(Yicai Global) June 30 -- China's mainland stock markets strengthened in the morning session after a high opening, with the Nasdaq-style tech board in Shenzhen recovering to an over four-year high at the half break.

The ChiNext Price Index, which tracks growth enterprises in Shenzhen, rose 2.66 percent to 2,435.55 to mount to a new apex since Jan. 6, 2016. The Shenzhen Component Index was at 11,975.93, up 1.9 percent, also breaking through to a four-year zenith. The

Shanghai Composite Index closed 0.58 percent higher at 2,978.56.

The consumer electronics sector contributed the most to the boost, led by Shandong province-based earphone developer Goertek [SHE:002241], which soared 10 percent to CNY29.37 (USD4.15). Guangdong province-based speaker maker Hiviacoustics

Technology [SHE:002888] also shot to the 10 percent limit up to stop trading at CNY22.28.

Editor: Ben Armour