Horizon Kinetics Asset Management LLC (HKHC) Insider Trading

Cluster buy

4 insiders bought $92k of their own stock in 30 days.

Open-market purchases by executives and directors between Aug 20 and Sep 18. Buying is rarer than selling and says more, but it is one input, not a verdict.

Net open-market

+$164k

23 buys · 0 sales

Under a 10b5-1 plan

—

no sales

Insiders who bought / sold

5 / 0

executives and directors

Last open-market buy

Sep 2026

Sep 18, 2026

Get an email when HKHC's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Sep 18	Allison Nagelberg Director	Bought	190	$26.27	$5k	48%	Form 4
Sep 2	Alice C Brennan Director	Bought	200	$25.92	$5k	11%	Form 4
Aug 28	Alice C Brennan Director	Bought	200	$26.20	$5k	13%	Form 4
Aug 27	Alice C Brennan Director	Bought	200	$26.00	$5k	14%	Form 4
Aug 26	Maran Capital Management, LLC Large holder	Bought	500	$26.50	$13k	0.2%	Form 4
Aug 25	Alice C Brennan Director	Bought	200	$26.75	$5k	17%	Form 4
Aug 24	Alice C Brennan Director	Bought	200	$26.87	$5k	20%	Form 4
Aug 24	Brent D Rosenthal Director	Bought	2,000	$27.00	$54k	82%	Form 4
Aug 19 – 20	Mark Herndon Chief Financial Officer	Bought 2 parts	250	$26.70 average	$7k	83%	Form 4
May 20	Mark Herndon Chief Financial Officer	Bought	100	$27.85	$3k	50%	Form 4
May 20	Brent D Rosenthal Director	Bought	700	$27.85	$19k	40%	Form 4
Mar 20	Murray Stahl CEO and CIO	Bought 3 parts	53	$34.60 average	$2k	<0.1%	Form 4
Mar 20	Horizon Common Inc Large holder	Bought 3 parts	53	$34.60 average	$2k	<0.1%	Form 4
Mar 20	Allison Nagelberg Director	Bought	150	$33.96	$5k	60%	Form 4
Mar 19	Horizon Common Inc Large holder	Bought 3 parts	89	$34.06 average	$3k	<0.1%	Form 4
Mar 18	Horizon Common Inc Large holder	Bought 3 parts	27	$34.00 average	$918	<0.1%	Form 4
Mar 18	Mark Herndon Chief Financial Officer	Bought	80	$33.03	$3k	67%	Form 4
Mar 18	Brent D Rosenthal Director	Bought	750	$33.05	$25k	75%	Form 4
Dec 10, 2025	Murray Stahl CEO and CIO	Bought 3 parts	22	$27.00 average	$594	<0.1%	Form 4
Dec 9, 2025	Murray Stahl CEO and CIO	Bought 3 parts	22	$27.00 average	$594	<0.1%	Form 4
Dec 8, 2025	Horizon Common Inc Large holder	Bought 3 parts	22	$26.73 average	$588	<0.1%	Form 4
Dec 5, 2025	Murray Stahl CEO and CIO	Bought 3 parts	22	$27.75 average	$611	<0.1%	Form 4
Dec 4, 2025	Horizon Common Inc Large holder	Bought 3 parts	22	$27.75 average	$611	<0.1%	Form 4
Dec 3, 2025	Horizon Common Inc Large holder	Bought 3 parts	22	$27.00 average	$594	<0.1%	Form 4
Dec 2, 2025	Murray Stahl CEO and CIO	Bought 3 parts	22	$27.23 average	$599	<0.1%	Form 4
Dec 1, 2025	Horizon Common Inc Large holder	Bought 3 parts	22	$27.00 average	$594	<0.1%	Form 4
Nov 28, 2025	Murray Stahl CEO and CIO	Bought 3 parts	22	$27.23 average	$599	<0.1%	Form 4
Nov 26, 2025	Horizon Common Inc Large holder	Bought 3 parts	24	$27.23 average	$654	<0.1%	Form 4
Nov 25, 2025	Murray Stahl CEO and CIO	Bought 3 parts	24	$27.00 average	$648	<0.1%	Form 4
Nov 25, 2025	Brent D Rosenthal Director	Bought	300	$27.28	$8k	43%	Form 4
Nov 24, 2025	Murray Stahl CEO and CIO	Bought 3 parts	24	$28.00 average	$672	<0.1%	Form 4
Nov 21, 2025	Horizon Common Inc Large holder	Bought 3 parts	25	$28.25 average	$706	<0.1%	Form 4
Nov 20, 2025	Horizon Common Inc Large holder	Bought 3 parts	24	$27.50 average	$660	<0.1%	Form 4
Nov 20, 2025	Mark Herndon Chief Financial Officer	Bought	100	$29.00	$3k	500%	Form 4
Sep 9, 2025	Horizon Common Inc Large holder	Bought 4 parts	24	$38.30 average	$919	<0.1%	Form 4
Sep 8, 2025	Horizon Common Inc Large holder	Bought 4 parts	25	$38.85 average	$971	<0.1%	Form 4
Sep 5, 2025	Murray Stahl CEO and CIO	Bought 4 parts	23	$39.00 average	$897	<0.1%	Form 4
Sep 4, 2025	Murray Stahl CEO and CIO	Bought 4 parts	23	$39.45 average	$907	<0.1%	Form 4
Sep 3, 2025	Murray Stahl CEO and CIO	Bought 4 parts	23	$40.20 average	$925	<0.1%	Form 4
Sep 2, 2025	Murray Stahl CEO and CIO	Bought 4 parts	23	$38.00 average	$874	<0.1%	Form 4

