Updated Jul 17, 2026
SHERIFF WILLIAM M has filed 1 SEC Form 4 filing across 1 company in the last 90 days — active on both sides. Lifetime open-market purchases: $206K. Lifetime open-market sales: $370K. Historical track record: 5/5 stars across 3 tracked purchases.
William M. Sheriff is the Executive Chairman of enCore Energy Corp, a company focused on the acquisition and exploration of uranium resource properties in the United States. He has been involved in the uranium industry and has held multiple roles within the company, contributing to its strategic direction.
| Role | Insider |
|---|---|
| Notability | 30/100 |
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realised performance after each tracked open-market purchase.
| InsiderAlpha rating | ★★★★★ (5/5) |
|---|---|
| Total purchases tracked | 3 |
| Purchases with forward-return data | 3 |
| 30-day win rate | 10000% |
| 90-day win rate | 10000% |
| Avg 5-day return | +0.00% |
| Avg 30-day return | +3305.08% |
| Avg 90-day return | +14406.78% |
| Best 30-day return | +3305.08% |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-20 | EU | enCore Energy Corp. | P — Open-market purchase | 25.0K | $1.47 | $37K |
| 2026-05-20 | EU | enCore Energy Corp. | P — Open-market purchase | 25.0K | $1.39 | $35K |
| 2026-05-20 | EU | enCore Energy Corp. | P — Open-market purchase | 50.0K | $1.49 | $74K |
| 2026-02-10 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 12.0K | $2.80 | $34K |
| 2026-02-10 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 12.0K | $2.72 | $33K |
| 2026-01-09 | EU | enCore Energy Corp. | S — Open-market sale | 10.0K | $2.81 | $28K |
| 2026-01-06 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 2.2K | $2.67 | $6K |
| 2026-01-06 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 16.3K | $2.68 | $44K |
| 2026-01-06 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 24.0K | $2.72 | $65K |
| 2026-01-02 | EU | enCore Energy Corp. | S — Open-market sale | 16.5K | $2.42 | $40K |
| 2025-12-18 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 24.0K | $2.37 | $57K |
| 2025-12-01 | EU | enCore Energy Corp. | S — Open-market sale [10b5-1] | 24.0K | $2.65 | $64K |
| 2025-04-03 | EU | enCore Energy Corp. | P — Open-market purchase | 10.0K | $1.21 | $12K |
| 2025-04-03 | EU | enCore Energy Corp. | P — Open-market purchase | 20.0K | $1.20 | $24K |
| 2025-04-03 | EU | enCore Energy Corp. | P — Open-market purchase | 20.0K | $1.22 | $24K |
William M. Sheriff is the Executive Chairman of enCore Energy Corp, a company focused on the acquisition and exploration of uranium resource properties in the United States. He has been involved in the uranium industry and has held multiple roles within the company, contributing to its strategic direction.…
1 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 6 open-market purchases ($206K) and 9 open-market sales ($370K) across all tracked filings.
Across 3 tracked purchases, SHERIFF WILLIAM M averaged +3305.1% avg 30-day return with a 10000% 30-day win rate. InsiderAlpha rates the track record at 5/5 stars.
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.
Open the live SHERIFF WILLIAM M profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.