Summary
Updated Aug 31, 2026
William J. Sandbrook is Director of Knife River Corp (KNF). 6 SEC Form 4 filings on record going back to 2025, most recently on 21 May 2026. Most recent open-market trade: sold $3.61M of FIX on 26 February 2026. Lifetime open-market sales: $5.17M.
Recent Transactions
8Every recent SEC Form 4 transaction William J. Sandbrook has reported, most recent first.
Trading Pattern
InsiderAlpha's records for William J. Sandbrook go back to 2025: 6 primary Form 4 filings, an average of 3.0 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies William J. Sandbrook 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.
- Brian E. Lane - $68.05M of FIX open-market activity in the last 12 months
- Franklin Myers - $52.10M of FIX open-market activity in the last 12 months
- William George III - $31.67M of FIX open-market activity in the last 12 months
- Darcy Anderson - $10.00M of FIX open-market activity in the last 12 months
- Julie Shaeff - $5.41M of FIX open-market activity in the last 12 months
- Pablo G. Mercado, - $4.11M of FIX 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 J. Sandbrook?
William J. Sandbrook is a corporate insider, tracked as Director of Knife River Corp (KNF). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did William J. Sandbrook last file a Form 4?
The most recent primary Form 4 on record is dated 21 May 2026, one of 6 filings going back to 2025.
Has William J. Sandbrook been buying or selling stock?
Recorded transactions: 0 open-market purchases and 5 open-market sales ($5.17M) across all tracked filings.
Where can I see all of William J. Sandbrook'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.
Learn More
Follow William J. Sandbrook and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial