Seagate Technology insider activity
What the executives and directors of Seagate Technology actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$564M
net open-market flow, 12 m
0 open-market buys, 12 m
64.2%
of sale value on 10b5-1 plans, 12 m
1,811 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling. The share count changed 1-for-2 on May 4, 2026, so prices and share counts reported before then are restated to today's basis here; otherwise the tape would show a step the shares never took.
The 154 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Sep 14, 2026 | MOSLEY WILLIAM D | 177K |
| Sep 14, 2026 | Romano Gianluca | 90K |
| Sep 14, 2026 | Teh Ban Seng | 53K |
| Sep 14, 2026 | Chong Kian Fatt | 14K |
| Sep 14, 2026 | Morris John Christopher | 30K |
| Sep 11, 2026 | MOSLEY WILLIAM D | 8,549 |
| Sep 11, 2026 | Romano Gianluca | 55K |
| Sep 11, 2026 | Teh Ban Seng | 2,252 |
| Sep 11, 2026 | Chong Kian Fatt | 1,259 |
| Sep 11, 2026 | Morris John Christopher | 2,073 |
| Sep 1, 2026 | MOSLEY WILLIAM D | 14K |
| Aug 24, 2026 | Lee James CI | 4,032 |
| Aug 20, 2026 | MOSLEY WILLIAM D | 34K |
| Aug 20, 2026 | Romano Gianluca | 17K |
| Aug 20, 2026 | Lee James CI | 8,920 |
| Aug 20, 2026 | Teh Ban Seng | 18K |
| Aug 20, 2026 | Chong Kian Fatt | 6,846 |
| Aug 20, 2026 | Morris John Christopher | 7,578 |
| Aug 13, 2026 | Teh Ban Seng | 6,002 |
| Aug 3, 2026 | MOSLEY WILLIAM D | 14K |
| Jul 22, 2026 | Lee James CI | 1,237 |
| Jul 1, 2026 | MOSLEY WILLIAM D | 14K |
| Jun 11, 2026 | MOSLEY WILLIAM D | 8,549 |
| Jun 11, 2026 | Romano Gianluca | 4,169 |
| Jun 11, 2026 | Teh Ban Seng | 2,251 |
| Jun 11, 2026 | Chong Kian Fatt | 1,259 |
| Jun 11, 2026 | Morris John Christopher | 2,072 |
| Jun 1, 2026 | MOSLEY WILLIAM D | 14K |
| May 20, 2026 | MOSLEY WILLIAM D | 14K |
| May 14, 2026 | Teh Ban Seng | 8,003 |
| Apr 22, 2026 | Lee James CI | 889 |
| Mar 11, 2026 | MOSLEY WILLIAM D | 6,410 |
| Mar 11, 2026 | Romano Gianluca | 3,126 |
| Mar 11, 2026 | Teh Ban Seng | 1,126 |
| Mar 11, 2026 | Chong Kian Fatt | 630 |
| Mar 11, 2026 | Morris John Christopher | 1,509 |
| Feb 22, 2026 | Romano Gianluca | 19K |
| Feb 20, 2026 | MOSLEY WILLIAM D | 8,887 |
| Feb 20, 2026 | Teh Ban Seng | 2,953 |
| Feb 20, 2026 | Chong Kian Fatt | 2,214 |
| Feb 20, 2026 | Morris John Christopher | 3,230 |
| Jan 29, 2026 | Teh Ban Seng | 4,717 |
| Jan 22, 2026 | Lee James CI | 901 |
| Jan 12, 2026 | Teh Ban Seng | 706 |
| Dec 11, 2025 | MOSLEY WILLIAM D | 6,436 |
| Dec 11, 2025 | Romano Gianluca | 3,138 |
| Dec 11, 2025 | Teh Ban Seng | 1,831 |
| Dec 11, 2025 | Chong Kian Fatt | 629 |
| Dec 11, 2025 | Morris John Christopher | 1,509 |
| Nov 12, 2025 | Romano Gianluca | 26K |
| Nov 11, 2025 | Teh Ban Seng | 706 |
| Oct 25, 2025 | Szlosek Thomas A | 292 |
| Oct 22, 2025 | Lee James CI | 889 |
| Oct 19, 2025 | BRUNER JUDY | 1,670 |
| Oct 19, 2025 | CANNON MICHAEL R | 2,125 |
| Oct 19, 2025 | CLEMMER RICHARD L | 1,670 |
| Oct 19, 2025 | Adams Mark | 1,670 |
| Oct 19, 2025 | Geldmacher Jay L | 1,670 |
| Oct 19, 2025 | BHATT PRAT | 1,670 |
| Oct 19, 2025 | Tilenius Stephanie | 1,670 |
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price. The share count changed 1-for-2 on May 4, 2026, so share counts reported before then are restated to today's basis here.
