According to the source, Harvard Management Company's Q3 2025 Form 13F-HR filing shows the endowment held about $443 million of iShares Bitcoin Trust (IBIT), its largest declared U.S. equity position in the report, per SEC EDGAR. The Q3 filing indicates the IBIT stake is roughly triple the size reported in the prior Q2 2025 Form 13F-HR, per SEC EDGAR filings. The filing identifies the position as iShares Bitcoin Trust units (ticker IBIT), providing indirect BTC exposure via BlackRock's spot Bitcoin ETF, per SEC EDGAR.