Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.20.2
Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 24, 2020
Share-based Payment Arrangement [Abstract]  
Stock Option Activity Stock option activity during the thirty-nine weeks ended September 24, 2020 was as follows:
​ Options Weighted Average Exercise Price
Outstanding at December 27, 2019 6,037,079  $ 13.64 
Granted 279,504  57.25 
Exercised (2,027,087) 7.49 
Forfeited or expired (100,539) 25.10 
Outstanding at September 24, 2020 4,188,957  $ 19.25 
Vested and exercisable at September 24, 2020 2,083,405  $ 11.03 
Estimated Fair Value of Stock Option Grants
The Company estimated the fair value of stock option grants using the Black-Scholes-Merton option pricing model with the following weighted average assumptions during the period:
​ Thirty-nine Weeks Ended
​ September 24, 2020
Risk-free interest rate 1.21  %
Expected volatility 38.7  %
Expected life (in years) 5.75
Dividend yield —  %
Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity during the thirty-nine weeks ended September 24, 2020:
Restricted Stock Units
Unvested at December 27, 2019 — 
Granted 115,765 
Vested — 
Forfeited (3,728)
Unvested at September 24, 2020 112,037 
Restricted Stock Award Activity
The following table summarizes restricted stock award activity during the thirty-nine weeks ended September 24, 2020:
Restricted Stock Awards
Service-based Performance-based TSR
Unvested at December 27, 2019 37,032  —  — 
Granted 102,931  160,315  104,456 
Vested (3,870) —  — 
Forfeited —  —  — 
Unvested at September 24, 2020 136,093  160,315  104,456