12 insiders reported 322 Form 4 transactions for Horizon Kinetics Holding Corp (HKHC) over the past 18 months (most recent 2026-08-20). Recent activity: Herndon Mark (Chief Financial Officer) Buy 50 shares, Herndon Mark (Chief Financial Officer) Buy 200 shares, Rosenthal Brent D (Director) Buy 700 shares, Herndon Mark (Chief Financial Officer) Buy 100 shares, Horizon Common Inc (Insider) Buy 25 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-20 | Herndon Mark | Chief Financial Officer | Buy | 50 | $1,325 |
| 2026-08-20 | Herndon Mark | Chief Financial Officer | Buy | 200 | $5,350 |
| 2026-05-21 | Rosenthal Brent D | Director | Buy | 700 | $19,495 |
| 2026-05-21 | Herndon Mark | Chief Financial Officer | Buy | 100 | $2,785 |
| 2026-03-24 | Horizon Common Inc | Insider | Buy | 25 | $865 |
| 2026-03-24 | STAHL MURRAY | CEO and CIO | Buy | 10 | $346 |
| 2026-03-24 | Horizon Common Inc | Insider | Buy | 25 | $865 |
| 2026-03-24 | STAHL MURRAY | CEO and CIO | Buy | 25 | $865 |
| 2026-03-24 | Horizon Common Inc | Insider | Buy | 18 | $623 |
| 2026-03-24 | STAHL MURRAY | CEO and CIO | Buy | 18 | $623 |
| 2026-03-24 | Horizon Common Inc | Insider | Buy | 10 | $346 |
| 2026-03-24 | STAHL MURRAY | CEO and CIO | Buy | 10 | $346 |
| 2026-03-24 | Horizon Common Inc | Insider | Buy | 10 | $346 |
| 2026-03-24 | STAHL MURRAY | CEO and CIO | Buy | 25 | $865 |
| 2026-03-24 | Horizon Common Inc | Insider | Buy | 18 | $623 |
| 2026-03-24 | STAHL MURRAY | CEO and CIO | Buy | 18 | $623 |
| 2026-03-23 | Nagelberg Allison | Director | Buy | 150 | $5,094 |
| 2026-03-20 | Horizon Common Inc | Insider | Buy | 46 | $1,567 |
| 2026-03-20 | STAHL MURRAY | CEO and CIO | Buy | 46 | $1,567 |
| 2026-03-20 | Horizon Common Inc | Insider | Buy | 25 | $852 |
| 2026-03-20 | STAHL MURRAY | CEO and CIO | Buy | 25 | $852 |
| 2026-03-20 | Horizon Common Inc | Insider | Buy | 18 | $613 |
| 2026-03-20 | STAHL MURRAY | CEO and CIO | Buy | 18 | $613 |
| 2026-03-19 | Rosenthal Brent D | Director | Buy | 750 | $24,787 |
| 2026-03-19 | STAHL MURRAY | CEO and CIO | Buy | 10 | $340 |
Source: SEC Form 4 filings · as of 2026-08-20