In a separate statement, Denso said it would buy back some 125 million shares, as it looks to offset the market impact of the sale. The other sellers are sister companies Toyota Industries and Aisin, Denso said.
Denso shares closed up 0.9% on Wednesday, having lost 4.9% a day earlier after Reuters first reported the news.
Toyota, the world's top-selling automaker, is looking to cash in on stakes in affiliates as it ramps up development and production of fully electric vehicles.
Japanese companies traditionally took stakes in affiliates and business partners - a practice known as cross-shareholding - but have been under pressure to unwind those holdings to improve their use of capital.
($1 = 147.2400 yen)
(Reporting by Tokyo Newsroom; editing by David Dolan)