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Stock Based Compensation
9 Months Ended
Sep. 28, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation
Stock Based Compensation
Stock option activity for 2019 is summarized in the following table:
 
Shares 
subject to
option
 
Weighted
average 
exercise price
per share
 
Aggregate intrinsic value (in millions)
Outstanding at December 29, 2018
3,630,684

 
$
55.66

 
 
Expired / Forfeited
(95,924
)
 
52.48

 
 
Outstanding at September 28, 2019
3,534,760

 
$
55.75

 
$

Exercisable at September 28, 2019
2,359,616

 
$
59.23

 
$


The Company also has time-vested, performance-vested and market-vested share awards. The activity for such awards in 2019 is summarized in the following table:
 
Shares
outstanding
 
Weighted average
grant date fair value
December 29, 2018
684,184

 
$
47.68

Time-vested shares granted
160,961

 
18.02

Market-vested shares granted
42,365

 
27.12

Performance shares granted
111,536

 
30.90

Performance share adjustments
(99,101
)
 
37.72

Vested
(131,740
)
 
48.23

Forfeited
(151,771
)
 
43.78

September 28, 2019
616,434

 
$
37.93


Compensation expense related to the Company's stock-based compensation for the third quarter and year-to-date periods ended September 28, 2019 and September 29, 2018 were as follows:
 
Third Quarter
 
Year-to-Date
(In millions)
2019
 
2018
 
2019
 
2018
Stock options
$
0.6

 
$
0.9

 
$
1.8

 
$
2.6

Time, performance and market vested share awards
2.4

 
2.8

 
5.7

 
8.1


As of September 28, 2019, total unrecognized stock-based compensation expense related to all stock based awards was $14.6 million, which is expected to be recognized over a weighted average period of 1.6 years.