Summary
Updated Aug 31, 2026
William M. Sheriff is Executive Chairman, Director of enCore Energy Corp. (EU). 11 SEC Form 4 filings on record going back to 2025, most recently on 19 August 2026. Most recent open-market trade: bought $37K of EU on 20 May 2026. Lifetime open-market purchases: $206K. Lifetime open-market sales: $370K. Historical track record: 5/5 stars across 6 tracked purchases.
Recent Transactions
15Every recent SEC Form 4 transaction William M. Sheriff has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★★★ (5/5) |
| Total purchases tracked | 6 |
| Purchases with forward-return data | 6 |
| 30-day win rate | 100% |
| 90-day win rate | 50% |
| Avg 5-day return | +5.37% |
| Avg 30-day return | +23.30% |
| Avg 90-day return | +61.38% |
| Best 30-day return | +33.05% |
Trading Pattern
InsiderAlpha's records for William M. Sheriff go back to 2025: 11 primary Form 4 filings, an average of 5.5 per year. The typical open-market purchase is $34K (6 buys totaling $206K). The largest single buy on record is $74K of EU in 2026. Sales side: 9 recorded sales totaling $370K, so the filing history runs sell-heavy by dollar value. 10 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies William M. Sheriff files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- William B. Harris - $273K of EU open-market activity in the last 12 months
- Dennis Stover - $137K of EU open-market activity in the last 12 months
- Mark S. Pelizza - $137K of EU open-market activity in the last 12 months
- Richard H. Little - $64K of EU open-market activity in the last 12 months
- Wayne W. Heili - $50K of EU open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is William M. Sheriff?
William M. Sheriff is a corporate insider, tracked as Executive Chairman, Director of enCore Energy Corp. (EU). InsiderAlpha holds 11 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has William M. Sheriff submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has William M. Sheriff been buying or selling stock?
Recorded transactions: 6 open-market purchases ($206K) and 9 open-market sales ($370K) across all tracked filings.
How accurate is William M. Sheriff's historical track record?
Across 6 tracked purchases, William M. Sheriff averaged +23.3% avg 30-day return with a 100% 30-day win rate. InsiderAlpha rates the track record at 5/5 stars.
Where can I see all of William M. Sheriff's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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