Mark Herndon

This profile gathers the share dealings of Mark Herndon across 2 companies, led by Horizon Kinetics Holding Corp and Safeguard Scientifics Inc. We count 7 filings; the first trade dates from 17 January 2022 and the latest from 20 August 2026.

On the market, this insider has only ever bought: 5 purchases, €11k in total. Buying on the open market means paying the going price with one's own funds, a different act from receiving shares as pay. The rest of the record consists of 2 share grants. Since January 2026: 3 purchases and no sales on the market.

In size, the median ticket on the buying side is €2,290. Of 5 purchases, 3 formed part of a group of insiders buying within 30 days of each other. Such overlaps are known as a cluster signal: distinct people reaching the same decision at about the same time.

On 20 August 2026 came the latest disclosure, an open-market purchase for €4,579 in Horizon Kinetics Holding Corp. Typically, a trade is published a median of 1 day after it takes place. The legal deadline for a Form 4 is two business days after the transaction. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.