X0508 4 2024-11-15 0000088000 Horizon Kinetics Holding Corp HKHC 0002033370 Horizon Common Inc 470 PARK AVENUE SOUTH 8TH FLOOR SOUTH NEW YORK NY 10016 1 0 Common Stock 2024-11-15 4 P 0 6 38.50 A 8216443 D Common Stock 2024-11-18 4 P 0 6 38.75 A 8216449 D Common Stock 2024-11-19 4 P 0 6 36.78 A 8216455 D Common Stock 2024-11-20 4 P 0 6 37.50 A 8216461 D Common Stock 2024-11-21 4 P 0 6 37 A 8216467 D Common Stock 2024-11-22 4 P 0 6 38.75 A 8216473 D Common Stock 2024-11-25 4 S 0 6 39.75 A 8216479 D Common Stock 2024-11-26 4 P 0 6 39 A 8216485 D Common Stock 2025-11-27 4 P 0 6 41 A 8216491 D Common Stock 2024-11-29 4 P 0 6 39.50 A 8216497 D Common Stock 2024-12-02 4 P 0 6 38.95 A 8216503 D Common Stock 2024-12-03 4 P 0 6 40.75 A 8216509 D Common Stock 2025-12-04 4 P 0 6 41.25 A 8216515 D Common Stock 2024-12-05 4 P 0 6 43.10 A 8216521 D Common Stock 2024-12-06 4 P 0 6 40 A 8216527 D Common Stock 2024-12-09 4 P 0 6 43.21 A 8216533 D 8,214,337 of the 8,216,533 shares reported, which were received on August 1, 2024, in connection with the merger between Horizon Kinetics LLC and Scotts Liquid Gold-Inc. (HKHC), are not available for trading. Transactions listed on behalf of the Reporting Person were also previously reported on the respective Form 4s filed by Murray Stahl and/or Peter Doyle, as applicable. /s/ Jay Kesslen, attorney-in-fact 2025-05-05