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Seagate Technology Holdings stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+66.6% to $460.99
Seagate Technology Holdings (STX) stock rose 67% over the last 252 sessions, to $460.99. On the way it reported 0 quarters, its insiders filed 26 open-market trades and 25 Form 144 notices of planned sales, and the company filed 2 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 23, 2026 | Form 144 | Form 144: James CI Lee plans to sell $380K | −1.8% (−1.3% vs SPY) | +8.7% (+8.0% vs SPY) | — |
| Oct 23, 2026 | Insider sale | Lee James CI sold $351K | −1.8% (−1.3% vs SPY) | +8.7% (+8.0% vs SPY) | — |
| Sep 21, 2026 | Form 144 | Form 144: John C Morris plans to sell $12.8M | +2.1% (+0.6% vs SPY) | +6.6% (+5.4% vs SPY) | −26.1% (−26.7% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: William D. Mosley plans to sell $79.4M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: Gianluca Romano plans to sell $40.5M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: Ban Seng Teh plans to sell $41.2M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: John Christopher Morris plans to sell $12.5M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 15, 2026 | Insider sale | Romano Gianluca sold $38.6M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 15, 2026 | Insider sale | Morris John Christopher sold $11.9M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 15, 2026 | Insider sale | Mosley William D sold $75.6M | −4.3% (−3.8% vs SPY) | +8.5% (+6.6% vs SPY) | −7.4% (−9.9% vs SPY) |
| Sep 14, 2026 | Form 144 | Form 144: William D. Mosley plans to sell $1.5M | −3.0% (−2.6% vs SPY) | +3.4% (+3.5% vs SPY) | −9.6% (−11.7% vs SPY) |
| Sep 14, 2026 | Form 144 | Form 144: Gianluca Romano plans to sell $783K | −3.0% (−2.6% vs SPY) | +3.4% (+3.5% vs SPY) | −9.6% (−11.7% vs SPY) |
| Sep 14, 2026 | Form 144 | Form 144: Ban Seng Teh plans to sell $770K | −3.0% (−2.6% vs SPY) | +3.4% (+3.5% vs SPY) | −9.6% (−11.7% vs SPY) |
| Sep 14, 2026 | Form 144 | Form 144: John Christopher Morris plans to sell $404K | −3.0% (−2.6% vs SPY) | +3.4% (+3.5% vs SPY) | −9.6% (−11.7% vs SPY) |
| Sep 14, 2026 | Insider sale | Morris John Christopher sold $385K | −3.0% (−2.6% vs SPY) | +3.4% (+3.5% vs SPY) | −9.6% (−11.7% vs SPY) |
| Sep 14, 2026 | Insider sale | Mosley William D sold $1.5M | −3.0% (−2.6% vs SPY) | +3.4% (+3.5% vs SPY) | −9.6% (−11.7% vs SPY) |
| Sep 11, 2026 | Form 144 | Form 144: Gianluca Romano plans to sell $43.5M | −3.8% (−4.7% vs SPY) | −7.1% (−7.7% vs SPY) | −9.6% (−12.5% vs SPY) |
| Sep 10, 2026 | Form 144 | Form 144: William D. Mosley plans to sell $2.6M | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 10, 2026 | Form 144 | Form 144: Gianluca Romano plans to sell $1.2M | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 10, 2026 | Form 144 | Form 144: Ban Seng Teh plans to sell $570K | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 10, 2026 | Form 144 | Form 144: John Christopher Morris plans to sell $518K | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 10, 2026 | Insider sale | Romano Gianluca sold $1.2M | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 10, 2026 | Insider sale | Morris John Christopher sold $493K | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 10, 2026 | Insider sale | Mosley William D sold $2.5M | −2.7% (−2.1% vs SPY) | −12.3% (−11.2% vs SPY) | −13.3% (−15.1% vs SPY) |
| Sep 4, 2026 | 8-K | Directors and officers: departures, appointments, pay | +6.3% (+6.8% vs SPY) | −5.3% (−4.1% vs SPY) | −5.2% (−6.6% vs SPY) |
| Sep 1, 2026 | Form 144 | Form 144: Yolanda Conyers plans to sell $621K | −1.4% (−0.7% vs SPY) | +8.8% (+8.9% vs SPY) | +10.8% (+11.2% vs SPY) |
| Sep 1, 2026 | Form 144 | Form 144: William D. Mosley plans to sell $74.6M | −1.4% (−0.7% vs SPY) | +8.8% (+8.9% vs SPY) | +10.8% (+11.2% vs SPY) |
