Herndon Mark — Insider Stock Purchases
Chief Financial Officer. Every open-market stock purchase by Herndon Mark that we've tracked from SEC Form 4 filings, scored on our six-factor model. Not financial advice.
Tracked buys
2
Total value
$5,427
Most recent
May 20, 2026
| Ticker | Insider | Role | Value | Filed | Signal | Score |
|---|---|---|---|---|---|---|
| HKHC Horizon Kinetics Holding Corp | Herndon Mark | Chief Financial Officer | $2,785 | May 21, 2026 | WATCH | 48 |
| HKHC Horizon Kinetics Holding Corp | Herndon Mark | Chief Financial Officer | $2,642 | Mar 19, 2026 | WATCH | 55 |
About this profile
This page collects open-market share purchases disclosed by Herndon Mark in SEC Form 4 filings. When an insider buys with personal money on the open market, it is the cleanest conviction signal available — far more informative than a sale.
Each purchase is scored with our six-factor methodology. To see how these signals performed against the S&P 500, view the track record, or browse all tracked insiders on the insiders directory.
Not financial advice. For educational purposes only. Form 4 data can be amended or filed late; analysis is generated using AI and may contain errors.
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