Ms. Ana Cabral reports

SIGMA LITHIUM COMMENCES TRADING ON AUSTRALIAN SECURITIES EXCHANGE, EXPANDS GLOBAL CAPITAL MARKETS PRESENCE

The Australian Securities Exchange (ASX) has approved Sigma Lithium Corp.'s listing on the ASX, broadening its access to one of the world's most established capital markets for lithium industrial-mineral producers. Achieving the ASX listing is a milestone in the company's global expansion across capital markets.

Highlights

• Sigma Lithium announces the approval of the listing by the Australian Securities Exchange (ASX) as a foreign exempt issuer.
  • The official quotation of Sigma Lithium on ASX commenced at 12 p.m. (AEST) on Sept. 3, 2026, under the ticker symbol SAU (ASX: SAU).
• The Australian listing broadens Sigma Lithium's access to one of the world's most established capital markets for lithium and battery materials.
  • The ASX has a long history as a platform for vertically integrated industrial-mineral lithium producers, global peers of Sigma Lithium.
• The company has grown a substantial investor base in the Asia Pacific region, and this strategy is expected to broaden Sigma Lithium's exposure among investors in these markets.
  • ASX has a deep and liquid pool of sophisticated investors with a strong understanding of the company's business, who are limited or restricted to only ASX-listed issuers.
• Sigma Lithium successful listing process in Australia can be attributed to:
  • The company's strong corporate governance throughout eight years as a publicly traded company;
  • A record of strict compliance with all applicable laws and regulations;
  • Management of successful delivery of operational excellence.

The ASX provides Sigma Lithium with greater access to an investor base that has a strong understanding of the mining business and a deep expertise in vertically integrated industrial lithium producers supplying the growing demand driven by electrification across Asia Pacific, a key pillar of energy security in the region.

Australian capital markets have a deep and liquid pool of sophisticated investors and market participants who are limited or restricted to only ASX-listed issuers. Australia represents a natural extension of the company's global investor strategy: Sigma Lithium runs the world's fifth-largest industrial-mineral lithium production complex, and it is the largest producer of industrial lithium oxide in the Americas. The company's global peers are listed in Australia.

Sigma Lithium was admitted to the official list of the ASX, as an ASX foreign exempt listing, on Sept. 3, 2026:

• The official quotation of Sigma Lithium chess depositary interests (CDIs) commenced at 12 p.m. (AEST) on Sept. 3, 2026, under the ticker symbol SAU (ASX: SAU).
• Each CDI represents one fully paid share of common stock (1:1 ratio) of Sigma Lithium over foreign exempt Nasdaq-quoted securities, allowing local institutional investors seamless cross-border clearing. Sigma Lithium's common shares will continue trading on both Nasdaq (dual-primary listing) and TSX-V.
• Sigma Lithium has grown a substantial investor base in the Asia Pacific region and this strategy is expected to broaden its exposure within these markets.

Sigma Lithium's co-chair and chief executive officer, Ana Cabral, said: "We are honored to join the ASX family of Australian mining companies. Australia is a natural next step in Sigma Lithium's global capital markets journey, as it is a country that is proud of its world-class mining companies. Australia is home to one of the world's most sophisticated investor communities for lithium and critical minerals and therefore provides an important platform to broaden our global shareholder base. With an existing capital markets presence in the United States, Canada and Brazil, Sigma Lithium's expansion into Australia further strengthens the company's global profile and broadens access to investors in a key global capital market that is the epicentre of producers industrializing lithium in a manner that is fully integrated with mining.

"As we continue to grow our operations, we are expanding the global investor base that can participate in that growth. This milestone reinforces the international dimension of Sigma Lithium and our long-term commitment to operational excellence, sustainability and shared prosperity in Brazil."

Sigma Lithium is focused on increasing production, enhancing operational efficiency and executing its long-term growth strategy, while maintaining its commitment to environmental sustainability and generating lasting shared prosperity in the communities surrounding its operations. This milestone is achieved as Sigma Lithium continues to advance the growth of its operations at Grota do Cirilo, in Brazil's Jequitinhonha Valley.

About Sigma Lithium Corp.

Sigma Lithium is the largest producer of lithium oxide concentrate in the Americas and dedicated to industrializing socially and environmentally sustainable lithium materials to supply global producers of batteries for energy security. The company runs one of the world's largest lithium production sites -- the fifth-largest industrial mineral complex for lithium oxide concentrate -- at its Grota do Cirilo operation in Brazil. Sigma Lithium is at the forefront of environmental and social sustainability in the electric battery materials supply chain. The company's Cleantech industrial plant combines the reuse of 100 per cent of water, zero use of toxic chemicals, zero tailings and the use of 100-per-cent renewable electricity. For more than two years Sigma Lithium has not experienced an accident with lost time.

Sigma Lithium currently has a nameplate capacity to produce 330,000 tonnes of lithium oxide concentrate on an annualized basis at its mine and state-of-the-art Cleantech industrial plant. The company has initiated a phase 2 expansion designed to close to double annual production capacity to 580,000 tonnes and plans a phase 3 expansion to increase this further to 830,000 tonnes.

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