Seagate Falls 9% as Toshiba Bidding War for TDK Magnetic-Heads Unit Rattles Hard-Drive Sector

Seagate Technology Holdings and Toshiba are competing to acquire TDK Corp.'s magnetic-heads business for hard-disk drives, in a deal that could be worth several billion dollars, according to Bloomberg. The contest pits two major HDD players against each other for control of a critical component supply chain as AI-driven data-center storage demand surges. TDK is pursuing the sale as it shifts investment toward higher-growth segments including batteries, passive components, and sensors. Toshiba initiated talks with TDK in the spring, with Seagate reportedly entering the race with a higher bid.

Toshiba later denied a specific report characterizing the process as a takeover battle, though the broader competitive dynamic between the two suitors remained in focus for investors. Evercore noted that vertical integration into magnetic-heads production would favor Seagate and Western Digital, underlining the strategic logic behind Seagate's pursuit. Goldman Sachs also commented on the competitive dynamic between Toshiba and Seagate around the TDK unit.

The news hit the entire HDD sector hard. Seagate shares fell roughly 9% on the day, while Western Digital dropped approximately 6%, as investors weighed Toshiba's ambitions as a newly energized competitor in AI storage against the acquisition cost risk for whoever wins the TDK unit. Micron held roughly flat. Analysts at Barron's framed the development as a dual threat for Seagate: the prospect of a more aggressive Toshiba in the market and the financial burden of a multi-billion-dollar deal.