Horizon Kinetics director buys 190 shares at $26.27

A Horizon Kinetics Holding Corp director reported an open-market purchase of HKHC common stock, modestly increasing her direct holdings.

Rhea-AI Filing Summary

Horizon Kinetics Holding Corp (HKHC) director Allison Nagelberg purchased common stock in an open-market or private transaction. On September 18, 2026, she bought 190 shares of common stock at $26.27 per share, bringing her direct holdings to 590 shares after the transaction. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Net Buyer: 190 shares

Net Buy 1 txn

Insider Nagelberg Allison

Role Director

Bought 190 shs ($5K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	190	$26.27	$5K

Holdings After Transaction: Common Stock — 590 shares (Direct)

Key Figures

Shares purchased: 190 shares Purchase price per share: $26.27 per share Shares owned after transaction: 590 shares

3 metrics

Shares purchased 190 shares Common Stock purchased on September 18, 2026

Purchase price per share $26.27 per share Common Stock transaction on September 18, 2026

Shares owned after transaction 590 shares Director’s direct holdings following the September 18, 2026 purchase

Key Terms

Common Stock, Purchase in open market or private transaction, Rule 10b5-1

3 terms

Common Stock financial

"security titled "Common Stock" was purchased in the transaction"

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.

Purchase in open market or private transaction financial

"transaction was a "Purchase in open market or private transaction""

Rule 10b5-1 regulatory

"a Rule 10b5-1 trading plan checkbox appears but is not affirmed"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did HKHC director Allison Nagelberg report?

She reported a purchase of 190 shares of Horizon Kinetics Holding Corp common stock on September 18, 2026 at $26.27 per share in an open-market or private transaction.

How many HKHC shares does the director own after this Form 4 transaction?

After the reported transaction, Allison Nagelberg directly owns 590 shares of Horizon Kinetics Holding Corp common stock, according to the Form 4 disclosure.

Was the HKHC insider purchase made under a Rule 10b5-1 trading plan?

No. The filing indicates the Rule 10b5-1 checkbox is not affirmed, so the reported 190-share purchase was not identified as made under a Rule 10b5-1 trading plan.

What price did the HKHC director pay for the purchased shares?

The reported purchase price was $26.27 per share for 190 shares of Horizon Kinetics Holding Corp common stock acquired on September 18, 2026.

What type of HKHC security did the insider acquire in this Form 4?

The insider acquired Common Stock of Horizon Kinetics Holding Corp, purchasing 190 shares in an open-market or private transaction at $26.27 per share.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/22/2026 - 09:29 AM Accepted by SEC EDGAR 09/22/2026 - 09:28 AM Learn about SEC filing dates

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^*

Nagelberg Allison

(Last) (First) (Middle)

C/O HORIZON KINETICS LLC

1270 AVENUE OF THE AMERICAS 27TH FLOOR

(Street)

NEW YORK NEW YORK 10020

(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)
09/18/2026

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	09/18/2026		P		190	A	$26.27	590	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	09/22/2026
	** 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)