144 0002000969 XXXXXXXX LIVE 0001878848 Iris Energy Ltd 001-41072 LEVEL 12, 44 MARKET STREET SYDNEY C3 NSW 2000 212-906-1200 Gukowski Christopher Officer AU0000185993 Tourmaline Partners, LLC

680 Washington Blvd 10th floor Stamford CT 06901

166667 827501.00 232133000 12/13/2023 NASDAQ Common Stock 12/22/2022 Remuneration for board membership Iris Energy Ltd N 166667 12/22/2022 Remuneration for board membership N Christopher Guzowski

27B&C Elgin Crescent London X0 W112JD

Common Stock 11/28/2023 34853 144053.25 Christopher Guzowski is the ultimate beneficial owner of the Polpo Investments Pty Ltd. and the CAGE Family Trust 12/12/2023 12/13/2023 Christopher Guzowski