Computer Storage Devices
Standard Industrial Classification: SIC 3572
Industry Insider Sentiment Analysis
The Computer Storage Devices sector (SIC 3572) acts as a critical barometer for broader economic health. Our real-time monitoring reveals total transactions. Monitoring "cluster buying" is one of the most reliable leading indicators for future sector performance. By analyzing aggregate data across this specific Standard Industrial Classification, investors can filter out individual company volatility and identify high-conviction trends. When multiple directors and officers within the same industry move capital simultaneously, it often signals an upcoming sector-wide revaluation or a fundamental shift in supply chain dynamics that has yet to be recognized by the broader public market.
| Filing Date | Trade Date | Ticker | Company | Reporting Person | Relationship | Type | Price | Qty | Total, $ | Owned After |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-05-22 23:24 | 2026-05-21 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | OPT+S | $458.87 | 106 | $48,640 | 118,443 |
| 2026-05-21 20:52 | 2026-05-20 | STX | Seagate Technology Holdings plc | MOSLEY WILLIAM D | Director, Officer | OPT+S | $751.29 | 30,000 | $22,538,568 | 339,591 |
| 2026-05-20 20:30 | 2026-05-18 | NTAP | NetApp, Inc. | De Lorenzo Daniel | Officer | SELL | $120.00 | 275 | $33,000 | 1,090 |
| 2026-05-14 21:36 | 2026-05-12 | SNDK | Sandisk Corp | Pokorny Michael | Officer | SELL | $1,426.18 | 2,446 | $3,488,436 | 22,375 |
| 2026-05-14 20:52 | 2026-05-13 | STX | Seagate Technology Holdings plc | Teh Ban Seng | Officer | OPT+S | $815.42 | 15,560 | $12,687,979 | 3,691 |
| 2026-05-13 20:28 | 2026-05-11 | P | Everpure, Inc. | Colgrove John | Director, Officer | SELL | $85.93 | 200,000 | $17,185,620 | 2,665,000 |
| 2026-05-13 20:30 | 2026-05-11 | NTAP | NetApp, Inc. | O'Callahan Elizabeth M | Officer | SELL | $117.73 | 1,000 | $117,730 | 18,382 |
| 2026-05-13 20:30 | 2026-05-11 | P | Everpure, Inc. | Giancarlo Charles H | Director, Officer | OPT+S | $87.66 | 580,000 | $50,845,352 | 1,849,633 |
| 2026-05-13 01:06 | 2026-05-11 | WDC | WESTERN DIGITAL CORP | Davis Brian Scott | Officer | SELL | $500.69 | 10,000 | $5,006,895 | 105,564 |
| 2026-05-12 01:12 | 2026-05-08 | SNDK | Sandisk Corp | Sayiner Necip | Director | SELL | $1,503.11 | 579 | $870,301 | 2,900 |
| 2026-05-08 21:00 | 2026-05-06 | STX | Seagate Technology Holdings plc | Romano Gianluca | Officer | SELL | $774.22 | 22,488 | $17,410,693 | 42,847 |
| 2026-05-08 21:00 | 2026-05-07 | STX | Seagate Technology Holdings plc | Romano Gianluca | Officer | SELL | $770.00 | 1,902 | $1,464,540 | 40,945 |
| 2026-05-07 20:21 | 2026-05-05 | P | Everpure, Inc. | Colgrove John | Director, Officer | SELL | $75.14 | 134,265 | $10,088,484 | 467,694 |
| 2026-05-06 20:36 | 2026-05-04 | STX | Seagate Technology Holdings plc | Lee James CI | Officer | SELL | $741.17 | 697 | $516,595 | 324 |
| 2026-05-06 20:36 | 2026-05-04 | STX | Seagate Technology Holdings plc | Morris John Christopher | Officer | SELL | $738.37 | 5,626 | $4,154,090 | 11,954 |
| 2026-05-06 20:36 | 2026-05-05 | STX | Seagate Technology Holdings plc | Tilenius Stephanie | Director | SELL | $766.61 | 1,580 | $1,211,250 | 10,664 |
