Uncertainty about the outcome of the race has weighed on share prices in recent weeks.
A dual listing in Shanghai and Hong Kong was postponed one day after Chinese regulators summoned Jack Ma and other executives of the financial technology giant.
As attorney general for six years, Kamala Harris took a moderate, realpolitik approach to going after big business, aides say.
The biggest stock market listing to date is halted after the process is suspended in Shanghai.
A Hertfordshire company is alleging fraud by its supplier based in the British Virgin Islands.