Mark Herndon insider trades: Horizon Kinetics Holding (HKHC) stock purchases
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Mark reports to the SEC
Open-market buys and sales
7 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 20, 2026 | HKHC | ↑ Buy | 250 | $26.70 | $7K | Direct | Aug 20, 2026 (0d) |
| May 20, 2026 | HKHC | ↑ Buy | 100 | $27.85 | $3K | Direct | May 21, 2026 (1d) |
| Mar 18, 2026 | HKHC | ↑ Buy | 80 | $33.03 | $3K | Direct | Mar 19, 2026 (1d) |
| Nov 20, 2025 | HKHC | ↑ Buy | 100 | $29.00 | $3K | Direct | Nov 21, 2025 (1d) |
| Jun 4, 2025 | HKHC | ↑ Buy | 20 | $40.18 | $804 | Direct | Jun 5, 2025 (1d) |
| May 6, 2020 | SFE | ↑ Buy | 2,000 | $6.25 | $13K | Direct | May 7, 2020 (1d) |
| Dec 7, 2018 | SFE | ↑ Buy | 10,000 | $9.44 | $94K | Direct | Dec 10, 2018 (3d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other HKHC insiders
Open-market trades in the last 12 months
About Mark Herndon's insider trades
Mark Herndon is Chief Financial Officer at Horizon Kinetics Holding (HKHC). Since Dec 7, 2018, Mark has reported 7 open-market purchases worth $123K and no sales on SEC Form 4. In the last 12 months: 4 buys ($15K).
Their filings also include grants and awards (4 filings), shares withheld for taxes (3 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every HKHC insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.