Filings Radar

SEC 8-K and 6-K filings classified by Claude with reasoning, plus Form 4 insider transactions. Ingested from EDGAR’s filing stream in near-real time, reconciled overnight.

Horizon Kinetics Holding Corp (HKHC)

CIK 0000088000 0 material events

Insider activity (SEC Form 4)

Open-market buys and sells only — the deliberate trades. Zero here doesn’t mean no filings: grants, option exercises and tax withholding (below) are compensation, not market trades.

Open-market · last 30 days: 4 buyers bought $100K 0 sellers sold $0
Open-market · last 90 days: 4 buyers bought $100K 0 sellers sold $0
InsiderRoleDateTransactionSharesValue
Brennan Alice C Director 2026-09-02 Open-market buy 200 $5K
Brennan Alice C Director 2026-08-28 Open-market buy 200 $5K
Brennan Alice C Director 2026-08-27 Open-market buy 200 $5K
Roller Daniel J Director 2026-08-26 Open-market buy 500 $13K
Brennan Alice C Director 2026-08-25 Open-market buy 200 $5K
Brennan Alice C Director 2026-08-24 Open-market buy 200 $5K
Rosenthal Brent D Director 2026-08-24 Open-market buy 2000 $54K
Herndon Mark Chief Financial Officer 2026-08-20 Open-market buy 200 $5K
Herndon Mark Chief Financial Officer 2026-08-19 Open-market buy 50 $1K
Herndon Mark Chief Financial Officer 2026-05-20 Open-market buy 100 $3K
Rosenthal Brent D Director 2026-05-20 Open-market buy 700 $19K
Nagelberg Allison Director 2026-03-20 Open-market buy 150 $5K
STAHL MURRAY CEO and CIO, Director, 10% Owner 2026-03-20 Open-market buy 10 $346
STAHL MURRAY CEO and CIO, Director, 10% Owner 2026-03-20 Open-market buy 25 $865
STAHL MURRAY CEO and CIO, Director, 10% Owner 2026-03-20 Open-market buy 18 $623
STAHL MURRAY CEO and CIO, Director, 10% Owner 2026-03-19 Open-market buy 46 $2K
STAHL MURRAY CEO and CIO, Director, 10% Owner 2026-03-19 Open-market buy 25 $852
STAHL MURRAY CEO and CIO, Director, 10% Owner 2026-03-19 Open-market buy 18 $613
Herndon Mark Chief Financial Officer 2026-03-18 Open-market buy 80 $3K
Rosenthal Brent D Director 2026-03-18 Open-market buy 750 $25K
Most recent 20 reported transactions. Open-market buys (P) and sells (S) are the deliberate ones; grants and option exercises are compensation. Not investment advice.

We track this company, but none of its filings have been classified as material yet. New filings land after EDGAR’s nightly publish (~10 PM ET).