v3.25.4
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 09, 2026
Jun. 30, 2025
Cover [Abstract]        
Entity Registrant Name HORIZON KINETICS HOLDING CORPORATION      
Entity Central Index Key 0000088000      
Document Type 10-K      
Document Period End Date Dec. 31, 2025      
Document Annual Report true      
Document Transition Report false      
Amendment Flag false      
Document Fiscal Year Focus 2025      
Document Fiscal Period Focus FY      
Current Fiscal Year End Date --12-31      
Entity Filer Category Non-accelerated Filer      
Entity Small Business true      
Entity Emerging Growth Company false      
Entity Common Stock, Shares Outstanding     18,635,321  
Entity Interactive Data Current Yes      
Entity Shell Company false      
Entity File Number 001-13458      
Entity Incorporation, State or Country Code DE      
Entity Tax Identification Number 84-0920811      
Entity Address, Address Line One 470 Park Ave S      
Entity Address, City or Town New York      
Entity Address, State or Province NY      
Entity Address, Postal Zip Code 10016      
City Area Code 646      
Local Phone Number 291-2300      
Title of 12(g) Security Common Stock, $0.10 Par Value      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Document Financial Statement Error Correction false      
ICFR Auditor Attestation Flag false      
Entity Public Float       $ 370,353,889
Auditor Name CBIZ CPAs P.C. Marcum llp    
Auditor Location Costa Mesa, CA Costa Mesa, California    
Auditor Firm ID 199 688    
Auditor opinion

Opinion on the Financial Statements

 

We have audited the accompanying consolidated statements of financial condition of Horizon Kinetics Holding Corporation (the “Company”) as of December 31, 2025, the related consolidated statements of operations, shareholders’ equity and cash flows for the year ended December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025, and the results of its operations and its cash flows for the year ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.

We have audited the accompanying consolidated statement of financial condition of Horizon Kinetics Holding Corporation (the “Company”) as of December 31, 2024, the related consolidated statements of operations, shareholders’ equity and cash flows for the year ended December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024, and the results of its operations and its cash flows for the year ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.