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STOCK-BASED COMPENSATION
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATIONWe issue restricted stock units (“RSUs”), which consist of time-based and performance-based awards, to employees under stock awards plans approved by stockholders. In addition, RSUs are issued to non-employee directors under a Restricted Stock Unit Award Agreement for Directors pursuant to the Company’s 2018 Equity Incentive Plan. RSUs granted to employees vest according to a specified performance period and/or vesting period. Time-based RSUs generally vest over three years. Performance-based RSUs vest at the end of the specified performance period, generally three years, assuming required performance or market vesting conditions are met. Performance-based RSUs have one of two vesting conditions: (1) based on our internal financial performance metrics and (2) based on our total shareholder return (“TSR”) relative to total shareholder returns of an industrial peer group. At the time of vesting, the vested shares of common stock are issued in the employee’s name. In addition, RSU awards are generally net settled (shares are withheld to cover the employee tax obligation). RSUs granted to directors are only time-based and generally vest over one year.
The fair value of both time-based RSUs and performance-based RSUs pertaining to internal performance metrics is determined using the closing price of our common stock on the grant date. The fair value of performance-based RSUs pertaining to TSR is estimated using a Monte Carlo simulation. Inputs and assumptions used to calculate the fair value are shown in the table below. The fair value of these RSUs is expensed over the vesting period using the straight-line method or using the graded vesting method when an employee becomes eligible to retain the award at retirement.
Three Months Ended March 31,20212020
Fair value per stock award$171.63 $94.98 
Grant date stock price$141.59 $83.93 
Assumptions:
Aptar's stock price expected volatility21.40 %23.80 %
Expected average volatility of peer companies50.00 %48.50 %
Correlation assumption58.10 %63.50 %
Risk-free interest rate0.32 %0.31 %
Dividend yield assumption1.02 %1.72 %
A summary of RSU activity as of March 31, 2021 and changes during the three month period then ended is presented below:
Time-Based RSUsPerformance-Based RSUs
UnitsWeighted Average
Grant-Date Fair Value		UnitsWeighted Average
Grant-Date Fair Value
Nonvested at January 1, 2021576,198 $92.47 590,064 $100.27 
Granted128,297 137.97 169,268 152.47 
Vested(118,349)89.95 (71,994)128.70 
Forfeited(2,785)95.77 (31,338)91.23 
Nonvested at March 31, 2021583,361 $106.33 656,000 $111.05 
Included in the March 31, 2021 time-based RSUs are 12,379 units granted to non-employee directors.
Three Months Ended March 31,20212020
Compensation expense$11,262 $8,281 
Fair value of units vested19,116 9,303 
Intrinsic value of units vested25,699 11,475 
The actual tax benefit realized for the tax deduction from RSUs was approximately $2.1 million in the three months ended March 31, 2021. As of March 31, 2021, there was $69.9 million of total unrecognized compensation cost relating to RSU awards which is expected to be recognized over a weighted-average period of 1.9 years.
Historically we issued stock options to our employees and non-employee directors. Beginning in 2019, we no longer issue stock options. Stock options were awarded with the exercise price equal to the market price on the date of grant and generally vest over three years and expire 10 years after grant. For stock option grants, we used historical data to estimate expected life and volatility.
 A summary of option activity under our stock plans during the three months ended March 31, 2021 is presented below:
Stock Awards PlansDirector Stock Option Plans
OptionsWeighted Average
Exercise Price		OptionsWeighted Average
Exercise Price
Outstanding, January 1, 20213,998,047 $70.28 99,200 $60.80 
Granted— — — — 
Exercised(507,468)63.37 (29,500)58.76 
Forfeited or expired(4,519)75.27 — — 
Outstanding at March 31, 20213,486,060 $71.28 69,700 $61.66 
Exercisable at March 31, 20213,486,060 $71.28 69,700 $61.66 
Weighted-Average Remaining Contractual Term (Years):
Outstanding at March 31, 20214.72.5
Exercisable at March 31, 20214.72.5
Aggregate Intrinsic Value:
Outstanding at March 31, 2021$245,389 $5,577 
Exercisable at March 31, 2021$245,389 $5,577 
Intrinsic Value of Options Exercised During the Three Months Ended:
March 31, 2021$37,454 $2,474 
March 31, 2020$18,202 $1,385 
Three Months Ended March 31,20212020
Compensation expense (included in SG&A)$185 $743 
Compensation expense (included in Cost of sales)42 117 
Compensation expense, Total$227 $860 
Compensation expense, net of tax174 648 
Grant date fair value of options vested2,421 7,565 
The reduction in stock option expense is due to our move to RSUs as discussed above. Cash received from option exercises was approximately $31.9 million. The actual tax benefit realized for the tax deduction from option exercises was approximately $9.1 million and $4.8 million in the three months ended March 31, 2021 and March 31, 2020, respectively. As of March 31, 2021, there is no remaining valuation of stock option awards to be expensed in future periods.