LONDON: Rio Tinto and Arcadium Lithium plc (NYSE: ALTM) announced a definitive agreement under which Rio Tinto will acquire Arcadium in an all-cash transaction for US$5.85 per share. The transaction represents a premium of 90% to Arcadium’s closing price of $3.08 per share on 4 October 2024, a premium of 39% to Arcadium’s volume-weighted average…