Japan's Nikkei share average rose 1 percent on Wednesday, soaring past its 25-day average after market participants said a large program trade boosted the benchmark in the afternoon.

Electrical wire makers soared as investors hunted for smaller cap stocks, analysts said.

The Nikkei .N225 gained 1 percent to 8,550.58 in a rise that traders attributed to technical short-covering after stop-losses on Nikkei futures were triggered.

The broader Topix .TOPX climbed 0.5 percent to 734.98.