Chinese markets experienced significant gains, with the FXI index rising 7.4%, marking its best performance since September. The surge follows China's announcement of 'more proactive' fiscal stimulus measures and 'moderately' looser monetary policy. Traders who invested heavily in bullish options on leveraged ETFs, such as $CHAU and $YINN, have seen substantial profits. Notably, a trader holding over 200,000 $CHAU May 15 call contracts has reportedly gained more than $30 million. Another trader laid down $135 million in call premium on a 3x leveraged ETF. The market rally aligns with China's reaffirmation of its 2025 policy direction, which had been anticipated for months.