Mainland China stocks opened sharply lower Wednesday and were poised to snap a 10-day winning streak after officials failed to inspire confidence in stimulus plans intended to revive the economy.

China is back to work after the fall "Golden Week" holiday, and the sheen is coming off a recent market rally. A briefing from the country's top economic planner, the National Development and Reform Commission,

Notably, a gauge of Chinese stocks listed in Hong Kong dropped as much as 11% earlier, the biggest one-day fall in nearly 16 years. Keep an eye on the stocks that have benefited the most from the rally in China -- miners like Rio Tinto and Glencore, financials like Prudential and HSBC, and luxury goods names like Burberry.