Horizon Kinetics (HKHC) director Brent Rosenthal buys 750 shares in open market

Rhea-AI Filing Summary

Horizon Kinetics Holding Corp director Brent D. Rosenthal made an open-market purchase of common stock. On March 18, 2026, he bought 750 shares at a price of $33.05 per share. After this transaction, he directly owns 1,750 common shares of the company.

Insider Trade Summary

Net Buyer: 750 shares ($24,787)

Net Buy 1 txn

Insider Rosenthal Brent D

Role Director

Bought 750 shs ($25K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	750	$33.05	$25K

Holdings After Transaction: Common Stock — 1,750 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Rosenthal Brent D

(Last) (First) (Middle)

470 PARK AVENUE SOUTH

8TH FLOOR SOUTH

(Street)

NEW YORK NEW YORK 10016

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Horizon Kinetics Holding Corp [ HKHC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/18/2026		P		750	A	$33.05	1,750	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Jay Kesslen, attorney-in-fact	03/19/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Horizon Kinetics (HKHC) report for Brent D. Rosenthal?

Horizon Kinetics reported that director Brent D. Rosenthal made an open-market purchase of company stock. He bought 750 shares of common stock, increasing his direct holdings to 1,750 shares following the transaction.

How many Horizon Kinetics (HKHC) shares did Brent D. Rosenthal buy and at what price?

Brent D. Rosenthal purchased 750 shares of Horizon Kinetics common stock. The open-market purchase was executed at a price of $33.05 per share, according to the Form 4 insider trading report.

What are Brent D. Rosenthal’s total Horizon Kinetics (HKHC) holdings after this Form 4 transaction?

Following the reported transaction, Brent D. Rosenthal directly owns 1,750 shares of Horizon Kinetics common stock. This figure reflects his position after purchasing 750 shares in the open market at $33.05 per share.

Was the Horizon Kinetics (HKHC) insider transaction a buy or a sell?

The Form 4 shows a buy transaction by director Brent D. Rosenthal. He completed an open-market purchase, acquiring 750 Horizon Kinetics common shares at a price of $33.05 per share on March 18, 2026.

What type of transaction is reported in the Horizon Kinetics (HKHC) Form 4 filing?

The filing reports a non-derivative open-market purchase of common stock by a director. Brent D. Rosenthal acquired 750 shares at $33.05 each, bringing his direct ownership in Horizon Kinetics Holding Corp to 1,750 shares.