Herndon Mark
Chief Financial Officer
Herndon Mark has filed 4 SEC Form 4 filings (5 transaction rows) across 1 company, with disclosures dating back to 2025. 4 of those filings fall inside the rolling window. Most recent filing: Aug 20, 2026.
On the most recent filing, Herndon Mark is listed as Chief Financial Officer at Horizon Kinetics Holding Corp. Inside the rolling window, Herndon Mark reported 5 open-market purchases totaling $15K in HKHC and no open-market sales. The largest disclosed transaction in the window is a purchase of 200 HKHC shares on Aug 20, 2026, worth $5K.
Companies traded
Other insiders at HKHC
Insider Buying
$15K
reported purchases (SEC code P)
Insider Selling
$0
reported sales (SEC code S)
Companies
1
in the rolling window
Frequently asked questions
How many SEC Form 4 filings has Herndon Mark made?
Herndon Mark has filed 4 SEC Form 4 filings (5 transaction rows) across 1 company since 2025.
Which companies does Herndon Mark trade?
Herndon Mark has filed SEC Form 4 disclosures for 1 company, including HKHC.
When was Herndon Mark's most recent SEC Form 4 filing?
Herndon Mark's most recent SEC Form 4 filing on Tracefour is dated Aug 20, 2026.
What is Herndon Mark's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Herndon Mark is listed as Chief Financial Officer.
What is Herndon Mark's total buy and sell value in the current window?
Inside the rolling retention window, Herndon Mark bought $15K and sold $0 based on SEC Form 4 filings.
What was Herndon Mark's largest disclosed transaction?
The largest disclosed transaction in the current window is a purchase of 200 HKHC shares on 2026-08-20, worth $5K, per SEC Form 4 filings.