Summary
Updated Aug 31, 2026
David M. Arndt is President, Cons Prod Div. of Horizon Kinetics Holding Corp (HKHC). 1 SEC Form 4 filing on record, dated 15 October 2025.
Trading Pattern
InsiderAlpha's records for David M. Arndt go back to 2025: 1 primary Form 4 filing, an average of 0.5 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 David M. Arndt 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 David M. Arndt?
David M. Arndt is a corporate insider, tracked as President, Cons Prod Div. of Horizon Kinetics Holding Corp (HKHC). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did David M. Arndt last file a Form 4?
The only primary Form 4 on record is dated 15 October 2025.
Where can I see all of David M. Arndt'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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