X0609 4/A 2026-03-20 2026-03-24 0 0000088000 Horizon Kinetics Holding Corp HKHC 0001207097 STAHL MURRAY false 470 PARK AVENUE SOUTH 8TH FLOOR SOUTH NEW YORK NY 10016 1 1 1 0 CEO and CIO 0002033370 Horizon Common Inc false 470 PARK AVENUE SOUTH 8TH FLOOR SOUTH NEW YORK NY 10016 0 0 1 0 0 Common Stock 2026-03-20 4 P 0 10 34.6 A 249204 D Common Stock 2026-03-20 4 P 0 25 34.6 A 8216801 I Horizon Common Inc. Common Stock 2026-03-20 4 P 0 18 34.6 A 135 I Horizon Kinetics Hard Assets, LLC Common Stock 5 I Spouse Common Stock 823923 I FRMO Corp. Common Stock 6900 I Kinetics Institutional Partners LP Common Stock 5810 I Kinetics Partners LP Common Stock 952 I Horizon Kinetics Asset Management LLC The number of securities beneficially owned following the reported transaction was previously overstated. This amendment corrects the ownership amount to reflect the accurate number of securities beneficially owned after the transaction. Mr. Stahl serves as the Chief Executive Officer and Chief Investment Strategist for Horizon Kinetics Asset Management LLC, a wholly owned subsidiary of Horizon Kinetics Holding Corporation (HKHC), and also serves as the Chief Executive Officer of Horizon Common, Inc. (HCI), a large shareholder of HKHC. Mr. Stahl exercises discretion over shares of the Issuer held by HKHC and HCI and disclaims beneficial ownership except to the extent of his pecuniary interest. Mr. Stahl serves as the Chief Executive Officer for FRMO Corp. (FRMO) and exercises discretion over shares of the Issuer. He disclaims beneficial ownership except to the extent of his pecuniary interest. The reported ownership includes shares held by Fromex Corp., a wholly owned subsidiary of FRMO. /s/ Jay Kesslen, attorney-in-fact 2026-03-24