On October 2, Seagate Technology PLC fell 13.7% in regular trading, trading at $803.2/share, with turnover of $1.429 billion. The sharp decline was primarily triggered by reports that Toshiba plans to invest 60 billion yen to double its HDD supply capacity.

The news sparked immediate concerns that a massive expansion in mechanical hard drive supply could disrupt the existing supply-demand balance in the HDD industry, undermining pricing power for incumbent players. Both Seagate Technology PLC and Western Digital, the two dominant U.S.-listed HDD makers, had already plunged in pre-market trading on the news, with Western Digital falling over 9% in sympathy.

Adding to the pressure, multiple Seagate executives have conducted significant share sales in recent weeks. CEO William Mosley sold approximately 97,889 shares, CFO Gianluca Romano reduced holdings by nearly 50,000 shares, and EVP Teh Ban Seng sold 28,350 shares — all in mid-September. The concentrated insider selling has weighed on market sentiment. Meanwhile, rising U.S. Treasury yields and hawkish Federal Reserve signals have broadly pressured technology growth stocks, with the storage sector bearing the brunt.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)