Sigma Lithium Announces Full Resumption of Mining-Industrial Operations; Signed a TAC Agreement with the State of Minas Gerais; Expects to Produce 240,000t Within 12 Months

HIGHLIGHTS * The Company's industrial and mining operations returned to being fully back online following the signature of a TAC Agreement. * Sigma Lithium remains focused on ramping up mining operations and advancing its expansion plans, as per its 2Q 26 announcement: * 240,000t of lithium oxide concentrate within 12 months; and * 330,000t production in FY 27. * The Company has greenlighted the next stage of upgrades of the haulage fleet in cooperation with their manufacturer SANY. * Expects to increase fleet haulage capacity with 75t trucks and 98t excavators.

Toronto, Ontario--(Newsfile Corp. - August 21, 2026) - Sigma Lithium Corporation (NASDAQ: SGML) (TSXV: SGML) (BVMF: S2GM34) ("Sigma Lithium" or the "Company"), the largest producer of lithium oxide concentrate in the Americas¹ and dedicated to industrializing lithium materials to supply global producers of batteries for energy security in a responsible manner, announces that it has signed a Terms for Adjustment of Procedures agreement ("Termo de Ajuste de Conduta" or "TAC Agreement") with the State of Minas Gerais.