Group 1 - The Chicago Mercantile Exchange announced an increase in the initial margin requirements for certain precious metal futures contracts, with COMEX 100 gold futures rising from 8% to 9% and COMEX 5000 silver futures from 15% to 18% [1] - The new margin standards will take effect after the market closes on February 6 [1] - The exchange stated that this adjustment is a result of a routine review of market volatility, aimed at ensuring adequate collateral coverage and maintaining the stability of the trading market [1] Group 2 - The Bank of China also announced that it will adjust the margin ratios and related trading parameters for individual participation in the Shanghai Gold Exchange's gold and silver deferred contracts, effective after the market closes on February 6 [1] - This adjustment is intended to mitigate market risks and protect investor interests [1]