X0609 4 2026-08-28 true 0001543418 Trilogy Metals Inc. TMQ TMQ (TSX) 0001635752 South32 Ltd true LEVEL 2 100 ST GEORGES TERRACE PERTH AUSTRALIA C3 WA 6000 AUSTRALIA false false true false 0001726854 South32 International Investment Holdings Proprietary Ltd true LEVEL 2 100 ST GEORGES TERRACE PERTH AUSTRALIA C3 WA 6000 AUSTRALIA false false true false false Common Stock 2026-08-28 4 S false 8215570 2.17 D 10379741 I By wholly-owned subsidiary The shares are owned directly by South32 International Investment Holdings Proprietary Limited, which is a wholly-owned subsidiary of South32 Limited. South32 Limited is an indirect beneficial owner of the reported securities. Pursuant to the terms of a Transaction Agreement dated August 28, 2026, by and between South32 International Investment Holdings Pty Ltd ("South32 International") and the United States Department of Defense, South32 International agreed to sell 8,215,570 common shares of the Issuer to the Investor for $17,827,785.90 in a private transaction. /s/ Claire Tolcon, Company Secretary of South32 Limited 2026-08-31 /s/ Rebecca Healy, Company Secretary of South32 International Investment Holdings Proprietary Limited 2026-08-31