The loss is nearly double the 210 billion yen ($2.63 billion) the company had projected in August, the Japanese daily said.
Sharp, which has been hit by a steep decline in demand for LCD televisions and panels in recent times, had projected a 250 billion yen ($3.13 billion) group net loss for the full year. It may have to widen this projection on account of the worse-than-expected half-year results, the daily said.
The company, which reported an interim net loss of 39.8 billion yen ($499 million) last year, decided to cut 10,000 jobs in September to secure loans, the financial daily said.
Sharp is looking to generate an operating profit in the October-March half and return to the black in the full year through March 2014, the Nikkei reported.
($1 = 79.8250 Japanese yen)
(Reporting by Avik Das in Bangalore; Editing by Roshni Menon)