| 2026-05-05 22:14 | 2026-05-01 | WDC | WESTERN DIGITAL CORP | Tan Irving | Director, Officer | SELL | $411.84 | 20,000 | $8,236,864 | 598,150 |
| 2026-05-05 22:14 | 2026-05-04 | WDC | WESTERN DIGITAL CORP | Gubbi Vidyadhara K | Officer | SELL | $443.19 | 4,674 | $2,071,447 | 90,041 |
| 2026-04-28 20:24 | 2026-04-24 | P | Everpure, Inc. | Colgrove John | Director, Officer | SELL | $70.01 | 28,935 | $2,025,739 | 0 |
| 2026-04-23 22:39 | 2026-04-21 | P | Everpure, Inc. | Colgrove John | Director, Officer | SELL | $70.27 | 171,065 | $12,021,063 | 28,935 |
| 2026-04-22 23:28 | 2026-04-21 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | OPT+S | $377.09 | 363 | $136,884 | 120,023 |
| 2026-04-14 20:30 | 2026-04-10 | NTAP | NetApp, Inc. | O'Callahan Elizabeth M | Officer | SELL | $96.25 | 1,000 | $96,250 | 19,382 |
| 2026-04-03 20:15 | 2026-04-02 | QMCO | QUANTUM CORP /DE/ | Nash Laura A. | Officer | SELL | $5.44 | 109 | $593 | 11,030 |
| 2026-04-02 20:53 | 2026-04-01 | STX | Seagate Technology Holdings plc | MOSLEY WILLIAM D | Director, Officer | SELL | $420.73 | 20,000 | $8,414,638 | 355,591 |
| 2026-03-23 20:20 | 2026-03-19 | STX | Seagate Technology Holdings plc | MOSLEY WILLIAM D | Director, Officer | SELL | $406.77 | 24,584 | $10,000,034 | 375,591 |
| 2026-03-16 20:30 | 2026-03-13 | STX | Seagate Technology Holdings plc | Morris John Christopher | Officer | SELL | $377.44 | 112 | $42,273 | 17,580 |
| 2026-03-12 20:30 | 2026-03-10 | NTAP | NetApp, Inc. | O'Callahan Elizabeth M | Officer | SELL | $100.67 | 1,000 | $100,670 | 20,382 |
| 2026-03-10 21:44 | 2026-03-06 | WDC | WESTERN DIGITAL CORP | Gubbi Vidyadhara K | Officer | SELL | $255.33 | 8,518 | $2,174,858 | 99,276 |
| 2026-03-06 03:54 | 2026-03-04 | WDC | WESTERN DIGITAL CORP | Gubbi Vidyadhara K | Officer | OPT+S | $270.31 | 10,148 | $2,743,110 | 107,794 |
| 2026-03-06 03:55 | 2026-03-04 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | OPT+S | $268.27 | 9,324 | $2,501,382 | 121,682 |
| 2026-03-04 03:05 | 2026-03-02 | WDC | WESTERN DIGITAL CORP | Cole Martin I | Director | SELL | $271.67 | 6,000 | $1,630,002 | 29,433 |
| 2026-03-04 02:14 | 2026-03-02 | STX | Seagate Technology Holdings plc | Conyers Yolanda Lee | Director | SELL | $393.59 | 750 | $295,193 | 4,851 |
| 2026-03-04 02:14 | 2026-03-02 | STX | Seagate Technology Holdings plc | MOSLEY WILLIAM D | Director, Officer | SELL | $384.76 | 20,000 | $7,695,262 | 395,897 |
| 2026-02-28 00:57 | 2026-02-26 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | OPT+S | $286.11 | 214 | $61,228 | 133,781 |
| 2026-02-27 03:12 | 2026-02-25 | SNDK | Sandisk Corp | Suzuki Miyuki | Director | SELL | $627.53 | 3,500 | $2,196,360 | 9,907 |
| 2026-02-26 00:18 | 2026-02-24 | STX | Seagate Technology Holdings plc | Morris John Christopher | Officer | SELL | $410.00 | 240 | $98,400 | 16,566 |
| 2026-02-25 01:44 | 2026-02-23 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | OPT+S | $282.33 | 438 | $123,662 | 134,759 |
| 2026-02-24 01:20 | 2026-02-23 | STX | Seagate Technology Holdings plc | Chong Kian Fatt | Officer | OPT+S | $416.48 | 5,846 | $2,434,740 | 0 |
| 2026-02-20 01:25 | 2026-02-17 | WDC | WESTERN DIGITAL CORP | Davis Brian Scott | Officer | SELL | $279.16 | 10,000 | $2,791,603 | 121,792 |
| 2026-02-20 00:30 | 2026-02-17 | NTAP | NetApp, Inc. | De Lorenzo Daniel | Officer | SELL | $101.84 | 252 | $25,664 | 0 |
