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Statements of Changes in Net Assets - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Statement of Stockholders' Equity [Abstract] |  |  |
Opening balance (in shares) | 12,200,000 | 10,850,000 | 11,500,000
Opening balance | $ 1,018,947 | $ 997,446 | $ 1,096,553
Net investment loss | (9,189) | (5,968) | (5,772)
Realized gain / (loss) on investment in platinum | 95,591 | (80) | 8,070
Change in unrealized gain/(loss) on investment in platinum | $ 1,255,228 | $ (88,636) | $ (35,102)
Creations (in shares) | 6,800,000 | 2,550,000 | 1,500,000
Creations | $ 913,597 | $ 221,982 | $ 133,843
Redemptions (in shares) | (3,450,000) | (1,200,000) | (2,150,000)
Redemptions | $ (411,206) | $ (105,797) | $ (200,146)
Closing balance (in shares) | 15,550,000 | 12,200,000 | 10,850,000
Closing balance | $ 2,862,968 | $ 1,018,947 | $ 997,446

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