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.
|