The move comes before President Trump’s planned imposition of new tariffs on small packages sent to the United States from Hong Kong and China.

Nineteen global law firms had closed their Hong Kong practices by 2023. FedEx opted to ship its regional headquarters to expat-friendlier Singapore. So did other multinationals, from L’Oréal, a French maker of posh cosmetics, to Lidl, a German cut-price retailer. LVMH started running its luxury labels from the mainland.

Hong Kong announced Wednesday that its postal service would no longer send packages to the United States, in response to the White House’s plan to charge tariffs on small, low-value parcels from the city.