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Sigma Lithium Corporation files foreign issuer current reports that document operating and commercial updates for its lithium concentrate business. Its Form 6-K disclosures include earnings materials, production guidance, sales of high-grade lithium oxide concentrate and high-purity lithium fines, offtake agreements, and working-capital financing supported by bank guarantees or customer-backed arrangements.
The filing record also describes the Grota do Cirilo operation, the Greentech Industrial Plant, capacity-expansion disclosures, and sustainability-related operating practices such as dry stacking, water reuse, avoiding toxic chemicals, and renewable power. These disclosures connect reported financial results, commercial contracts, capital resources, and mine operations to the company's Brazilian lithium production platform.
Sigma Lithium Corporation reported the voting results of its June 30, 2026 virtual annual and special meeting of shareholders. A total of 81,553,499 common shares, representing 72.77% of outstanding shares, were voted in person or by proxy.
Shareholders approved fixing the board at five directors, with 81,498,307 votes for and 55,191 against. All five nominees — Ana Cristina Cabral, Marcelo Paiva, Junaid Jafar, Alexandre Rodrigues Cabral, and Kátia Abreu — were elected, with support ranging from 83.97% to 99.97% of votes cast. Grant Thornton Auditores Independentes Ltda. was appointed as auditor for the ensuing year, receiving 81,511,689 votes for and 41,810 votes withheld, or 99.95% support.
Sigma Lithium Corporation reported the results of its 2026 Annual Meeting of Shareholders, where 81,553,499 common shares, representing 72.77% of outstanding shares, were voted in person or by proxy. Shareholders elected or re-elected five directors, with total votes of 96.25% in favor and 3.75% against across the slate, and supported each individual nominee with large majorities, including over 97% support for CEO Ana Cristina Cabral.
Shareholders also voted 99.93% in favor of fixing the Board at five directors and approved the appointment of Grant Thornton LLP as auditor for the ensuing year with 99.95% of votes cast in favor. The outcome is described as providing a strong mandate as Sigma Lithium advances an expansion expected to increase annual production capacity from its current 270,000 tonnes of lithium oxide concentrate (about 38,000–40,000 tonnes of LCE) toward 520,000 tonnes under Phase 2, with a planned Phase 3 to 770,000 tonnes at its Grota do Cirilo operation in Brazil.
Sigma Lithium Corporation reported that it produced 35,000 tonnes of high-grade lithium concentrate in the second quarter of 2026, exceeding its prior guidance of 33,000 tonnes by 6%.
The company attributes this performance to a comprehensive upgrade and “primarization” of its mining operations, which improved efficiency and reliability. Its Cleantech Industrial Plant achieved 70% lithium recovery from spodumene ore and an approximate 20% yield. Sigma Lithium remains on track for annualized Phase 1 production of 240,000 tonnes and is planning Phase 2 and Phase 3 expansions toward 520,000 and 770,000 tonnes per year, respectively.
A cost and cash flow scenario table shows all-in sustaining costs as low as US$610 per tonne for all three phases combined, and illustrative annual cash flows ranging from US$130 million to US$1.135 billion at realized prices between US$1,500 and US$2,500 per tonne.
Sigma Lithium reports that a Court of Appeal judge in Minas Gerais has overturned a prior lower-court decision that had included the potential for a US$10 million legal collateral. The judge instead requested that the company fund an independent technical advisory firm to monitor operational impacts on nearby municipalities.
The ruling relied on 12 months of environmental monitoring data collected and verified by external experts, showing low levels of dust, vibrations, and noise in four neighboring communities. Sigma Lithium highlights that it operates 560% better than recommended standards for total suspended particles and 350% better for fine particles, with 95 noise measurement campaigns demonstrating compliance with Brazilian standards.
The company also reiterates its broader operating profile, including a nameplate capacity of 270,000 tonnes of lithium oxide concentrate per year (approximately 38,000–40,000 tonnes of LCE) at its Grota do Cirilo operation in Brazil and a Phase 2 expansion aiming to increase capacity to 520,000 tonnes.
Sigma Lithium Corporation is calling a virtual-only annual shareholder meeting for June 30, 2026, at 11:00 a.m. Toronto time, accessible via live audio webcast. Shareholders of record on May 26, 2026 may vote online or by proxy on routine matters.
The agenda includes fixing the Board at five directors, electing the listed nominees, and appointing Grant Thornton Auditores Independentes Ltda. as auditors. The circular outlines detailed proxy procedures, governance practices, and an equity incentive plan covering up to 18,120,878 common shares out of 112,064,646 shares outstanding.
Sigma Lithium Corporation filed a legal appeal against a decision by a local court in Aracuai, Brazil, that includes the potential for a US$10 million legal collateral if charges ultimately result in a final negative ruling after all appeals. The Company states that no payments are currently due and that similar cases often take years to conclude. Sigma Lithium says the ruling is unwarranted, notes that authorities recently visited its operations and, according to the Company, verified conformity with Brazilian environmental rules. It also reports strong community backing, citing thousands of supportive attendees at prior public hearings. The Company links a negative online “fake news” campaign and a 15% share price drop to the period immediately after it reported record earnings for 1Q26.
Sigma Lithium Corp ownership disclosure: Van Eck Associates Corporation reports beneficial ownership of 5,705,514 common shares of Sigma Lithium Corp as of 03/31/2026. The filing states this represents 5.12% of the class and that Van Eck has sole voting and dispositive power over these shares.
Sigma Lithium Corporation reports strong operational and safety performance while responding to recent media coverage. The company has achieved 1,010 days without accidents and continues to report zero fatalities since operations began 14 years ago. Mining is fully ramped and on track to meet guidance of 240,000 tonnes per year of lithium oxide concentrate, supported by large-scale truck and excavator fleets and more than 1,000 direct jobs.
The company highlights its cleantech “Greentech Industrial Plant,” which uses dense media separation without drinking water or toxic chemicals, runs on 100% renewable power and uses dry stacked tailings that can be reprocessed or sold. Sigma Lithium expects to reach full circularity next quarter, aiming to be among the first zero mining waste battery material sites. It also notes a small R$10,000 (about US$2,000) fine from Brazil’s Ministry of Labor and Employment tied to an administrative enquiry regarding certain waste piles, which it states does not materially affect operations, and references a prior technical note from Brazil’s mining regulator attesting to the safety of its waste rock piles. The company characterizes recent negative media reports as inaccurate and points out they coincided with a surge in put option volumes and a 6.5% share price drop.