Seagate reportedly bids billions for TDK's drive-head unit, outbidding Toshiba, which cannot build without it

The bid answers the report that cost Seagate 10%

Seagate has reportedly outbid↗ Toshiba for TDK's magnetic-head business in a deal that people familiar with the matter put at several billion dollars ¹. Toshiba opened talks in the spring; Seagate returned with a higher offer over the summer ¹. TDK closed 5.25% higher in Tokyo, and Seagate finished Monday at $887.09, up 4.49% ¹⁷.

Friday's Toshiba capacity report↗, which The Inference covered on October 3, knocked 10.2% off Seagate and 12% off Western Digital ¹⁵.

Three customers, one independent supplier

TDK is the only independent maker of the heads that write to and read from a drive's platters ¹⁴. Seagate and Western Digital build heads in-house and turn to TDK when demand spikes; Toshiba buys every head from TDK, and its plan to mass-produce HAMR drives leans on TDK's technology ¹⁴.

Citi analyst Asiya Merchant argued Toshiba's $380 million plan to double capacity by fiscal 2027 stays capped unless outside suppliers of heads and media expand too ⁵⁶. TrendForce projects Western Digital at 48% of the 2026 drive market, Seagate at 42%, Toshiba at 10%↗ ⁴.

A 223% year has priced the scarcity

Seagate is up more than 223% this year and sits about 22% below its June 18 record ¹. The numbers behind the move: revenue of $3.629 billion last quarter, up 48.5% year over year, an operating margin of 43%, and 2026 output sold out under agreements running into 2027 and 2028 ⁶⁸.

A several-billion-dollar check strains a balance sheet holding $1.704 billion of cash against $3.565 billion of debt↗ ⁸; Seagate's last two storage deals, Intevac and Xyratex, cost $119 million and $376 million ¹. Western Digital, the third customer, has $527 million of net cash, a $441.76 stock and no bid on the table ².

Toshiba denies the auction exists

A Toshiba spokesperson called the report inconsistent with the company's understanding↗; Japan Industrial Partners, its main backer, said the same, and Toshiba denied any three-way talks on future head supplies ³. No agreement is confirmed by any of the three companies ³.

The report itself anticipates close antitrust scrutiny of any sale ⁴, and LYNX Equity Strategies reads Toshiba's investment as protection against a domestic shortage rather than a share grab ⁵.

What TDK's choice decides

TDK is weighing an exit to fund batteries, sensors and passive components; its magnetic-application segment returns 4% on invested capital, the group's lowest ⁴.

If Seagate wins the unit, Toshiba's doubling runs through a part owned by the competitor whose capacity report just repriced its stock, and Western Digital's swing supply would come from that same rival ¹⁴. If Toshiba wins, Seagate and Western Digital buy their swing supply from a unit their competitor owns ⁴.

Watch TDK's pick, Toshiba's next statement and the antitrust review the report already anticipates ³⁴. Toshiba can build the plants; the heads decide whether they run.