Video game maker Nintendo Co. Ltd's shares are up over 7% to a high of 13,850 yen in early Thursday trading, after announcing it plans on buying back 125 billion yen of its outstanding shares. In a note Goldman Sachs said," While the market may react we are more cautious," and "The buyback will boost net profits per share by 8.2 percent, but reduce cash and marketable securities per share by 5.8 percent." Nintendo is due to reveal a new management strategy on Thursday due to pressure from investors want to see a return after being warned the company could post another year of operating losses.