Western Digital insider activity
What the executives and directors of Western Digital actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$74M
net open-market flow, 12 m
0 open-market buys, 12 m
74.3%
of sale value on 10b5-1 plans, 12 m
3,810 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 180 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Oct 20, 2026 | Tregillis Cynthia L | 1,324 |
| Sep 20, 2026 | Tan Irving | 1,148 |
| Sep 20, 2026 | Davis Brian Scott | 971 |
| Sep 17, 2026 | Shihab Ahmed Mohammed | 5,206 |
| Sep 3, 2026 | Tregillis Cynthia L | 707 |
| Sep 3, 2026 | Davis Brian Scott | 889 |
| Sep 3, 2026 | Gubbi Vidyadhara K | 1,778 |
| Sep 1, 2026 | Tan Irving | 225K |
| Aug 26, 2026 | Sennesael Kris | 13K |
| Aug 26, 2026 | Tan Irving | 20K |
| Aug 26, 2026 | Tregillis Cynthia L | 6,296 |
| Aug 26, 2026 | Davis Brian Scott | 6,248 |
| Aug 26, 2026 | Gubbi Vidyadhara K | 8,388 |
| Aug 26, 2026 | Shihab Ahmed Mohammed | 9,478 |
| Aug 25, 2026 | Feller Brad | 2,068 |
| Aug 21, 2026 | Tan Irving | 727 |
| Aug 21, 2026 | Tregillis Cynthia L | 1,502 |
| Aug 21, 2026 | Davis Brian Scott | 1,318 |
| Aug 21, 2026 | Gubbi Vidyadhara K | 1,295 |
| Jul 20, 2026 | Tregillis Cynthia L | 1,322 |
| Jun 20, 2026 | Tan Irving | 1,142 |
| Jun 20, 2026 | Davis Brian Scott | 968 |
| Jun 17, 2026 | Shihab Ahmed Mohammed | 5,200 |
| Jun 3, 2026 | Tregillis Cynthia L | 705 |
| Jun 3, 2026 | Davis Brian Scott | 887 |
| Jun 3, 2026 | Gubbi Vidyadhara K | 1,777 |
| May 26, 2026 | Das Manuvir | 772 |
| May 25, 2026 | Tan Irving | 509 |
| May 25, 2026 | Tregillis Cynthia L | 778 |
| May 25, 2026 | Davis Brian Scott | 978 |
| May 25, 2026 | Gubbi Vidyadhara K | 1,151 |
| May 21, 2026 | Tan Irving | 767 |
| May 21, 2026 | Tregillis Cynthia L | 1,500 |
| May 21, 2026 | Davis Brian Scott | 1,318 |
| May 21, 2026 | Gubbi Vidyadhara K | 1,295 |
| May 20, 2026 | Sennesael Kris | 19K |
| May 15, 2026 | KIDDOO BRUCE E | 100 |
| Apr 20, 2026 | Tregillis Cynthia L | 1,320 |
| Apr 20, 2026 | Gubbi Vidyadhara K | 4,629 |
| Mar 20, 2026 | Tan Irving | 1,091 |
| Mar 20, 2026 | Davis Brian Scott | 968 |
| Mar 17, 2026 | Shihab Ahmed Mohammed | 21K |
| Mar 3, 2026 | Tan Irving | 3,604 |
| Mar 3, 2026 | Tregillis Cynthia L | 2,821 |
| Mar 3, 2026 | Davis Brian Scott | 3,549 |
| Mar 3, 2026 | Gubbi Vidyadhara K | 7,101 |
| Feb 25, 2026 | Tan Irving | 452 |
| Feb 25, 2026 | Tregillis Cynthia L | 776 |
| Feb 25, 2026 | Davis Brian Scott | 855 |
| Feb 25, 2026 | Gubbi Vidyadhara K | 1,017 |
| Feb 21, 2026 | Tan Irving | 689 |
| Feb 21, 2026 | Tregillis Cynthia L | 1,365 |
| Feb 21, 2026 | Davis Brian Scott | 944 |
| Feb 21, 2026 | Gubbi Vidyadhara K | 928 |
| Feb 12, 2026 | KIDDOO BRUCE E | 910 |
| Jan 20, 2026 | Tregillis Cynthia L | 853 |
| Dec 20, 2025 | Tan Irving | 1,010 |
| Dec 20, 2025 | Davis Brian Scott | 968 |
| Nov 25, 2025 | Tan Irving | 395 |
| Nov 25, 2025 | Tregillis Cynthia L | 775 |
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 chart, in numbers
| Flow | Shares |
|---|---|
| From holdings | 438K |
| Granted | 68K |
| Vested / exercised | 1,700 |
| Other in | 113K |
| Withheld for tax | 156K |
| Planned sales (10b5-1) | 167K |
| Discretionary sales | 72K |
| Gifts | 114K |
| Other out | 113K |
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 chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| Tan Irving | 617K | 266K | 43 |
| Sennesael Kris | 172K | 174K | 101.1 |
| Shihab Ahmed Mohammed | 156K | 159K | 101.4 |
Who holds what
the 14 largest holdings of 23| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| Goeckeler David Chief Executive Officer Last trade Oct 25, 2024 | CEO | 812K | – | – | Oct 25, 2024 | |
| JABRE WISSAM G EVP & CFO | CFO | 336K | – | – | – | |
| Tan Irving Chief Executive Officer Last trade Aug 11, 2026 | CEO | 267K | – | $22M | net selling over the year: 0 months buying, 3 months selling | Aug 11, 2026 |
| Sennesael Kris Chief Financial Officer | CFO | 178K | – | – | – | |
| RAY MICHAEL CHARLES EVP, Chief Legal Officer & Sec Last trade Jan 29, 2021 | Officer | 178K | – | – | Jan 29, 2021 | |
| Shihab Ahmed Mohammed Chief Product Officer | Officer | 164K | – | – | – | |
| SODERBERY ROBERT EVP & GM, Flash Business Last trade Oct 29, 2024 | Officer | 133K | – | – | Oct 29, 2024 | |
| Tregillis Cynthia L Chief Legal Officer & Corp Sec Last trade Oct 21, 2026 | Officer | 109K | – | $7.8M | net selling over the year: 0 months buying, 11 months selling | Oct 21, 2026 |
| Bennett Don R Interim CFO | CFO | 105K | – | – | – | |
| Davis Brian Scott Chief Sales & Mrktng Officer Last trade May 11, 2026 | Officer | 100K | – | $7.8M | net selling over the year: 0 months buying, 2 months selling | May 11, 2026 |
| Gubbi Vidyadhara K Chief of Global Operations Last trade Sep 4, 2026 | Officer | 81K | – | $13M | net selling over the year: 0 months buying, 5 months selling | Sep 4, 2026 |
| MASSENGILL MATTHEW E Last trade Feb 5, 2026 | Director | 63K | – | $9.6M | net selling over the year: 0 months buying, 1 month selling | Feb 5, 2026 |
| DOLUCA TUNC | Director | 39K | – | – | – | |
