The loss of 4.8 billion yen ($35.6 million), its first quarterly loss in two years, compares with a profit of 14.5 billion yen a year earlier and a consensus estimate of a 19.4 billion yen profit from four analysts polled by Refinitiv.
Higher material and logistics costs pushed down its operating earnings by 9.4 billion yen, while a chip shortage had a negative impact of about 3 billion yen, the company said.
But the scandal-laden Japanese industrial conglomerate, which is exploring going private and other options, maintained its profit forecast for the year ending March at 170 billion yen, up 7% from the previous year.
Bain Capital, CVC Capital Partners and Brookfield Asset Management as well as a consortium involving state-backed Japan Investment Corp and private equity firm Japan Industrial Partners have been selected by Toshiba to proceed to a second bidding round.
A buyout of Toshiba could value the firm at as much as $22 billion, sources have previously told Reuters.
Tensions between Toshiba and its activist investors culminated last year when a shareholder-commissioned investigation concluded management had colluded with Japan's trade ministry - which sees the company's nuclear and defence technology as a strategic asset - to block overseas investors from gaining influence at its 2020 shareholder meeting.
This year, shareholders rejected management-backed plans to split the company in two, prompting Toshiba to restart a strategic review.
($1 = 134.98 yen)
(Reporting by Makiko Yamazaki; Editing by Edwina Gibbs)