| Aug 24, 2026 | Form 144 | Form 144: James Lee plans to sell $7.7M | −6.7% (−6.4% vs SPY) | −2.4% (−2.9% vs SPY) | +7.9% (+6.7% vs SPY) |
| Aug 21, 2026 | Form 144 | Form 144: William D. Mosley plans to sell $15.5M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Form 144 | Form 144: Gianluca Romano plans to sell $7.8M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Form 144 | Form 144: James CI Lee plans to sell $3.4M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Form 144 | Form 144: Ban Seng Teh plans to sell $8.4M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Form 144 | Form 144: John Christopher Morris plans to sell $3.0M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Insider sale | Romano Gianluca sold $7.7M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Insider sale | Mosley William D sold $15.4M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 21, 2026 | Insider sale | Lee James CI sold $3.3M | 0.0% (−0.4% vs SPY) | −0.4% (−1.5% vs SPY) | +3.1% (+1.5% vs SPY) |
| Aug 20, 2026 | Form 144 | Form 144: Ban Seng Teh plans to sell $5.1M | +2.1% (+2.9% vs SPY) | +1.6% (+2.0% vs SPY) | +3.1% (+3.8% vs SPY) |
| Aug 20, 2026 | Form 144 | Form 144: John Morris plans to sell $435K | +2.1% (+2.9% vs SPY) | +1.6% (+2.0% vs SPY) | +3.1% (+3.8% vs SPY) |
| Aug 13, 2026 | Insider sale | Teh Ban Seng sold $6.8M | +4.8% (+4.1% vs SPY) | −5.3% (−4.9% vs SPY) | −5.6% (−4.6% vs SPY) |
| Jul 23, 2026 | Insider sale | Lee James CI sold $491K | +0.6% (+1.8% vs SPY) | −17.2% (−14.8% vs SPY) | −6.6% (−8.6% vs SPY) |
| Jun 12, 2026 | Insider sale | Romano Gianluca sold $795K | +7.0% (+6.5% vs SPY) | +20.9% (+19.5% vs SPY) | +1.3% (−0.9% vs SPY) |
| Jun 12, 2026 | Insider sale | Mosley William D sold $1.6M | +7.0% (+6.5% vs SPY) | +20.9% (+19.5% vs SPY) | +1.3% (−0.9% vs SPY) |
| Jun 10, 2026 | Insider sale | Romano Gianluca sold $1.1M | −3.6% (−2.0% vs SPY) | +19.8% (+18.0% vs SPY) | +7.4% (+4.8% vs SPY) |
| Jun 10, 2026 | Insider sale | Morris John Christopher sold $471K | −3.6% (−2.0% vs SPY) | +19.8% (+18.0% vs SPY) | +7.4% (+4.8% vs SPY) |
| Jun 10, 2026 | Insider sale | Mosley William D sold $2.3M | −3.6% (−2.0% vs SPY) | +19.8% (+18.0% vs SPY) | +7.4% (+4.8% vs SPY) |
| Jun 4, 2026 | Insider sale | Arumugavelu Shankar sold $928K | −1.6% (−2.0% vs SPY) | −14.2% (−10.3% vs SPY) | −7.9% (−7.8% vs SPY) |
| May 6, 2026 | 8-K | Directors and officers: departures, appointments, pay | +2.0% (+0.6% vs SPY) | +4.8% (+2.8% vs SPY) | +18.3% (+13.8% vs SPY) |
| May 5, 2026 | Insider sale | Tilenius Stephanie sold $1.2M | +4.3% (+3.5% vs SPY) | +12.2% (+9.2% vs SPY) | +24.2% (+19.3% vs SPY) |
| Mar 19, 2026 | Insider sale | Mosley William D sold $10.0M | +6.6% (+6.9% vs SPY) | +1.7% (+2.2% vs SPY) | +29.9% (+22.5% vs SPY) |
| Feb 23, 2026 | Insider sale | Chong Kian Fatt sold $2.4M | −0.9% (+0.1% vs SPY) | −0.8% (−0.3% vs SPY) | −1.7% (+3.1% vs SPY) |
| Jan 30, 2026 | Insider sale | Geldmacher Jay L sold $414K | −9.1% (−8.8% vs SPY) | −9.7% (−7.3% vs SPY) | −16.3% (−15.2% vs SPY) |
| Jan 29, 2026 | Insider sale | Teh Ban Seng sold $8.9M | +0.8% (+1.0% vs SPY) | −5.6% (−4.3% vs SPY) | −8.3% (−6.9% vs SPY) |
| Nov 10, 2025 | Insider sale | Arumugavelu Shankar sold $1.5M | +5.1% (+3.6% vs SPY) | −7.9% (−8.0% vs SPY) | +1.3% (−0.5% vs SPY) |
Insiders’ record here
In the year on the chart, Seagate Technology Holdings' insiders reported 0 open-market buys ($0) and 26 sales ($198M). Of the 13 old enough to score, 4 were followed by the stock doing what the trade implied over the next 63 sessions (beating SPY after a buy, lagging it after a sale); the median excess return after a buy was — and after a sale +1.2%.
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Seagate Technology Holdings: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.