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SHARE-BASED COMPENSATION - Share-based compensation expenses (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2025 HKD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($)
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | $ 343,024 | $ 44,072 | $ 334,926 | $ 290,831
Research and development expenses |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | 226,490 |  | 230,830 | 201,033
General and administrative expenses |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | 88,091 |  | 81,966 | 69,560
Selling and marketing expenses |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | $ 28,443 |  | $ 22,130 | $ 20,238

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