Some of China's biggest e-commerce sites are already hurting badly from a new US rule

Shares of Alibaba — which operates AliExpress — slumped 5.1% successful after-hours commercialized successful the US. Its Hong Kong-listed banal was down 5% by 11:15 a.m. section time.

Shares of JD.com successful Hong Kong tumbled 4.7%.

Trump's bid ends de minimis tariff exemptions for packages up to $800 from China and Hong Kong connected May 2. The removal of the de minimis regularisation is simply a stroke to Chinese e-commerce companies that person thrived connected shipping low-value packages straight to US consumers.

The White House said Trump is targeting "deceptive shipping practices by Chinese-based shippers, galore of whom fell illicit substances, including synthetic opioids, successful low-value packages to exploit the de minimis exemption."

There were 1.36 cardinal de minimis shipments into the US past year, according to the US Customs and Border Protection bureau — up from 139 cardinal successful 2015.

But e-commerce giants Shein and Temu person already started preparing for the extremity of de minimis shipments by fulfilling much of their orders successful the US.

E-commerce experts told Business Insider successful February that the companies' large vantage comes from ultra-low pricing.

Read the archetypal nonfiction connected Business Insider