ウエスタンデジタル株式会社
US ˙ NasdaqGS ˙ US9581021055

SecurityWDC / Western Digital Corporation
InsiderCynthia L Tregillis
This page shows the track record and history of Tregillis Cynthia L insider trades in Western Digital Corporation. The SEC defines Insiders as officers, directors, or significant investors (greater than 10% ownership) in a company. It is illegal for insiders to make trades in their companies based on material, non-public information ("MNPI"). This does not mean it is illegal for them to make any trades in their own companies. However, they must report all trades to the SEC via a Form 4.
Insider Purchases - Short Term Profit Analysis

In this section, we analyze the profitability of every unplanned, open-market insider purchase made by Cynthia L Tregillis in WDC / Western Digital Corporation. This analysis helps to understand if the insider consistently generates abnormal returns, and is worth following. This analysis is for one-year following each trade, and the results are theoretical.

The following table shows the most recent open market purchases that were not part of an automatic trading plan.

Trade Date Reported
Shares
Reported
Price
Adjusted
Shares
Adjusted
Price
Cost Basis Days to
Max
Price at
Max
Max
Profit ($)
Max Return (%)
There are no known unplanned open-market trades for this insider

Adjusted Price is the split-adjusted price. Adjusted Shares is the split-adjusted shares.

WDC / Western Digital Corporation Insider Trades
Insider Sales - Short Term Loss Analysis

In this section, we analyze the short-term loss avoidance of every unplanned, open-market insider sale made by Cynthia L Tregillis in WDC / Western Digital Corporation. A consistent pattern of loss avoidance may suggest that future sale transactions may predict declines in price. This analysis is for one-year following each trade, and the results are theoretical.

The following table shows the most recent open market purchases that were not part of an automatic trading plan.

Trade Date Reported
Shares
Reported
Price
Adjusted
Shares
Adjusted
Price
Cost Basis Days to
Min
Price at
Min
Max Loss
Avoided ($)
Max Loss
Avoided (%)
2026-03-04 8,547 269.2156 8,547 269.2156 2,300,986 2 245.2500 -204,833 -8.90
2026-02-06 6,780 270.4900 6,780 270.4900 1,833,922
2025-12-02 2,801 160.5682 2,801 160.5682 449,752

Adjusted Price is the split-adjusted price. Adjusted Shares is the split-adjusted shares.

