Rio Tinto Reports Passive Stake Decrease in Western Copper and Gold Corp via Schedule 13D/A

Rio Tinto plc and Rio Tinto Canada Inc. filed Amendment No. 4 to their Schedule 13D regarding Western Copper and Gold Corporation (WRN). The filing reports a beneficial ownership of 19,004,925 common shares, representing an 8.42% stake in the company. This amendment was primarily filed to reflect a passive decrease of greater than 1% in the reporting persons' percentage ownership. This change resulted from an increase in the total number of issued and outstanding shares disclosed by the issuer, rather than a sale of shares by Rio Tinto. Specifically, Western Copper and Gold Corporation reported having 225,628,684 common shares outstanding as of March 25, 2026, in its Annual Information Form. No other transactions by the reporting persons were effected during the past 60 days. The reporting persons maintain shared voting and dispositive power over the reported shares.