Photo/IllutrationSatoshi Tsunakawa, president of Toshiba Corp., at a news conference in Tokyo on June 23 (Asahi Shimbun file photo)

An auditing company plans to withhold its opinion about Toshiba Corp.’s financial statements for fiscal 2016, raising the likelihood that the electronics giant will be delisted from the Tokyo Stock Exchange.

PricewaterhouseCoopers Aarata (PwC Aarata) has no idea when it will be able to complete its investigation into when Toshiba became aware of the huge losses at its U.S. nuclear business, sources said.

The auditor had withheld its opinion about Toshiba’s financial statements for the October-December period of fiscal 2016.

In late 2016, Toshiba announced enormous losses at its U.S. nuclear arm. However, PwC Aarata suspects that the electronics giant became aware of the losses much earlier, the sources said.

According to the sources, PwC Aarata’s partner, PricewaterhouseCoopers USA, which is in charge of auditing Toshiba’s U.S. nuclear subsidiary Westinghouse Electric Co., is maintaining a cautious stance and has called on PwC Aarata to continue its investigation.

PwC Aarata has informed not only Toshiba but also the Financial Services Agency that it will not give its opinion about the company’s financial statements for the full business year that ended in March 2017.

Unaudited financial statements are usually submitted when auditing becomes impossible due to bankruptcies or when necessary documents have been lost in natural disasters.

Unaudited financial statements by big companies like Toshiba are rare.

Toshiba plans to submit its full-year financial statement to the Kanto Local Finance Bureau in August. The bureau will accept the report even if it is unaudited.