Movements in the number of share options outstanding and their related weighted average exercise prices are as follows:
| 2015 | 2016 | 2017 | ||||||||||||||||||||||
| Average exercise price in HKD per share |
Number of share options involved |
Average exercise price in HKD per share |
Number of share options involved |
Average exercise price in HKD per share |
Number of share options involved |
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Balance, beginning of year |
6.35 | 3,540,000 | — | — | — | — | ||||||||||||||||||
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Lapsed |
6.35 | (3,432,000 | ) | — | — | — | — | |||||||||||||||||
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Exercised |
6.35 | (108,000 | ) | — | — | — | — | |||||||||||||||||
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Balance, end of year |
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Exercisable at end of year |
— | — | — | — | — | — | ||||||||||||||||||
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