Seagate Shares Sink as Toshiba Expansion Plan Raises HDD Supply Concerns

Seagate Technology Holdings plc (STX) is down 11.6% today. Here is some analysis on what might have caused this price movement.

Analysis: The most likely catalyst is investor concern that a planned industry capacity expansion could weaken the tight supply conditions that have supported Seagate’s pricing and margins. The selloff appears tied to fears that more hard disk drive output for AI data centers could eventually increase competition and pressure profitability across the sector.

Details:

Toshiba’s HDD manufacturing operation in the Philippines said it aims to nearly double annual production capacity by fiscal 2027 versus fiscal 2025 on a storage-capacity basis.

Market attention centered on the possibility that higher future HDD supply could reduce the favorable pricing environment Seagate has benefited from as data-center demand accelerated.

Seagate’s latest annual results showed very strong profitability, including revenue of $3.6 billion in its fiscal fourth quarter and non-GAAP gross margin above 52%, which can make the stock more sensitive to any threat to margin expectations.

With Seagate’s next earnings date still ahead later this month, investors appear to be repricing the shares before management has a chance to address whether added industry capacity changes its outlook.

Sources:

Seagate Investor Relations, PR Newswire APAC, Yahoo Finance

Disclaimer: This price movement analysis was generated with the help of AI. Please double-check the information provided for mistakes.

$STX Insider Trading Activity

$STX insiders have traded $STX stock on the open market 501 times in the past 6 months. Of those trades, 0 have been purchases and 501 have been sales.

Here’s a breakdown of recent trading of $STX stock by insiders over the last 6 months:

WILLIAM D MOSLEY (CEO) has made 0 purchases and 196 sales selling 275,369 shares for an estimated $225,140,405.
GIANLUCA ROMANO (EVP & CFO) has made 0 purchases and 113 sales selling 136,325 shares for an estimated $109,978,079.
BAN SENG TEH (EVP & Chief Commercial Officer) has made 0 purchases and 98 sales selling 94,202 shares for an estimated $76,426,540.
JOHN CHRISTOPHER MORRIS (EVP & CTO) has made 0 purchases and 53 sales selling 37,654 shares for an estimated $30,418,335.
JAMES CI LEE (EVP & CLO) has made 0 purchases and 35 sales selling 14,885 shares for an estimated $12,125,608.
YOLANDA LEE CONYERS has made 0 purchases and 2 sales selling 1,500 shares for an estimated $1,275,330.
STEPHANIE TILENIUS has made 0 purchases and 2 sales selling 1,580 shares for an estimated $1,211,249.
PRAT BHATT sold 1,000 shares for an estimated $929,880
SHANKAR ARUMUGAVELU sold 1,000 shares for an estimated $927,680

To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API insider transaction endpoint.

$STX Hedge Fund Activity

We have seen 1,142 institutional investors add shares of $STX stock to their portfolio, and 649 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

SANDERS CAPITAL, LLC removed 9,409,982 shares (-73.0%) from their portfolio in Q2 2026, for an estimated $9,080,632,630
JPMORGAN CHASE & CO added 5,201,103 shares (+inf%) to their portfolio in Q2 2026, for an estimated $5,019,064,395
INVESCO LTD. added 4,937,030 shares (+189.9%) to their portfolio in Q2 2026, for an estimated $4,764,233,950
WELLINGTON MANAGEMENT GROUP LLP added 2,326,538 shares (+2655.9%) to their portfolio in Q2 2026, for an estimated $2,245,109,170
NOMURA ASSET MANAGEMENT INTERNATIONAL INC. removed 1,798,886 shares (-99.7%) from their portfolio in Q2 2026, for an estimated $1,735,924,990
FRANKLIN RESOURCES INC removed 1,720,116 shares (-48.9%) from their portfolio in Q2 2026, for an estimated $1,659,911,940
DZ BANK AG DEUTSCHE ZENTRAL GENOSSENSCHAFTS BANK, FRANKFURT AM MAIN removed 1,511,670 shares (-41.8%) from their portfolio in Q2 2026, for an estimated $1,458,761,550

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API 13F endpoint.

$STX Congressional Stock Trading

Members of Congress have traded $STX stock 1 times in the past 6 months. Of those trades, 0 have been purchases and 1 have been sales.

Here’s a breakdown of recent trading of $STX stock by members of Congress over the last 6 months:

REPRESENTATIVE KEVIN HERN sold up to $15,000 on 09/15.

To track congressional stock trading, check out Quiver Quantitative's congressional trading dashboard. You can access data on congressional stock trades through the Quiver Quantitative API Congress trades endpoint.

$STX Analyst Ratings

Wall Street analysts have issued reports on $STX in the last several months. We have seen 2 firms issue buy ratings on the stock, and 0 firms issue sell ratings.

Here are some recent analyst ratings:

Barclays issued a "Overweight" rating on 04/30/2026
TD Cowen issued a "Buy" rating on 04/29/2026

To track analyst ratings and price targets for $STX, check out Quiver Quantitative's $STX forecast page.

$STX Price Targets

Multiple analysts have issued price targets for $STX recently. We have seen 14 analysts offer price targets for $STX in the last 6 months, with a median target of $1000.0.

Here are some recent targets:

Mehdi Hosseini from Susquehanna set a target price of $775.0 on 07/08/2026
Wamsi Mohan from B of A Securities set a target price of $1150.0 on 07/01/2026
C.J. Muse from Cantor Fitzgerald set a target price of $1300.0 on 06/29/2026
Erik Woodring from Morgan Stanley set a target price of $1035.0 on 06/15/2026
Samik Chatterjee from JP Morgan set a target price of $920.0 on 06/12/2026
Vijay Rakesh from Mizuho set a target price of $1090.0 on 06/08/2026
Asiya Merchant from Citigroup set a target price of $1150.0 on 06/02/2026

This article is not financial advice. See Quiver Quantitative's disclaimers for more information. Note that there may be inaccuracies due to mistakes in ticker-mapping, and other anomalies.