Summary
Updated Aug 31, 2026
Allison Nagelberg is Director of Horizon Kinetics Holding Corp (HKHC). 2 SEC Form 4 filings on record going back to 2024, most recently on 23 March 2026. Most recent open-market trade: bought $5K of HKHC on 23 March 2026. Lifetime open-market purchases: $7K.
Recent Transactions
2Every recent SEC Form 4 transaction Allison Nagelberg has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Allison Nagelberg 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
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Allison Nagelberg?
Allison Nagelberg is a corporate insider, tracked as Director of Horizon Kinetics Holding Corp (HKHC). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Allison Nagelberg last file a Form 4?
The most recent primary Form 4 on record is dated 23 March 2026, one of 2 filings going back to 2024.
Has Allison Nagelberg been buying or selling stock?
Recorded transactions: 2 open-market purchases ($7K) and 0 open-market sales across all tracked filings.
Where can I see all of Allison Nagelberg'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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