Sigma Lithium Announces US$100 Million 5-Year Inaugural Convertible Bond Offering; Lowering Financing Costs, Extending Debt Maturity

HIGHLIGHTS * Sigma Lithium announces a US$ 100 Million, five-year convertible bond offering, the Company's inaugural convertible bond. * Primary use of net proceeds: Repay Senior Secured Debt with Synergy Capital. * Lowers cash interest costs enabling the Company to build operating cash flow: a fixed coupon of 7.0% p.a. replaces a floating coupon of 11.45% p.a. (SOFR, 4.5% + 6.95% p.a.) * Sets a healthy conversion premium of 25% to the reference price, without conversion during the first 12 months. * The convertible bond significantly extends repayment duration to 2031. * Greater financial flexibility for future growth plans by replacing secured borrowing with unsecured financing, with Synergy Capital's security to be released upon repayment. * Significantly reduces short-term debt by approximately 80%, from US$ 125 Million * The successful transaction is a result of the Company's consistent track record of strengthening its balance sheet, demonstrating financial discipline over the last two years: * More than US$90M in debt repaid since 2Q 24 through cash generation. * Total debt reduced by approximately 40% over two years, to US$ 125 Million on October 21, 2026. * Sigma Lithium has been self-funded since July 2023, without any equity issuance since 2021. * The transaction demonstrates strong investor support for continued execution of Sigma's management strategy and growth plans. Toronto, Ontario--(Newsfile Corp. - November 2, 2026) - Sigma Lithium Corporation (NASDAQ: SGML) (ASX: SAU) (TSXV: SGML) (BVMF: S2GM34) ("Sigma Lithium" or the "Company"), the largest producer of industrial-mineral lithium oxide concentrate in the Americas¹, is pleased to announce a US$100 million offering (the "Offering") of senior unsecured convertible bonds due 2031 (the "Bonds"), convertible at a 25% premium into CHESS Depositary Interests (the "CDIs") over common shares in the Company.