| 2026-02-12 01:15 | 2026-02-10 | NTAP | NetApp, Inc. | O'Callahan Elizabeth M | Officer | SELL | $103.45 | 1,000 | $103,450 | 20,075 |
| 2026-02-07 02:09 | 2026-02-06 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | SELL | $270.49 | 6,780 | $1,833,922 | 136,538 |
| 2026-02-07 02:09 | 2026-02-05 | WDC | WESTERN DIGITAL CORP | MASSENGILL MATTHEW E | Director | SELL | $260.43 | 36,926 | $9,616,465 | 0 |
| 2026-02-05 02:17 | 2026-02-02 | WDC | WESTERN DIGITAL CORP | Tan Irving | Director, Officer | SELL | $255.44 | 20,000 | $5,108,832 | 623,586 |
| 2026-02-04 00:48 | 2026-02-02 | STX | Seagate Technology Holdings plc | MOSLEY WILLIAM D | Director, Officer | SELL | $429.27 | 20,000 | $8,585,358 | 410,056 |
| 2026-02-03 00:13 | 2026-01-30 | STX | Seagate Technology Holdings plc | Geldmacher Jay L | Director | SELL | $448.03 | 925 | $414,423 | 223 |
| 2026-02-03 00:13 | 2026-01-29 | STX | Seagate Technology Holdings plc | Teh Ban Seng | Officer | OPT+S | $442.29 | 20,195 | $8,931,994 | 3,092 |
| 2026-01-29 05:27 | 2026-01-26 | STX | Seagate Technology Holdings plc | Lee James CI | Officer | SELL | $348.85 | 673 | $234,776 | 257 |
| 2026-01-22 01:14 | 2026-01-21 | WDC | WESTERN DIGITAL CORP | Tregillis Cynthia L | Officer | OPT+S | $229.00 | 447 | $102,363 | 143,318 |
| 2026-01-15 01:04 | 2026-01-12 | STX | Seagate Technology Holdings plc | Teh Ban Seng | Officer | OPT+S | $299.31 | 1,412 | $422,626 | 13,693 |
Sector-Wide Insider Alpha
Analyzing insider movements across the Computer Storage Devices sector provides a macro-view of executive conviction. When multiple leaders in different companies within the same SIC code (3572) simultaneously buy shares, it often indicates an industry-wide undervaluation or a positive shift in market cycles.
SEC Filings in Computer Storage Devices
Every transaction in the Computer Storage Devices industry is reported via Form 4 disclosures. By filtering these filings by industry, investors can detect institutional-scale sentiment shifts before they are reflected in broader market indices, following the capital flow of those with intimate industry knowledge.
UNDERSTANDING THE DATA
FILING DATE: The date and time when the transaction was reported to the SEC. This is when the public first receives the information.
TRADE DATE: The actual day the insider executed the purchase or sale in the market.
INDUSTRY: The specific market sector the company operates in. Useful for identifying broader institutional capital flows across sectors.
OWNED AFTER: The total number of shares held by the insider following the transaction. This highlights the insider's remaining conviction in the company.
CHANGE %: The percentage increase or decrease of the insider's total position. Large percentage changes often carry more weight than the dollar amount alone.
TRADE TYPES DEFINITIONS
BUY: An open market purchase. Typically indicates an insider's belief that the stock is undervalued or poised for growth.
SELL: An open market sale. While often used for diversification or liquidity, large or unexpected sales can be a warning signal.
OPT+S (OPTION EXERCISE & SALE): This occurs when an insider exercises their stock options and sells them immediately. Often part of a structured compensation plan.