According to @AltcoinDaily, the question highlights that multiple entities hold more BTC than Germany’s roughly 49,857 BTC seized in January 2024 from the Movie2k case (source: Saxony State Criminal Police Office; Arkham Intelligence). The largest include the US Government with over 200,000 BTC tracked on-chain (source: Arkham Intelligence), US spot Bitcoin ETFs such as BlackRock iShares Bitcoin Trust IBIT with well over 200,000 BTC and Fidelity Wise Origin Bitcoin Fund FBTC with over 100,000 BTC as per daily holdings (source: iShares; Fidelity), and Grayscale GBTC with holdings well above 50,000 BTC reported on its daily disclosure (source: Grayscale). Corporate treasuries like MicroStrategy held about 214,400 BTC as of late October 2024 (source: MicroStrategy investor relations), while the Mt. Gox Rehabilitation Trustee controls approximately 137,000 BTC pending distributions (source: Mt. Gox Rehabilitation Trustee notices). Major exchanges including Coinbase and Binance each custody well above 50,000 BTC in on-chain reserves (source: Glassnode; BitInfoCharts). Traders monitor these whale addresses and ETF creations/redemptions for potential supply overhang and liquidity shifts in BTC and altcoins (source: iShares and Fidelity daily flow reports; Arkham Intelligence trackers).