STOCK TITAN

Horizon Kinetics CFO buys 250 shares at $26.50–26.75

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Horizon Kinetics Holding Corp (HKHC) reported that its Chief Financial Officer, Mark Herndon, purchased company common stock in the open market. He bought 50 shares on 2026-08-19 at $26.50 per share and 200 shares on 2026-08-20 at $26.75 per share, all held directly. The Rule 10b5-1 trading-plan checkbox was left unchecked.

Positive

  • None.

Negative

  • None.
Insider Herndon Mark
Role Chief Financial Officer
Bought 250 shs ($7K)
Type Security Shares Price Value
Purchase Common Stock 200 $26.75 $5K
Purchase Common Stock 50 $26.50 $1K
Holdings After Transaction: Common Stock — 550 shares (Direct)
Shares purchased 2026-08-19 50 shares Common Stock purchased by CFO Mark Herndon at $26.50 per share
Price 2026-08-19 $26.50 per share Open-market purchase price for 50 Common Stock shares
Shares purchased 2026-08-20 200 shares Common Stock purchased by CFO Mark Herndon at $26.75 per share
Price 2026-08-20 $26.75 per share Open-market purchase price for 200 Common Stock shares
Total shares bought 250 shares Aggregate net shares purchased across both reported transactions
Form 4 regulatory
"INSIDER FILING DATA (Form 4): { "issuerName": "Horizon Kinetics Holding Corp""
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.
Rule 10b5-1 regulatory
"aff_10b5_one is the filing's document-level Rule 10b5-1 checkbox: true = transactions 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.
beneficial ownership regulatory
"Footnotes may indicate: - Whether the reporting person has voting/investment authority over the shares - Any disclaimers of beneficial ownership"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
open market or private transaction financial
""transaction_code_description": "Purchase in open market or private transaction""

FAQ

What insider buying did HKHC disclose in this Form 4?

Horizon Kinetics Holding Corp (HKHC) disclosed that CFO Mark Herndon purchased a total of 250 common shares in two open-market transactions on 2026-08-19 and 2026-08-20 at prices between $26.50 and $26.75 per share.

How many HKHC shares did the CFO buy and at what prices?

CFO Mark Herndon bought 50 HKHC shares at $26.50 on 2026-08-19 and 200 shares at $26.75 on 2026-08-20. All purchases were of common stock and are reported as directly owned.

Were the HKHC insider purchases made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is marked false, indicating the reported HKHC transactions were not affirmed as made under a pre-arranged trading plan, based on the document-level disclosure of the 10b5-1 status.

Did the HKHC Form 4 report any insider sales of stock?

No. The Form 4 for HKHC shows two purchase transactions and no reported sales. The transaction summary indicates a net-buy direction, with 250 shares purchased and zero shares sold in the reported period.

What type of security did the HKHC insider buy in these transactions?

The insider transactions reported for HKHC involve purchases of Common Stock. Both entries list the security title as common stock, with no derivative securities reported in the derivative section of the filing for these specific transactions.

Is there any information on derivative positions in this HKHC Form 4?

No derivative transactions or positions are listed for this HKHC filing. The derivativeSummary is empty, and both reported trades involve only non-derivative Common Stock, so the disclosure focuses solely on direct share purchases.

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

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SEC Form 4
FORM 4UNITED 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)
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/19/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/19/2026P50A$26.5350D
Common Stock08/20/2026P200A$26.75550D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
/s/ Jay Kesslen, attorney-in-fact08/20/2026
** Signature of Reporting PersonDate
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)