Horizon Kinetics (HKHC) CFO adds 100 shares in open-market buy

Rhea-AI Filing Summary

Horizon Kinetics Holding Corp Chief Financial Officer Mark Herndon bought 100 shares of common stock in an open-market transaction at $27.85 per share. After this purchase, he directly holds 300 common shares of Horizon Kinetics Holding Corp.

Insider Trade Summary

Net Buyer: 100 shares ($2,785)

Net Buy 1 txn

Insider Herndon Mark

Role Chief Financial Officer

Bought 100 shs ($3K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	100	$27.85	$3K

Holdings After Transaction: Common Stock — 300 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 100 shares Purchase price: $27.85 per share Shares held after transaction: 300 shares +1 more

4 metrics

Shares purchased 100 shares Open-market purchase on 2026-05-20

Purchase price $27.85 per share Price paid for HKHC common stock

Shares held after transaction 300 shares Direct holdings of CFO after purchase

Net shares bought 100 shares Net buy activity in this Form 4

Key Terms

open-market purchase, Common Stock, Form 4, transaction code P

4 terms

open-market purchase financial

"transaction_action: "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

transaction code P regulatory

"transaction_code_description: "Purchase in open market or private transaction""

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^*

Herndon Mark

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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	05/20/2026		P		100	A	$27.85	300	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	05/21/2026
	** 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 its CFO?

Horizon Kinetics reported that CFO Mark Herndon purchased 100 shares of common stock in an open-market transaction. The shares were bought at $27.85 each, and the transaction was disclosed in a Form 4 insider trading report.

At what price did the Horizon Kinetics (HKHC) CFO buy shares?

The CFO bought Horizon Kinetics common stock at $27.85 per share. This price reflects the cost of the 100 shares acquired in the open market and is the only transaction price disclosed in the Form 4 filing.

How many Horizon Kinetics (HKHC) shares does the CFO hold after this trade?

Following the reported transaction, CFO Mark Herndon directly holds 300 shares of Horizon Kinetics common stock. This figure includes the 100 shares purchased in the open-market transaction detailed in the Form 4 filing.

Was the Horizon Kinetics (HKHC) CFO’s transaction a purchase or a sale?

The transaction was a purchase of shares by the CFO. The Form 4 identifies the code as “P,” which corresponds to an open-market or private purchase of common stock rather than a sale or other type of disposition.

What does the Form 4 transaction code P mean for Horizon Kinetics (HKHC)?

Transaction code P on the Horizon Kinetics Form 4 indicates an open-market or private purchase. In this case, it confirms the CFO bought 100 common shares, rather than exercising options, gifting shares, or disposing of stock through another mechanism.