Concern over billionaire Masayoshi Son's debt load at SoftBank Group Inc. has been reported to grow higher. Sprint Corp., the SoftBank subsidiary in the US is struggling to turn around due to volatility in global markets.

SoftBank's default debt insuring cost has risen by 95 basis points this year to 350 basis points on February 8. The increase is four times compared to the Markit iTraxx Japan credit-default swap index that puts SoftBank near its five-year high of 360 basis points, according to a report published in Bloomberg.

Stock market analysts have updated their consensus ratings on shares of SoftBank Corp recently. Seven analysts have rated 'buy', ten analysts 'outperform', four analysts 'hold' while one opted for 'underperform' reports Risers And Fallers.

The stock of SoftBank Corp. (Japan) has decreased 2.19% or $0.47 to hit $21.04 during the last trading session on February 8. The stock rate slashing has taken place ahead of releasing earning figures.

Around 152,531 shares have been traded on that day. The share price has declined 27.60% since July 2, 2015 and still continues to fall downward. The stock has underperformed by 18.3% against assumptions of S&P500, reports Wallstreet.