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Seagate Technology Holdings

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Seagate Technology Holdings insider trading

Seagate Technology Holdings files with the SEC as a Computer Storage Devices company headquartered in Singapore, U0. Every time one of its executives or directors buys or sells the stock, the filing appears here the moment it reaches the SEC — with grants and option exercises set apart from the trades that cost the insider their own money.

From SEC filings

Recent STX insider transactions

3 insiders traded STX on the open market on Sep 15, 2026 — 24 sales worth $153.1M, of which 22 were pre-scheduled under a 10b5-1 plan.

Bought
—
Sold
$153.1M

22 of 24 on a 10b5-1 plan

Net
−$153.1M
Insiders
3

Open-market purchases (code P) and sales (code S) from Seagate Technology Holdings's own SEC Form 4 filings. Grants and option exercises are excluded — they are compensation, not decisions. Share counts are derived from the reported value and price. Verify any figure against the original filing before acting on it; this is monitoring, not advice.

Filing history last read from EDGAR on Sep 18, 2026. The live dashboard shows new filings the moment they clear.

Every STX Form 4 on SEC.gov

SEC Form 4 data, Q3 2024 to Q2 2026

STX insider trading by quarter

Between Jul 01, 2024 and Jun 30, 2026, 13 insiders traded STX on the open market: 0 purchases and 429 sales worth $302M, 398 of the sales pre-scheduled under a 10b5-1 plan. In the last four quarters alone: 0 purchases and 353 sales ($210M), by 11 insiders.

QuarterBoughtSold
Q2 2026—−$107.2M175 sales · 164 on a plan
Q1 2026—−$44.9M58 sales · 52 on a plan
Q4 2025—−$40.9M83 sales · 78 on a plan
Q3 2025—−$17.1M37 sales · 34 on a plan
Q2 2025—−$46.6M28 sales · 24 on a plan
Q1 2025—−$5.7M10 sales · all on a plan
Q4 2024—−$14.8M19 sales · 17 on a plan
Q3 2024—−$24.9M19 sales · all on a plan
Largest sale
−$15.6M of STX by Mosley William D (Chief Executive Officer · Director) on Sep 26, 2024, under a 10b5-1 plan.

Open-market transactions through Jun 30, 2026most recent first

  • Mosley William D

    CEO · Director

    −$1.6M

    Jun 12, 2026

    1,768 sh · $880.19

  • Teh Ban Seng10b5-1

    EVP & Chief Commercial Officer

    −$870.5K

    Jun 12, 2026

    989 sh · $880.19

  • Romano Gianluca

    EVP & CFO

    −$795K

    Jun 12, 2026

    903 sh · $880.19

  • Morris John Christopher10b5-1

    EVP & CTO

    −$790.4K

    Jun 12, 2026

    898 sh · $880.19

  • Morris John Christopher10b5-1

    EVP & CTO

    −$410.2K

    Jun 12, 2026

    466 sh · $880.19

  • Mosley William D

    CEO · Director

    −$1.3M

    Jun 10, 2026

    1,537 sh · $821.74

  • Mosley William D

    CEO · Director

    −$1.1M

    Jun 10, 2026

    1,318 sh · $821.75

  • Romano Gianluca

    EVP & CFO

    −$679.6K

    Jun 10, 2026

    827 sh · $821.77

  • Teh Ban Seng10b5-1

    EVP & Chief Commercial Officer

    −$544.9K

    Jun 10, 2026

    663 sh · $821.86

  • Romano Gianluca

    EVP & CFO

    −$430.2K

    Jun 10, 2026

    524 sh · $821.73

  • Morris John Christopher

    EVP & CTO

    −$262.7K

    Jun 10, 2026

    320 sh · $821.65

  • Morris John Christopher

    EVP & CTO

    −$208.7K

    Jun 10, 2026

    254 sh · $821.66

  • Arumugavelu Shankar

    Director

    −$927.7K

    Jun 04, 2026

    1,000 sh · $927.68

  • Bhatt Prat10b5-1

    Director

    −$929.9K

    Jun 02, 2026

    1,000 sh · $929.88

  • Mosley William D10b5-1

    CEO · Director

    −$1.7M

    Jun 01, 2026

    1,807 sh · $921.75

From SEC's quarterly Form 3, 4 and 5 data sets: code P purchases and code S sales of common stock, by the date the trade happened. Where a fund and the people who control it each report the same block, it is counted once. Trades made in the last days of Q2 2026 but filed after it closed arrive with SEC's next quarterly release.

Seagate Technology Holdings company record

SEC industry classification
Computer Storage Devices
Headquarters
Singapore, U0
Listed on
Nasdaq
SEC Central Index Key
0001137789
Previously filed as
Seagate Technology plc

Sourced from this company's own SEC submissions record. The industry label is SEC's Standard Industrial Classification, which is more specific than the Technology sector shown above.

After insiders bought STX

What the stock actually did in the 90 days following each open-market purchase

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Track STX on the live dashboardFilings on SEC.gov

The live dashboard is free to open. Alerts, watchlists, full filing history and each mover's benchmark-measured track record are Pro. Monitoring, not advice.

How to read STX insider activity

Open-market purchase (code P)
An insider spending their own money at market price. This is the only buy code that reliably carries signal — it is a decision, not compensation.
Grants and option exercises (codes A, M)
Scheduled compensation. Most "insider buying" headlines are really this, which is why InsiderPulse weights it at a fraction of a real purchase.
Cluster buy
Two or more different insiders buying on the open market in the same window. One executive buying can mean anything; three is much harder to explain away.

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This week on the tape: who actually chose to sellThe weekly split of scheduled 10b5-1 selling vs deliberate sales, with the deciders named.

Questions

Are STX insiders buying or selling?
Between Sep 15, 2026 and Sep 15, 2026, 3 Seagate Technology Holdings insiders made no open-market purchases and 24 sales worth $153.1M, a net sale of $153.1M. 22 of the sales were pre-scheduled under a Rule 10b5-1 plan.
How much STX stock have insiders bought and sold in the last two years?
Between Jul 01, 2024 and Jun 30, 2026, 13 Seagate Technology Holdings insiders made no open-market purchases and 429 sales worth $302M. 398 of the sales were pre-scheduled under a Rule 10b5-1 plan. In the four quarters to Jun 30, 2026: no purchases and 353 sales ($210M). The largest sale was Mosley William D selling $15.6M on Sep 26, 2024.
What was the largest recent STX insider trade?
Mosley William D (CEO · Director) sold $75.6M of STX stock on Sep 15, 2026 at about $772.14 a share.
When did an insider last buy STX shares?
No open-market purchase by a Seagate Technology Holdings insider appears in the filings from Sep 15, 2026 to Sep 15, 2026 — every recorded open-market transaction in that period was a sale.
Where does STX insider trading data come from?
From the Form 4 filings Seagate Technology Holdings's officers, directors and 10% owners must send the SEC within two business days of a trade. Each row on this page links to its original filing on SEC EDGAR. Share grants and option exercises are kept apart from open-market purchases and sales, because only the latter cost the insider their own money.

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