| STREETER STEPHANIE A Last trade Sep 1, 2026 | Director | 36K | – | $2.5M | net selling over the year: 0 months buying, 2 months selling | Sep 1, 2026 |
Open-market trade log
the 60 most recent of 1,215| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Oct 29, 2026 | Cole Martin I (Director) 43 shares $401.47 −1.5% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 43 | $401.47 | $17K | −1.5% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 88 shares $400.33 −1.3% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 88 | $400.33 | $35K | −1.3% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 204 shares $390.04 +1.4% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 204 | $390.04 | $80K | +1.4% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 209 shares $395.30 +0.0% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 209 | $395.30 | $83K | +0.0% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 243 shares $394.41 +0.2% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 243 | $394.41 | $96K | +0.2% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 303 shares $399.36 −1.0% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 303 | $399.36 | $121K | −1.0% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 317 shares $396.31 −0.3% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 317 | $396.31 | $126K | −0.3% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 385 shares $391.05 +1.1% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 385 | $391.05 | $151K | +1.1% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 407 shares $392.42 +0.7% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 407 | $392.42 | $160K | +0.7% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 494 shares $393.22 +0.5% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 494 | $393.22 | $194K | +0.5% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 584 shares $397.48 −0.6% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 584 | $397.48 | $232K | −0.6% | Oct 30, 2026 |
| Oct 29, 2026 | Cole Martin I (Director) 723 shares $398.45 −0.8% since trade filed Oct 30, 2026 | Planned sale (10b5-1) | 723 | $398.45 | $288K | −0.8% | Oct 30, 2026 |
| Oct 21, 2026 | Tregillis Cynthia L (Officer) 807 shares $380.00 +4.0% since trade filed Oct 22, 2026 | Planned sale (10b5-1) | 807 | $380.00 | $307K | +4.0% | Oct 22, 2026 |
| Sep 4, 2026 | Tregillis Cynthia L (Officer) 432 shares $451.20 −12.4% since trade filed Sep 8, 2026 | Planned sale (10b5-1) | 432 | $451.20 | $195K | −12.4% | Sep 8, 2026 |
| Sep 4, 2026 | Gubbi Vidyadhara K (Officer) 1,795 shares $459.87 −14.0% since trade filed Sep 8, 2026 | Discretionary sale | 1,795 | $459.87 | $825K | −14.0% | Sep 8, 2026 |
| Sep 1, 2026 | STREETER STEPHANIE A (Director) 1,600 shares $455.00 −13.1% since trade filed Sep 2, 2026 | Discretionary sale | 1,600 | $455.00 | $728K | −13.1% | Sep 2, 2026 |
| Aug 31, 2026 | STREETER STEPHANIE A (Director) 2,000 shares $447.06 −11.6% since trade filed Sep 2, 2026 | Discretionary sale | 2,000 | $447.06 | $894K | −11.6% | Sep 2, 2026 |
| Aug 31, 2026 | STREETER STEPHANIE A (Director) 2,000 shares $448.58 −11.9% since trade filed Sep 2, 2026 | Discretionary sale | 2,000 | $448.58 | $897K | −11.9% | Sep 2, 2026 |
| Aug 27, 2026 | Tregillis Cynthia L (Officer) 1,007 shares $478.36 −17.4% since trade filed Aug 27, 2026 | Planned sale (10b5-1) | 1,007 | $478.36 | $482K | −17.4% | Aug 27, 2026 |
| Aug 26, 2026 | Tregillis Cynthia L (Officer) 476 shares $450.78 −12.3% since trade filed Aug 27, 2026 | Planned sale (10b5-1) | 476 | $450.78 | $215K | −12.3% | Aug 27, 2026 |
| Aug 24, 2026 | Tregillis Cynthia L (Officer) 684 shares $446.17 −11.4% since trade filed Aug 24, 2026 | Planned sale (10b5-1) | 684 | $446.17 | $305K | −11.4% | Aug 24, 2026 |
| Aug 21, 2026 | Tregillis Cynthia L (Officer) 235 shares $477.27 −17.2% since trade filed Aug 24, 2026 | Planned sale (10b5-1) | 235 | $477.27 | $112K | −17.2% | Aug 24, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 989 shares $442.22 −10.6% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 989 | $442.22 | $437K | −10.6% | Aug 12, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 1,546 shares $447.18 −11.6% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 1,546 | $447.18 | $691K | −11.6% | Aug 12, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 1,840 shares $443.35 −10.8% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 1,840 | $443.35 | $816K | −10.8% | Aug 12, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 1,880 shares $444.67 −11.1% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 1,880 | $444.67 | $836K | −11.1% | Aug 12, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 2,478 shares $441.48 −10.5% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 2,478 | $441.48 | $1.1M | −10.5% | Aug 12, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 4,822 shares $445.45 −11.3% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 4,822 | $445.45 | $2.1M | −11.3% | Aug 12, 2026 |