WDC / Western Digital Corporation Insider Trades
Insider Transaction History
File
Date
Trade
Date
Form Insider Ticker Security Title Code 10b5-1 Direct Exercise
Price
Unit
Price
Units
Changed
Value
Changed (1K)
Remaining
Options
Remaining
Shares
2026-06-05 2026-06-05 4 Tregillis Cynthia L WDC Common Stock S - Sale D 545.6000 -432 -236 116,643
2026-06-05 2026-06-03 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 594.1100 -699 -415 117,075
2026-06-05 2026-06-03 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 6 117,774
2026-05-27 2026-05-27 4 Tregillis Cynthia L WDC Common Stock S - Sale D 539.6300 -214 -115 117,157
2026-05-27 2026-05-25 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 484.2800 -771 -373 117,371
2026-05-27 2026-05-25 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 7 118,142
2026-05-27 2026-05-22 4 Tregillis Cynthia L WDC Common Stock S - Sale D 488.6100 -308 -150 118,135
2026-05-22 2026-05-21 4 Tregillis Cynthia L WDC Common Stock S - Sale D 458.8700 -106 -49 118,443
2026-05-22 2026-05-21 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 486.4600 -1,108 -539 118,549
2026-05-22 2026-05-21 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 10 119,657
2026-05-22 2026-05-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 459.6200 -379 -174 119,647
2026-05-22 2026-05-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 3 120,026
2026-04-22 2026-04-21 4 Tregillis Cynthia L WDC Common Stock S - Sale D 377.0900 -363 -137 120,023
2026-04-22 2026-04-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 374.1100 -1,308 -489 120,386
2026-04-22 2026-04-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 12 121,694
2026-03-05 2026-03-04 4 Tregillis Cynthia L WDC Common Stock S - Sale D 269.2156 -8,547 -2,301 121,682
2026-03-05 2026-03-04 4 Tregillis Cynthia L WDC Common Stock S - Sale D 257.9100 -777 -200 130,229
2026-03-05 2026-03-03 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 250.6100 -2,798 -701 131,006
2026-03-05 2026-03-03 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 23 133,804
2026-02-27 2026-02-26 4 Tregillis Cynthia L WDC Common Stock S - Sale D 286.1100 -214 -61 133,781
2026-02-27 2026-02-25 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 290.9500 -770 -224 133,995
2026-02-27 2026-02-25 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 6 134,765
2026-02-24 2026-02-24 4 Tregillis Cynthia L WDC Common Stock S - Sale D 281.7000 -308 -87 134,759
2026-02-24 2026-02-23 4 Tregillis Cynthia L WDC Common Stock S - Sale D 283.8300 -130 -37 135,067
2026-02-24 2026-02-21 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 285.5200 -1,109 -317 135,197
2026-02-24 2026-02-21 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 9 136,306
2026-02-24 2026-02-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 285.5200 -244 -70 136,297
2026-02-24 2026-02-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 3 136,541
2026-02-06 2026-02-06 4 Tregillis Cynthia L WDC Common Stock S - Sale D 270.4900 -6,780 -1,834 136,538
2026-01-21 2026-01-21 4 Tregillis Cynthia L WDC Common Stock S - Sale D 229.0000 -447 -102 143,318
2026-01-21 2026-01-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 222.9700 -842 -188 143,765
2026-01-21 2026-01-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 11 144,607
2025-12-03 2025-12-02 4 Tregillis Cynthia L WDC Common Stock S - Sale D 160.5682 -2,801 -450 144,596
2025-11-26 2025-11-25 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 155.4100 -770 -120 147,332
2025-11-26 2025-11-25 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 5 148,102
2025-11-24 2025-11-21 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 139.1900 -1,108 -154 148,097
2025-11-24 2025-11-21 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 7 149,205
2025-11-24 2025-11-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 140.2300 -379 -53 149,198
2025-11-24 2025-11-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 2 149,577
2025-10-21 2025-10-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 121.5300 -1,307 -159 149,575
2025-10-21 2025-10-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 8 150,882
2025-08-28 2025-08-27 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 80.6700 -266 -21 150,874
2025-08-28 2025-08-27 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 1 151,140
2025-08-28 2025-08-26 4 Tregillis Cynthia L WDC Common Stock A - Award D 16,554 151,139
2025-08-27 2025-08-25 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 79.2200 -769 -61 134,585
2025-08-27 2025-08-25 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 3 135,354
2025-08-25 2025-08-22 4 Tregillis Cynthia L WDC Common Stock S - Sale D 74.7800 -14,067 -1,052 135,351
2025-08-25 2025-08-21 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 74.6600 -4,428 -331 149,418
2025-08-25 2025-08-21 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 18 153,846
2025-08-21 2025-08-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 75.6400 -2,565 -194 153,828
2025-08-21 2025-08-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 10 156,393
2025-07-22 2025-07-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 68.0000 -1,306 -89 156,383
2025-07-22 2025-07-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 5 157,689
2025-06-23 2025-06-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 59.2900 -204 -12 157,684
2025-06-23 2025-06-20 4 Tregillis Cynthia L WDC Common Stock M - Exercise D 0 157,888
2025-05-28 2025-05-27 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 51.8200 -267 -14 157,661
2025-05-28 2025-05-25 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 50.1800 -768 -39 157,928
2025-05-22 2025-05-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 50.6300 -379 -19 158,696
2025-04-22 2025-04-20 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 36.5100 -1,172 -43 159,075
2025-03-10 2025-03-06 4 Tregillis Cynthia L WDC Common Stock F - Taxes D 41.4500 -875 -36 160,247
2025-03-05 2025-03-03 4 Tregillis Cynthia L WDC Common Stock A - Award D 21,272 161,122
2025-03-03 3 Tregillis Cynthia L WDC Common Stock D 139,850
P
非デリバティブまたはデリバティブ証券の公開市場または非公開購入
S
非デリバティブ証券またはデリバティブ証券の公開市場または非公開売却
A
会社からの有価証券の交付、授与その他の取得 (オプション等)
C
デリバティブの転換
D
有価証券の会社への売却または譲渡
F
会社から受領した有価証券の一部を使用した、行使価格または納税義務のお支払い
G
内部者によるまたは内部者に対する有価証券の贈与
K
株式スワップと類似のヘッジ取引
M
会社から受け取ったデリバティブ証券 (オプションなど) の行使または転換
V
フォーム4により任意に報告した取引
J
その他 (取引を説明する脚注を含む)