Insider trades › Cynthia L. Tregillis
Cynthia L. Tregillis
A corporate insider: an officer, director or owner of more than 10% of a company. Insiders report their trades to the SEC on Form 4The form insiders use to report each purchase or sale of their company's stock. It is due within two business days of the trade. · Last filing Oct 22, 2026
Ask your AI about this
Connect Claude, ChatGPT, Gemini or Grok (Microsoft 365 Copilot coming soon) to 13F.ai and ask in plain English. Copy a question to get started:
Using 13F.ai, list Cynthia L. Tregillis's open-market buys and sells across companies in the last two years, with the Form 4 links.
Using 13F.ai, how did the stocks Cynthia L. Tregillis bought perform after the purchase compared with the S&P 500?
Using 13F.ai, are other insiders at the same companies buying or selling at the same time as Cynthia L. Tregillis?
Connect your AI · Plans and the 7-day free trial (card required)
Buying and selling by quarter
Dollars bought and sold on the open market over the last two years.
Bought Sold
By trade date, using the shares and price reported for each trade. Stock grants, option exercises and shares withheld for tax are left out.
Roles
The companies where this person reports as an insider, and their position at each, most recent first.
| Company | Role | Last filed |
|---|---|---|
| WDC Western Digital Corporation | Chief Legal Officer & Corp Sec | Oct 22, 2026 |
Roles come from the filings themselves and can change over time.
Latest open-market trades
Purchases and sales at every company, most recent filing first.
| How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss. | Filing | ||||||
|---|---|---|---|---|---|---|---|
| Oct 21, 2026 | WDC Western Digital Corporation | Sale | 807 | $380.00 | $306.7K | -19.5% | Form 4 ↗ |
| Sep 4, 2026 | WDC Western Digital Corporation | Sale | 432 | $451.20 | $194.9K | -34.7% | Form 4 ↗ |
| Aug 27, 2026 | WDC Western Digital Corporation | Sale | 1,007 | $478.36 | $481.7K | -33.8% | Form 4 ↗ |
| Aug 26, 2026 | WDC Western Digital Corporation | Sale | 476 | $450.78 | $214.6K | -35.4% | Form 4 ↗ |
| Aug 24, 2026 | WDC Western Digital Corporation | Sale | 684 | $446.17 | $305.2K | -30.9% | Form 4 ↗ |
| Aug 21, 2026 | WDC Western Digital Corporation | Sale | 235 | $477.27 | $112.2K | -34.2% | Form 4 ↗ |
| Jul 21, 2026 | WDC Western Digital Corporation | Sale | 808 | $529.63 | $427.9K | -46.9% | Form 4 ↗ |
| Jun 5, 2026 | WDC Western Digital Corporation | Sale | 432 | $545.60 | $235.7K | -44.5% | Form 4 ↗ |
| May 27, 2026 | WDC Western Digital Corporation | Sale | 214 | $539.63 | $115.5K | -44.8% | Form 4 ↗ |
| May 22, 2026 | WDC Western Digital Corporation | Sale | 308 | $488.61 | $150.5K | -40.1% | Form 4 ↗ |
| May 21, 2026 | WDC Western Digital Corporation | Sale | 106 | $458.87 | $48.6K | -40.8% | Form 4 ↗ |
| Apr 21, 2026 | WDC Western Digital Corporation | Sale | 363 | $377.09 | $136.9K | -30.1% | Form 4 ↗ |
| Mar 4, 2026 | WDC Western Digital Corporation | Sale | 777 | $257.91 | $200.4K | +3.0% | Form 4 ↗ |
| Mar 4, 2026 | WDC Western Digital Corporation | Sale | 8,547 | $269.22 | $2.3M | +3.0% | Form 4 ↗ |
| Feb 26, 2026 | WDC Western Digital Corporation | Sale | 214 | $286.11 | $61.2K | -4.7% | Form 4 ↗ |
| Feb 24, 2026 | WDC Western Digital Corporation | Sale | 308 | $281.70 | $86.8K | -0.5% | Form 4 ↗ |
| Feb 23, 2026 | WDC Western Digital Corporation | Sale | 130 | $283.83 | $36.9K | -5.1% | Form 4 ↗ |
| Feb 6, 2026 | WDC Western Digital Corporation | Sale | 6,780 | $270.49 | $1.8M | -4.6% | Form 4 ↗ |
| Jan 21, 2026 | WDC Western Digital Corporation | Sale | 447 | $229.00 | $102.4K | +12.2% | Form 4 ↗ |
| Dec 2, 2025 | WDC Western Digital Corporation | Sale | 2,801 | $160.57 | $449.8K | +74.1% | Form 4 ↗ |
| Aug 22, 2025 | WDC Western Digital Corporation | Sale | 14,067 | $74.78 | $1.1M | +267.2% | Form 4 ↗ |
Each row links to its Form 4. Since trade compares the stock’s move from the close on the trade date (or the next trading day) to its latest close with the S&P 500 over the same days, adjusted for splits and excluding dividends. It describes the stock, not what the trader made: we don’t know their purchase price, position size or later sales. A dash means the trade isn’t matched to a listed stock, or there is no closing price after it yet.
When several people report on the same filing, we list it under the first one named, so trades by someone usually listed second may be missing here. Information, not investment advice: see the disclaimer.