12 insiders reported 320 Form 4 transactions for Horizon Kinetics Holding Corp (HKHC) over the past 18 months (most recent 2026-05-21). Recent activity: Rosenthal Brent D (Director) Buy 700 shares, Herndon Mark (Chief Financial Officer) Buy 100 shares, Horizon Common Inc (Insider) Buy 10 shares, STAHL MURRAY (CEO and CIO) Buy 10 shares, Horizon Common Inc (Insider) Buy 25 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 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 | 10 | $346 |
| 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 | 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 |
| 2026-03-23 | 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 | Horizon Common Inc | Insider | Buy | 10 | $340 |
| 2026-03-19 | STAHL MURRAY | CEO and CIO | Buy | 10 | $340 |
| 2026-03-19 | Horizon Common Inc | Insider | Buy | 9 | $306 |
Source: SEC Form 4 filings · as of 2026-05-21