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TAXATION - Income Tax - Applicable Tax Rates (Details) $ in Thousands, $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Apr. 01, 2018 USD ($) | Dec. 22, 2017 | Dec. 21, 2017 | Dec. 31, 2022 | Dec. 31, 2025 HKD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($)
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  | 16.50% |  |
Undistributed earnings from subsidiaries and consolidated VIEs for which no withholding tax has been accrued |  |  |  |  |  | $ 5,505,000 | $ 4,168,000 |
Global minimum tax under pillar two framework |  |  |  |  |  | 15.00% |  |
Effective income tax rate |  |  |  |  |  | 17.20% |  |
Current tax provision |  |  |  |  |  | $ 2,438,625 | $ 1,016,317 | $ 763,248
Pillar Two |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Global minimum tax under pillar two framework |  |  |  |  |  | 15.00% |  |
Current tax provision |  |  |  |  |  | $ 321,000 |  |
United States |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  | 21.00% | 35.00% |  |  |  |
Hong Kong |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  | 16.50% | 16.50%
Hong Kong | Assessable profits on the first HK$2 million |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  | 8.25% |  |  |  |  |  |
Threshold assessable profits |  | $ 2 |  |  |  |  |  |
Hong Kong | Assessable profits in excess of HK$2 million |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  | 16.50% |  |  |  |  |  |
Threshold assessable profits |  | $ 2 |  |  |  |  |  |
China |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  | 25.00% |  |
Preferential tax rate (as a percent) |  |  |  |  |  | 15.00% |  |
Super deduction of research and development expenses (as a percent) |  |  |  |  |  | 175.00% |  |
Pre-tax deduction ratio for R&D expenses | 75.00% |  |  |  | 100.00% |  |  |
Withholding tax rate (as a percent) |  |  |  |  |  | 10.00% |  |
Withholding tax rate applicable to beneficial owner ( as a percent) |  |  |  |  |  | 5.00% |  |
Minimum equity interest in a resident enterprise that entitles beneficial owner reduced withholding tax rate |  |  |  |  |  | 25.00% |  |
China | Futu Network Technology (Shenzhen) Co., Ltd. |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  |  |  | 15.00% |  | 15.00%
Preferential tax rate, valid period |  |  |  |  |  | 3 years |  |
Singapore |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  | 17.00% |  |

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