The Nikkei Average extended its gains, closing the morning session at 65883.41, up 864.46 points. Advantest added approximately 316 points to the Nikkei Average toward the close, while advancing issues supported the index.
The Nikkei Average stood at 65883.41 at the end of the morning session, up 864.46 points from the previous day. Estimated trading volume was approximately 1.17754 billion shares, with buying leading at times in response to moves in the U.S. market.
By issue, 115 advanced, 105 declined and 5 were unchanged. Semiconductor-related and electronic component stocks were bought, widening the index's gains.
Advantest was the top contributor among advancing issues, adding approximately 316 points to the Nikkei Average on its own. Ibiden, Tokyo Electron, TDK, Fast Retailing and SoftBank Group also contributed.
On the downside, Recruit Holdings was the top detractor, lowering the index by approximately 79 points. Tokio Marine Holdings, ITOCHU, Toyota Motor, Mitsubishi Corporation and COMSYS Holdings also declined.
As of 11:30, the Nikkei Average stood at 65883.41, with aggregate contribution positive. Gains and declines by individual issues were driving the index's movement.