Japan’s Nikkei index hovered near its all-time high on Thursday, supported by a more than 13% surge in the heavyweight SoftBank Group’s stock on the index.

The stock of robotics manufacturer Yaskawa Electric also jumped 10.5%, with both stocks significantly outperforming all others on the index.

The Nikkei index rose 1.6% to 48,481.09, slightly below its all-time high of 48,527.33 recorded on Tuesday, before entering a midday break at 48,405.93.

SoftBank’s stock alone added 506 points to the Nikkei’s 671-point gain.

The broader Topix index increased 0.3% to 3,244.15 points.

Late in trading on Wednesday, SoftBank Group announced it had acquired the robotics business of Swiss company ABB, signaling the group’s strategic move to combine robotics and artificial intelligence in its investments in startups.