Brent D. Rosenthal is Director at Horizon Kinetics Holding Corp (HKHC). They have made 10 open-market trades across 2 companies since 2024, most recently 2026-08-24.
10 open-market purchases totalling $271K since 2024, never a sale. Across 7 scored buys the stock is up 7.4% at ninety days, and 2.6 points ahead of the S&P over the same stretch.
8 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| PBI | 17,755 | $303K |
| SCOR | 54,897 | $195K |
| HKHC | 4,450 | $147K |
| Total | $645K |
Shares reported on the most recent Form 4, priced at the 2026-08-25 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 63% | 86% | 86% |
| Avg Move | +0.0% | +2.2% | +7.4% |
| Alpha | -2.3% | -0.1% | +2.6% |
| Scored | 8 | 7 | 7 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| HKHC | BUY | 2026-08-24 | 2026-08-25 | $27.00 | $54K | N/A | N/A | — |
| HKHC | BUY | 2026-05-20 | 2026-05-21 | $27.85 | $19K | N/A | N/A | N/A |
| HKHC | BUY | 2026-03-18 | 2026-03-19 | $33.05 | $25K | -2.6% | N/A | N/A |
| PBI | BUY | 2026-03-13 | 2026-03-17 | $10.23 | $82K | +4.7% | +17.2% | +66.0% |
| PBI | BUY | 2025-11-25 | 2025-11-25 | $10.00 | $20K | -0.8% | +8.3% | +4.6% |
| HKHC | BUY | 2025-11-25 | 2025-11-26 | $27.28 | $8K | +2.1% | +0.6% | +0.6% |
| PBI | BUY | 2025-09-03 | 2025-09-05 | $11.97 | $36K | -9.4% | -12.3% | -21.4% |
| HKHC | BUY | 2025-09-02 | 2025-09-03 | $38.00 | $11K | +2.1% | +0.6% | +0.6% |
| HKHC | BUY | 2024-11-19 | 2024-11-20 | $37.06 | $4K | +2.1% | +0.6% | +0.6% |
| HKHC | BUY | 2024-11-14 | 2024-11-15 | $38.06 | $11K | +2.1% | +0.6% | +0.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.