Summary
Updated Aug 31, 2026
Alun Williams is Chief Operating Officer of Horizon Kinetics Holding Corp (HKHC). 1 SEC Form 4 filing on record, dated 20 November 2024. Most recent open-market trade: bought $2K of HKHC on 20 November 2024. Lifetime open-market purchases: $2K.
Recent Transactions
1Every recent SEC Form 4 transaction Alun Williams has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Alun Williams go back to 2024: 1 primary Form 4 filing, an average of 0.3 per year. The typical open-market purchase is $2K (1 buy totaling $2K). The largest single buy on record is $2K of HKHC in 2024. 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 Alun Williams 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.
- Brent D. Rosenthal - $118K of HKHC open-market activity in the last 12 months
- Murray Stahl - $18K of HKHC open-market activity in the last 12 months
- Alice C. Brennan - $16K of HKHC open-market activity in the last 12 months
- Mark Herndon - $15K of HKHC open-market activity in the last 12 months
- Daniel J. Roller - $13K of HKHC open-market activity in the last 12 months
- Allison Nagelberg - $5K of HKHC 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 Alun Williams?
Alun Williams is a corporate insider, tracked as Chief Operating Officer of Horizon Kinetics Holding Corp (HKHC). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Alun Williams last file a Form 4?
The only primary Form 4 on record is dated 20 November 2024.
Has Alun Williams been buying or selling stock?
Recorded transactions: 1 open-market purchase ($2K) and 0 open-market sales across all tracked filings.
Where can I see all of Alun Williams'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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