Shares of the leveraged gold product CSOP Double Long Gold (07299) tumbled nearly 5% during the morning trading session, sliding 4.7% to HK$23.12 with a turnover of HK$18.71 million. The sell-off comes as investors reassess the inflation outlook following stronger-than-expected producer price data from the United States.

According to the latest figures from the U.S. Bureau of Labor Statistics, the final demand Producer Price Index (PPI) climbed 0.4% month-over-month in August, accelerating from the 0.1% increase recorded in the prior month. This hotter-than-anticipated reading has reignited concerns about persistent inflationary pressures across the world's largest economy.

Before the PPI release, financial markets had priced in roughly a 62% probability that the Federal Reserve would implement a 25-basis-point rate hike at its September 15-16 policy meeting, according to the CME FedWatch tool. The central bank's benchmark overnight interest rate currently sits within a range of 3.50% to 3.75%.

Analysts at Chaos Qin Tianfeng Futures noted that the annual PPI rate for August came in at 5.4%, marginally exceeding expectations. Combined with a sharp surge in oil prices, the market has begun directly pricing in an energy-driven rebound in inflation. Following the data release, U.S. Treasury yields moved broadly higher across the curve, with the 30-year yield spiking to 5.3381%—a level not seen since 2007—prompting a rapid upward revision in market expectations for further Fed tightening.

The combination of higher yields and a firmer inflation narrative has pressured gold-related instruments, as investors weigh the implications of a more aggressive monetary policy stance against the backdrop of rising energy costs.