Sep 18
Allison Nagelberg
Director · bought 190 at $26.27
$5k
48% of stake
Sep 2
Alice C Brennan
Director · bought 200 at $25.92
$5k
11% of stake
Aug 28
Alice C Brennan
Director · bought 200 at $26.20
$5k
13% of stake
Aug 27
Alice C Brennan
Director · bought 200 at $26.00
$5k
14% of stake
Aug 26
Maran Capital Management, LLC
Large holder · bought 500 at $26.50
$13k
0.2% of stake
Aug 25
Alice C Brennan
Director · bought 200 at $26.75
$5k
17% of stake
Aug 24
Alice C Brennan
Director · bought 200 at $26.87
$5k
20% of stake
Aug 24
Brent D Rosenthal
Director · bought 2,000 at $27.00
$54k
82% of stake
Aug 19 – 20
Mark Herndon
Chief Financial Officer · bought 250 at avg $26.70
$7k
83% of stake
May 20
Mark Herndon
Chief Financial Officer · bought 100 at $27.85
$3k
50% of stake
May 20
Brent D Rosenthal
Director · bought 700 at $27.85
$19k
40% of stake
Mar 20
Murray Stahl
CEO and CIO · bought 53 at avg $34.60
$2k
<0.1% of stake
Mar 20
Horizon Common Inc
Large holder · bought 53 at avg $34.60
$2k
<0.1% of stake
Mar 20
Allison Nagelberg
Director · bought 150 at $33.96
$5k
60% of stake
Mar 19
Horizon Common Inc
Large holder · bought 89 at avg $34.06
$3k
<0.1% of stake
Mar 18
Horizon Common Inc
Large holder · bought 27 at avg $34.00
$918
<0.1% of stake
Mar 18
Mark Herndon
Chief Financial Officer · bought 80 at $33.03
$3k
67% of stake
Mar 18
Brent D Rosenthal
Director · bought 750 at $33.05
$25k
75% of stake
Dec 10, 2025
Murray Stahl
CEO and CIO · bought 22 at avg $27.00
$594
<0.1% of stake
Dec 9, 2025
Murray Stahl
CEO and CIO · bought 22 at avg $27.00
$594
<0.1% of stake
Dec 8, 2025
Horizon Common Inc
Large holder · bought 22 at avg $26.73
$588
<0.1% of stake
Dec 5, 2025
Murray Stahl
CEO and CIO · bought 22 at avg $27.75
$611
<0.1% of stake
Dec 4, 2025
Horizon Common Inc
Large holder · bought 22 at avg $27.75
$611
<0.1% of stake
Dec 3, 2025
Horizon Common Inc
Large holder · bought 22 at avg $27.00
$594
<0.1% of stake
Dec 2, 2025
Murray Stahl
CEO and CIO · bought 22 at avg $27.23
$599
<0.1% of stake
Dec 1, 2025
Horizon Common Inc
Large holder · bought 22 at avg $27.00
$594
<0.1% of stake
Nov 28, 2025
Murray Stahl
CEO and CIO · bought 22 at avg $27.23
$599
<0.1% of stake
Nov 26, 2025
Horizon Common Inc
Large holder · bought 24 at avg $27.23
$654
<0.1% of stake
Nov 25, 2025
Murray Stahl
CEO and CIO · bought 24 at avg $27.00
$648
<0.1% of stake
Nov 25, 2025
Brent D Rosenthal
Director · bought 300 at $27.28
$8k
43% of stake
Nov 24, 2025
Murray Stahl
CEO and CIO · bought 24 at avg $28.00
$672
<0.1% of stake
Nov 21, 2025
Horizon Common Inc
Large holder · bought 25 at avg $28.25
$706
<0.1% of stake
Nov 20, 2025
Horizon Common Inc
Large holder · bought 24 at avg $27.50
$660
<0.1% of stake
Nov 20, 2025
Mark Herndon
Chief Financial Officer · bought 100 at $29.00
$3k
500% of stake
Sep 9, 2025
Horizon Common Inc
Large holder · bought 24 at avg $38.30
$919
<0.1% of stake
Sep 8, 2025
Horizon Common Inc
Large holder · bought 25 at avg $38.85
$971
<0.1% of stake
Sep 5, 2025
Murray Stahl
CEO and CIO · bought 23 at avg $39.00
$897
<0.1% of stake
Sep 4, 2025
Murray Stahl
CEO and CIO · bought 23 at avg $39.45
$907
<0.1% of stake
Sep 3, 2025
Murray Stahl
CEO and CIO · bought 23 at avg $40.20
$925
<0.1% of stake
Sep 2, 2025
Murray Stahl
CEO and CIO · bought 23 at avg $38.00
$874
<0.1% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch HKHC, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in HKHC's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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