Better Health for All

Sigma Lithium's core business of lithium mining has an indirect and potentially negative impact on health. While lithium is used in EV batteries, contributing to cleaner air, the mining operations themselves can cause negative health externalities. Article

details complaints of respiratory problems, psychiatric disturbances, and property damage from dust, noise, and detonations. This article also highlights the disproportionate impact on vulnerable communities. However, Sigma Lithium has several social and community initiatives that aim to improve the lives of the local population. These include a microcredit program for female entrepreneurs, food basket deliveries, employment programs, and support for childcare centers , , . The company also donated disinfectant and provided COVID-19 prevention education , . Given the negative health externalities of mining and the positive impacts of the social initiatives, the company receives a score of -10. The materiality analysis indicates that scores above 3 are illogical without substantial CSR initiatives directly related to healthcare.

Fair Money & Economic Opportunity

Sigma Lithium Corporation is a mining company focused on lithium extraction and processing, not a financial institution. The company's core business does not involve offering lending, insurance, or deposit services to consumers. While Sigma Lithium engages in social initiatives, such as providing microcredit lines to female entrepreneurs and distributing food baskets, these are not part of a financial services portfolio or a 'loan/insurance book' as defined by the rubric's KPIs.

Therefore, all KPIs related to financial services, customer lending, fees, debt, and financial literacy programs are not applicable to the company's primary operations, and no relevant evidence was found to score them.

Fair Trade & Ethical Sourcing

Sigma Lithium's 2023 Forced Labour Report stated that no instances of forced or child labor were identified in 2023.

The company's contracts include clauses prohibiting child and forced labor, and it has a Code of Business Conduct and Ethics. Additionally, 75% of the company's procurement budget is directed to suppliers within Brazil, which is local to its operations.

Honest & Fair Business

Sigma Lithium Corporation adopted a Whistleblower Policy in September 2021, which allows for confidential and anonymous reports to the Audit Committee and prohibits retaliation.

However, as of Q3 2025, the company identified an ineffective internal and external communication process for this policy and is redesigning its whistleblower channel to stimulate usage. The company changed its presentation currency from Canadian dollars to United States dollars on January 1, 2025, retrospectively restating comparative financial information. Grant Thornton Auditores Independentes Ltda. performed an integrated audit of the company’s annual consolidated financial statements and the effectiveness of its Internal Control over Financial Reporting as of December 31, 2024. The Audit, Finance and Risk Committee is comprised entirely of Independent Directors. The company has a Code of Business Conduct and Ethics, adopted on September 13, 2021, which outlines a zero-tolerance approach towards bribery and corruption, prohibiting private-to-private bribery and kickbacks. The Audit Committee can mandate a third party to conduct investigations into complaints under the Whistleblower Policy.

No War, No Weapons

Sigma Lithium Corporation was added to the Morgan Stanley National Security Index on October 17, 2025,

indicating an association with the defense sector, though no direct arms revenue is reported. Multi-year field investigations by the Minas Gerais Public Prosecutor's Office from 2021 to 2025 found violations of multiple fundamental rights, including the right to peace and well-being, suggesting significant gaps in alignment with UN Guiding Principles on Business and Human Rights. The company's core product, lithium, is not typically classified as a conflict mineral.

Safe & Smart Tech

Sigma Lithium Corporation's Code of Business Conduct and Ethics, adopted in September 2021, mentions compliance with securities commission rules and regulations in its reporting jurisdictions.

Additionally, its Timely Disclosure, Confidentiality and Insider Trading Policy, also adopted in September 2021, outlines adherence to securities laws and TSX Venture Exchange rules regarding timely disclosure, confidentiality, and insider trading. No other specific, concrete data points related to Safe & Smart Tech KPIs were found in the provided articles.