WESTERN DIGITAL CORP
Total Trades
58
Buys
0
Sells
47
Largest Trade
N/A
Insiders
12
Institutional Funds
1,004
Inst. Value
$1M+
Activist Filings
19
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Tregillis Cynthia L | Chief Legal Office… | EXERCISE | N/A | 23 | — | Mar 6, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $1M+ | 9K | $268.27 | Mar 6, 2026 |
| Gubbi Vidyadhara K | Chief of Global Op… | EXERCISE | N/A | 47 | — | Mar 6, 2026 |
| Gubbi Vidyadhara K | Chief of Global Op… | SELL | $1M+ | 10K | $270.31 | Mar 6, 2026 |
| Cole Martin I | Director | SELL | $1M+ | 6K | $271.67 | Mar 4, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | EXERCISE | N/A | 6 | — | Feb 27, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $50K–$100K | 214 | $286.11 | Feb 27, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $100K–$500K | 438 | $282.33 | Feb 24, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | EXERCISE | N/A | 12 | — | Feb 24, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $1M+ | 7K | $270.49 | Feb 6, 2026 |
| MASSENGILL MATTHEW E | Director | SELL | $1M+ | 37K | $260.43 | Feb 6, 2026 |
| Tan Irving | CEO | SELL | $1M+ | 20K | $255.44 | Feb 4, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $100K–$500K | 447 | $229.00 | Jan 21, 2026 |
| Tregillis Cynthia L | Chief Legal Office… | EXERCISE | N/A | 11 | — | Jan 21, 2026 |
| Gubbi Vidyadhara K | Chief of Global Op… | SELL | $1M+ | 23K | $163.16 | Dec 8, 2025 |
| Alexy Kimberly | Director | SELL | $100K–$500K | 2K | $160.08 | Dec 8, 2025 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $100K–$500K | 3K | $160.57 | Dec 3, 2025 |
| Cole Martin I | Director | SELL | $500K+ | 6K | $162.62 | Dec 3, 2025 |
| Oulman Roxanne | Director | SELL | $100K–$500K | 2K | $154.42 | Nov 26, 2025 |
| Alexy Kimberly | Director | SELL | $100K–$500K | 2K | $154.00 | Nov 26, 2025 |
| Cole Martin I | Director | SELL | $1M+ | 10K | $161.32 | Nov 7, 2025 |
| Tan Irving | CEO | SELL | $1M+ | 20K | $150.69 | Nov 5, 2025 |
| Gubbi Vidyadhara K | Chief of Global Op… | SELL | $1M+ | 11K | $90.29 | Sep 5, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 353 | $80.90 | Aug 28, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | EXERCISE | N/A | 1 | — | Aug 28, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | EXERCISE | N/A | 2 | — | Aug 27, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $50K–$100K | 814 | $79.10 | Aug 27, 2025 |
| Zamiska Gene M. | SVP | SELL | $100K–$500K | 5K | $75.35 | Aug 25, 2025 |
| Zamiska Gene M. | SVP | EXERCISE | N/A | 6 | — | Aug 25, 2025 |
| Tregillis Cynthia L | Chief Legal Office… | SELL | $1M+ | 14K | $74.78 | Aug 25, 2025 |
| Tregillis Cynthia L | Chief Legal Office… | EXERCISE | N/A | 18 | — | Aug 25, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $1K–$15K | 245 | $58.01 | Jun 17, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $50K–$100K | 2K | $54.88 | Jun 6, 2025 |
| Tan Irving | CEO | SELL | $500K+ | 11K | $48.19 | May 14, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 456 | $43.37 | Mar 13, 2025 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 313 | $72.63 | Dec 2, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 658 | $69.99 | Nov 27, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 376 | $64.47 | Nov 22, 2024 |
| SODERBERY ROBERT | EVP & GM | SELL | $1M+ | 31K | $68.01 | Oct 30, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $100K–$500K | 2K | $69.94 | Oct 28, 2024 |
| Goeckeler David | CEO | SELL | $1M+ | 75K | $72.58 | Oct 28, 2024 |
| Goeckeler David | CEO | SELL | $1M+ | 75K | $70.32 | Sep 27, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 315 | $63.32 | Aug 30, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $100K–$500K | 3K | $61.48 | Aug 27, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 417 | $64.89 | Aug 22, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | GRANT | N/A | 13K | — | Aug 22, 2024 |
| Zamiska Gene M. | SVP | SELL | $15K–$50K | 219 | $78.00 | Jun 18, 2024 |
| SODERBERY ROBERT | EVP & GM | SELL | $1M+ | 27K | $73.48 | Jun 6, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 416 | $71.88 | May 22, 2024 |
| Zamiska Gene M. | SVP & Princ. Acctg… | SELL | $15K–$50K | 443 | $75.00 | Apr 9, 2024 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 1,004 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| STATE STREET CORP | 15.7M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 8.2M | $1M+ | SH |
| WCM INVESTMENT MANAGEMENT, LLC | 6.7M | $1M+ | SH |
| NORGES BANK | 4.6M | $1M+ | SH |
| DIMENSIONAL FUND ADVISORS LP | 3.1M | $1M+ | SH |
| Maple Rock Capital Partners Inc. | 2.4M | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.3M | $1M+ | SH |
| VANGUARD GROUP INC | 1.9M | $1M+ | SH |
| AMF Tjanstepension AB | 1.8M | $1M+ | SH |
| National Pension Service | 1.7M | $1M+ | SH |
| ALLIANCEBERNSTEIN L.P. | 1.6M | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 1.4M | $1M+ | SH |
| Robeco Institutional Asset Management B.V. | 1.4M | $1M+ | SH |
| BANK OF NOVA SCOTIA | 1.1M | $1M+ | SH |
| Capital World Investors | 1.1M | $1M+ | SH |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.0M | $1M+ | SH |
| PRUDENTIAL FINANCIAL INC | 1.0M | $1M+ | SH |
| RENAISSANCE TECHNOLOGIES LLC | 993K | $1M+ | SH |
| Swiss National Bank | 951K | $1M+ | SH |
| PRINCIPAL FINANCIAL GROUP INC | 943K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Feb 10, 2026
2.6%
9.0M shares
SC 13G/A · Jan 8, 2026
10.1%
34.5M shares
SC 13G/A · Nov 14, 2025
5.3%
18.4M shares
SC 13G/A · Nov 5, 2025
7.0%
24.4M shares
SC 13G · Aug 14, 2025
6.4%
22.2M shares
SC 13G/A · Aug 6, 2025
9.5%
33.2M shares
SC 13G/A · May 12, 2025
8.1%
28.1M shares
SC 13G/A · Apr 22, 2025
5.3%
18.5M shares
SC 13G/A · Feb 12, 2025
6.7%
23.3M shares
SC 13G/A · Feb 12, 2025
6.9%
24.0M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Nov 14, 2024
3.5%
12.0M shares
SC 13G · Nov 12, 2024
5.6%
19.4M shares
JPMORGAN CHASE & CO. 13-2624428
SC 13G · Oct 15, 2024
5.0%
17.5M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G · Feb 14, 2024
7.5%
24.2M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
11.9%
38.6M shares
SC 13G/A · Jan 25, 2024
8.5%
27.7M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G · Feb 14, 2023
6.5%
20.7M shares
SC 13G/A · Feb 10, 2023
8.2%
26.0M shares
SC 13G/A · Mar 11, 2022
8.3%
25.8M shares