each six-month offering period, shares are purchased by the participants at 85% of the lower of the fair market value at the beginning or the end of the offering period. Employees purchased 2.5 million, 2.7 million and 2.5 million shares during each of the fiscal years ended May 31, 2021, 2020 and 2019, respectively.
RESTRICTED STOCK AND RESTRICTED STOCK UNITS
Recipients of restricted stock are entitled to cash dividends and to vote their respective shares throughout the period of restriction. Recipients of restricted stock units are entitled to dividend equivalent cash payments upon vesting. The number of restricted stock and restricted stock units vested includes shares of common stock withheld by the Company on behalf of employees to satisfy the minimum statutory tax withholding requirements.
The following summarizes the restricted stock and restricted stock unit activity under the plan discussed above: 
SHARESWEIGHTED AVERAGE GRANT DATE
FAIR VALUE
(In millions)
Nonvested as of May 31, 20206.8 $79.84 
Vested(2.7)76.95
Forfeited(1.1)81.70
Granted3.6 113.84
Nonvested as of May 31, 20216.6 $99.70
The weighted average fair value per share of restricted stock and restricted stock units granted for the years ended May 31, 2021, 2020 and 2019, computed as of the grant date, was $113.84, $88.26 and $80.95, respectively. During the years ended May 31, 2021, 2020 and 2019, the aggregate fair value of restricted stock and restricted stock units vested was $310 million, $98 million and $44 million, respectively, computed as of the date of vesting. As of May 31, 2021, the Company had $448 million of unrecognized compensation costs from restricted stock and restricted stock units, net of estimated forfeitures, to be recognized in Cost of sales or Operating overhead expense, as applicable, over a weighted average remaining period of 2.5 years.