The chart, in numbers
| Flow | Shares |
|---|---|
| From holdings | 16K |
| Vested / exercised | 728K |
| Withheld for tax | 22K |
| Planned sales (10b5-1) | 465K |
| Discretionary sales | 256K |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades. The share count changed 1-for-2 on May 4, 2026, so share counts reported before then are restated to today's basis here.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| MOSLEY WILLIAM D | 275K | 378K | 137.3 |
| CLEMMER RICHARD L | 5,926 | 15K | 250.6 |
Who holds what
the 14 largest holdings of 20| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| MOSLEY WILLIAM D CEO Last trade Sep 15, 2026 | CEO | 378K | – | $281M | net selling over the year: 0 months buying, 12 months selling | Sep 15, 2026 |
| Romano Gianluca EVP & CFO Last trade Sep 15, 2026 | CFO | 71K | – | $146M | net selling over the year: 0 months buying, 5 months selling | Sep 15, 2026 |
| ZANDER EDWARD J Last trade Oct 23, 2023 | Director | 45K | – | – | Oct 23, 2023 | |
| Morris John Christopher EVP & CTO Last trade Sep 15, 2026 | Officer | 31K | – | $22M | net selling over the year: 0 months buying, 7 months selling | Sep 15, 2026 |
| CLEMMER RICHARD L | Director | 30K | – | – | – | |
| SCHUELKE KATHERINE SVP, CLO & Corporate Secretary Last trade Dec 9, 2023 | Officer | 29K | – | – | Dec 9, 2023 | |
| Teh Ban Seng EVP & Chief Commercial Officer Last trade Sep 15, 2026 | Officer | 27K | – | $89M | net selling over the year: 0 months buying, 8 months selling | Sep 15, 2026 |
| Chong Kian Fatt EVP Global Operations Last trade Feb 23, 2026 | Officer | 25K | – | $4.4M | net selling over the year: 0 months buying, 2 months selling | Feb 23, 2026 |
| Adams Mark Last trade Dec 10, 2021 | Director | 19K | – | – | Dec 10, 2021 | |
| BRUNER JUDY Last trade May 22, 2025 | Director | 19K | – | – | May 22, 2025 | |
| Haggart Dylan G. | Director | 15K | – | – | – | |
| CANNON MICHAEL R Last trade Jun 2, 2025 | Director | 14K | – | – | Jun 2, 2025 | |
| BHATT PRAT Last trade Jun 2, 2026 | Director | 13K | – | $930K | net selling over the year: 0 months buying, 1 month selling | Jun 2, 2026 |
| Tilenius Stephanie Last trade May 5, 2026 | Director | 11K | – | $1.8M | net selling over the year: 0 months buying, 2 months selling | May 5, 2026 |
Open-market trade log
the 60 most recent of 2,959| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Sep 15, 2026 | MOSLEY WILLIAM D (CEO) 98K shares $772.14 +6.5% since trade filed Sep 16, 2026 | Discretionary sale | 98K | $772.14 | $76M | +6.5% | Sep 16, 2026 |
| Sep 15, 2026 | Romano Gianluca (CFO) 50K shares $772.16 +6.5% since trade filed Sep 16, 2026 | Discretionary sale | 50K | $772.16 | $39M | +6.5% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 120 shares $787.26 +4.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 120 | $787.26 | $94K | +4.4% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 280 shares $788.43 +4.3% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 280 | $788.43 | $221K | +4.3% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 400 shares $799.03 +2.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 400 | $799.03 | $320K | +2.9% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 530 shares $797.97 +3.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 530 | $797.97 | $423K | +3.0% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 560 shares $791.36 +3.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 560 | $791.36 | $443K | +3.9% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 914 shares $771.38 +6.6% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 914 | $771.38 | $705K | +6.6% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,000 shares $784.45 +4.8% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,000 | $784.45 | $784K | +4.8% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,040 shares $786.14 +4.6% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,040 | $786.14 | $818K | +4.6% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,280 shares $794.72 +3.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,280 | $794.72 | $1.0M | +3.4% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,587 shares $796.90 +3.2% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,587 | $796.90 | $1.3M | +3.2% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,600 shares $781.35 +5.2% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,600 | $781.35 | $1.3M | +5.2% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,717 shares $774.01 +6.2% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,717 | $774.01 | $1.3M | +6.2% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,760 shares $783.28 +5.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,760 | $783.28 | $1.4M | +5.0% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 1,760 shares $789.84 +4.1% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,760 | $789.84 | $1.4M | +4.1% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 2,166 shares $795.95 +3.3% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 2,166 | $795.95 | $1.7M | +3.3% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 2,315 shares $775.01 +6.1% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 2,315 | $775.01 | $1.8M | +6.1% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 2,453 shares $780.29 +5.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 2,453 | $780.29 | $1.9M | +5.4% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 2,480 shares $800.47 +2.7% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 2,480 | $800.47 | $2.0M | +2.7% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 3,242 shares $776.20 +5.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 3,242 | $776.20 | $2.5M | +5.9% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 3,451 shares $772.65 +6.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 3,451 | $772.65 | $2.7M | +6.4% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 3,987 shares $777.22 +5.8% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 3,987 | $777.22 | $3.1M | +5.8% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 4,147 shares $782.56 +5.1% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 4,147 | $782.56 | $3.2M | +5.1% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 6,682 shares $779.27 +5.5% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 6,682 | $779.27 | $5.2M | +5.5% | Sep 16, 2026 |
