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Statements of Changes in Net Assets (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]    
Opening balance (in shares) 12,200,000 10,850,000
Opening balance $ 1,018,947 $ 997,446
Net investment loss (1,562) (1,378)
Realized gain / (loss) on investment in platinum (22) (1,753)
Change in unrealized (loss) on investment in platinum $ 86,426 $ (90,173)
Creations (in shares) 250,000 600,000
Creations $ 22,392 $ 49,532
Redemptions (in shares) (700,000) (400,000)
Redemptions $ (61,576) $ (33,692)
Closing balance (in shares) 11,750,000 11,050,000
Closing balance $ 1,064,605 $ 919,982