(Yicai Global) Oct. 31 -- China's stock markets saw a mixed opening in early trading on Tuesday. The benchmark Shanghai Composite Index remains under selling pressure, while the Growth Enterprise Index, mostly comprising small-cap companies, saw a slight rebound following Monday's sell-off.

At 9.55 a.m., the Shanghai Composite Index was down 0.30 percent at 3,380.016 points after opening 0.28 percent lower.

The Shenzhen Component Index down 0.10 percent to 11,302.36 points after opening 0.17 percent lower.

The Growth Enterprise Index rebounded from Monday's sell-off,  up 0.41 percent to 1,863.67 points after a flat opening.

China's State Statistical Bureau released official PMI data before Tuesday's market opening. The index registered 51.6, the lowest point seen in the last 3 months and slightly lower than the market average expectation of 52.0, though still well above the boom-bust boundary line of 50.