| Sep 15, 2026 | Teh Ban Seng (Officer) 7,259 shares $778.35 +5.6% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 7,259 | $778.35 | $5.7M | +5.6% | Sep 16, 2026 |
| Sep 15, 2026 | Morris John Christopher (Officer) 15K shares $772.15 +6.5% since trade filed Sep 16, 2026 | Discretionary sale | 15K | $772.15 | $12M | +6.5% | Sep 16, 2026 |
| Sep 14, 2026 | MOSLEY WILLIAM D (CEO) 1,870 shares $781.23 +5.2% since trade filed Sep 15, 2026 | Discretionary sale | 1,870 | $781.23 | $1.5M | +5.2% | Sep 15, 2026 |
| Sep 14, 2026 | Romano Gianluca (CFO) 955 shares $781.24 +5.2% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 955 | $781.24 | $746K | +5.2% | Sep 15, 2026 |
| Sep 14, 2026 | Teh Ban Seng (Officer) 989 shares $779.00 +5.5% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 989 | $779.00 | $770K | +5.5% | Sep 15, 2026 |
| Sep 14, 2026 | Morris John Christopher (Officer) 493 shares $781.23 +5.2% since trade filed Sep 15, 2026 | Discretionary sale | 493 | $781.23 | $385K | +5.2% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 80 shares $849.87 −3.3% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 80 | $849.87 | $68K | −3.3% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 200 shares $838.10 −1.9% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 200 | $838.10 | $168K | −1.9% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 200 shares $844.81 −2.7% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 200 | $844.81 | $169K | −2.7% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 200 shares $846.94 −2.9% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 200 | $846.94 | $169K | −2.9% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 240 shares $855.72 −3.9% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 240 | $855.72 | $205K | −3.9% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 240 shares $857.41 −4.1% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 240 | $857.41 | $206K | −4.1% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 240 shares $868.43 −5.3% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 240 | $868.43 | $208K | −5.3% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 280 shares $842.23 −2.4% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 280 | $842.23 | $236K | −2.4% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 280 shares $860.47 −4.5% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 280 | $860.47 | $241K | −4.5% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 280 shares $861.07 −4.5% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 280 | $861.07 | $241K | −4.5% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 320 shares $841.05 −2.3% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 320 | $841.05 | $269K | −2.3% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 320 shares $847.98 −3.1% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 320 | $847.98 | $271K | −3.1% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 320 shares $851.45 −3.5% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 320 | $851.45 | $272K | −3.5% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 320 shares $864.41 −4.9% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 320 | $864.41 | $277K | −4.9% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 360 shares $843.55 −2.6% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 360 | $843.55 | $304K | −2.6% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 480 shares $836.92 −1.8% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 480 | $836.92 | $402K | −1.8% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 560 shares $849.53 −3.2% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 560 | $849.53 | $476K | −3.2% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 640 shares $852.87 −3.6% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 640 | $852.87 | $546K | −3.6% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 680 shares $854.41 −3.8% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 680 | $854.41 | $581K | −3.8% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 800 shares $825.65 −0.4% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 800 | $825.65 | $661K | −0.4% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 880 shares $823.72 −0.2% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 880 | $823.72 | $725K | −0.2% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 880 shares $839.15 −2.0% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 880 | $839.15 | $738K | −2.0% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,000 shares $840.12 −2.2% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,000 | $840.12 | $840K | −2.2% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,040 shares $819.39 +0.3% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,040 | $819.39 | $852K | +0.3% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,320 shares $820.54 +0.2% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,320 | $820.54 | $1.1M | +0.2% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,320 shares $835.67 −1.6% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,320 | $835.67 | $1.1M | −1.6% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,400 shares $824.60 −0.3% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,400 | $824.60 | $1.2M | −0.3% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,440 shares $834.80 −1.5% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,440 | $834.80 | $1.2M | −1.5% | Sep 15, 2026 |
| Sep 11, 2026 | Romano Gianluca (CFO) 1,550 shares $821.42 +0.1% since trade filed Sep 15, 2026 | Planned sale (10b5-1) | 1,550 | $821.42 | $1.3M | +0.1% | Sep 15, 2026 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles. The share count changed 1-for-2 on May 4, 2026. This table prints prices and share counts as they were filed, on the basis of the day, while the charts above are on today's; “Since trade” puts the filed price on today's basis first, which is why it does not divide into the price beside it.
Filing hygiene
313 Forms 4, 3 years
1 filed late
4 amendments
1.6 avg. days to file
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.