Changes in the number of stock options and the weighted-average exercise price as of December 31, 2016 and 2017, are as follows:
| 2016 | ||||||||||||||||||||||||||||
| Beginning | Granted | Expired | Forfeited | Exercised1 | Ending | Number of shares exercisable |
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9th grant |
₩ | 263,123 | ₩ | 54,913 | ₩ | 181,685 | ₩ | — | ₩ | 136,351 | ₩ | — | ₩ | — | ||||||||||||||
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10th grant |
— | 318,506 | — | — | — | 318,506 | — | |||||||||||||||||||||
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Total |
₩ | 263,123 | ₩ | 373,419 | ₩ | 181,685 | ₩ | — | ₩ | 136,351 | ₩ | 318,506 | ₩ | — | ||||||||||||||
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| 2017 | ||||||||||||||||||||||||||||
| Beginning | Granted | Expired | Forfeited | Exercised1 | Ending | Number of shares exercisable |
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10th grant |
₩ | 318,506 | ₩ | — | ₩ | 193,094 | ₩ | — | ₩ | 125,412 | ₩ | — | ₩ | — | ||||||||||||||
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11th grant |
— | 316,949 | — | — | — | 316,949 | — | |||||||||||||||||||||
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Total |
₩ | 318,506 | ₩ | 316,949 | ₩ | 193,094 | ₩ | — | ₩ | 125,412 | ₩ | 316,949 | ₩ | — | ||||||||||||||
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| 1 | The weighted average price of ordinary shares at the time of exercise during 2017 was ₩31,797 (2016: ₩31,750). |