| Aug 11, 2026 | Tan Irving (CEO) 6,445 shares $446.38 −11.4% since trade filed Aug 12, 2026 | Planned sale (10b5-1) | 6,445 | $446.38 | $2.9M | −11.4% | Aug 12, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 32 shares $425.31 −7.1% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 32 | $425.31 | $14K | −7.1% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 32 shares $435.59 −9.3% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 32 | $435.59 | $14K | −9.3% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 32 shares $442.47 −10.7% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 32 | $442.47 | $14K | −10.7% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 32 shares $444.51 −11.1% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 32 | $444.51 | $14K | −11.1% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 32 shares $447.10 −11.6% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 32 | $447.10 | $14K | −11.6% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 32 shares $465.12 −15.0% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 32 | $465.12 | $15K | −15.0% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 38 shares $432.20 −8.5% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 38 | $432.20 | $16K | −8.5% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 39 shares $449.42 −12.0% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 39 | $449.42 | $18K | −12.0% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 41 shares $448.46 −11.9% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 41 | $448.46 | $18K | −11.9% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 64 shares $424.05 −6.8% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 64 | $424.05 | $27K | −6.8% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 64 shares $426.45 −7.3% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 64 | $426.45 | $27K | −7.3% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 64 shares $434.81 −9.1% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 64 | $434.81 | $28K | −9.1% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 64 shares $439.38 −10.0% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 64 | $439.38 | $28K | −10.0% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 70 shares $451.30 −12.4% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 70 | $451.30 | $32K | −12.4% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 93 shares $429.12 −7.9% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 93 | $429.12 | $40K | −7.9% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 96 shares $440.96 −10.4% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 96 | $440.96 | $42K | −10.4% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 103 shares $430.45 −8.2% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 103 | $430.45 | $44K | −8.2% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 106 shares $452.12 −12.6% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 106 | $452.12 | $48K | −12.6% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 112 shares $433.84 −8.9% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 112 | $433.84 | $49K | −8.9% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 115 shares $428.08 −7.7% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 115 | $428.08 | $49K | −7.7% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 115 shares $431.41 −8.4% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 115 | $431.41 | $50K | −8.4% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 118 shares $438.08 −9.8% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 118 | $438.08 | $52K | −9.8% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 128 shares $454.44 −13.0% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 128 | $454.44 | $58K | −13.0% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 144 shares $453.27 −12.8% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 144 | $453.27 | $65K | −12.8% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 154 shares $436.89 −9.5% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 154 | $436.89 | $67K | −9.5% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 160 shares $462.30 −14.5% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 160 | $462.30 | $74K | −14.5% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 199 shares $461.23 −14.3% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 199 | $461.23 | $92K | −14.3% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 248 shares $459.97 −14.1% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 248 | $459.97 | $114K | −14.1% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 304 shares $455.55 −13.2% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 304 | $455.55 | $138K | −13.2% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 312 shares $456.52 −13.4% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 312 | $456.52 | $142K | −13.4% | Jul 29, 2026 |
| Jul 28, 2026 | Cole Martin I (Director) 328 shares $457.45 −13.6% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 328 | $457.45 | $150K | −13.6% | Jul 29, 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.
Filing hygiene
329 Forms 4, 3 years
0 filed late
0 amendments
1.7 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.