TOKYO (Reuters) - Apple Inc is considering teaming up with its supplier Foxconn to bid for Toshiba Corp's semiconductor business, public broadcaster NHK said on Friday - the latest twist in the sale of the world's second-biggest flash memory chipmaker.
The U.S. technology giant is considering investing at least several billion dollars to take a stake of more than 20 percent in a plan that would have Toshiba maintain a partial holding to keep the business under U.S. and Japanese control, NHK reported, citing unidentified sources.
The proposal is aimed at allaying the Japanese government's concerns over any transfer of sensitive technology to investors it deems a risk to national security, it said.
Foxconn, which participated in the first round of the auction, has been considered such a risk due to its deep ties with China. The bulk of Apple's iPhones are manufactured at Foxconn's extensive manufacturing base there.
NHK said Apple wants the Taiwan firm to own a stake of around 30 percent of Toshiba's chip business.
Apple was not immediately available to comment. Foxconn, formally known as Hon Hai Precision Industry, declined to comment.
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An investment by Apple would be its first direct stake in a major global memory chipmaker as it seeks to secure a stable supply of key components. Samsung is the biggest maker of flash memory chips, followed by Toshiba, SK Hynix, and U.S.-based Micron Technology Inc.
The report comes as Western Digital Corp, Toshiba's partner and one of the bidders of its chip business, warned this week that the Japanese firm is violating a joint venture contract in plans to sell to its chip unit, and urged that it be given exclusive negotiating rights.
The auction of the prized asset is essential to Toshiba's plans to cover multi-billion writedowns at U.S. nuclear unit Westinghouse that have plunged it into crisis.
Toshiba has narrowed down the field of bidders for its chip unit to four suitors, sources have also said.
They are U.S. chipmaker Broadcom Ltd, which has partnered with private equity firm Silver Lake Partners LP; South Korea's SK Hynix; Foxconn, the world's largest contract electronics maker, and Western Digital.
Broadcom has put in the highest first-round offer of 2.5 trillion yen ($23 billion), while Foxconn offered 2 trillion yen, a person briefed on the matter told Reuters this week.
Apple was not part of any of those four bids, according to the person. It is unclear whether it participated in the first round of the auction that sources have said drew around 10 offers.
Shares in Toshiba fell 5 percent on Friday, hit by a Bloomberg report that the chip business sale had been temporarily put on hold to address the concerns raised by Western Digital, which Toshiba denied.
"It is not true Toshiba has put the chip sale process on hold," a Toshiba spokesman said.
($1 = 109.1300 yen)($1 = 109.1800 yen)
(Reporting by Makiko Yamazaki, Junko Fujita, Tim Kelly and Chang-Ran Kim; Additional reporting by Jessica Macy Yu in Taipei; Editing by Edwina Gibbs)