Key highlights

• Sigma Lithium lodged announcements with the ASX on 3 November, including US$100 million of convertible bonds to refinance secured debt.

• A preview of third-quarter results and a later notice that the company priced an upsized offering were also released that day.

• This update covers the maturities, production after the restart, costs and margins, and licensing developments.

Sigma Lithium (ASX:SAU) lodged three price-sensitive announcements with the ASX on 3 November: one describing US$100 million of convertible bonds to refinance secured debt, a preview of third-quarter results, and a later notice that it had priced an upsized offering, with the headline referring to 125 million. Sigma's shares trade on the ASX as CHESS Depositary Interests under the code SAU, alongside its North American listings.

The company says the restructuring extends more than 90% of its Debt maturities and cuts Short-Term Debt by about 78%. Short-term debt falls to US$28 million from US$125 million, with total debt of US$125 million as at 21 October, down about 40% over two years.

Why maturities matter

For a producer that has just been through an operational suspension, the timing of debt repayments can matter as much as the total. Pushing maturities out gives management more room to rebuild production and Cash Flow before large repayments fall due. Convertible bonds, however, can dilute existing holders if they convert into shares, so the final terms are important. Investors should also be aware that convertible bonds usually rank ahead of shareholders.

Production after the restart

Sigma said operations resumed smoothly early in the fourth quarter after a suspension in the third quarter. Third-quarter production and sales totalled 7,293 tonnes of high-grade lithium oxide concentrate. The shutdown left about 21,000 tonnes of intermediate and low-grade products unprocessed.

In the fourth quarter to date, Sigma said it had processed and sold 10,000 tonnes of that inventory and produced 9,000 tonnes of high-grade concentrate. It maintained guidance of 240,000 tonnes over the next 12 months and 330,000 tonnes on an annualised basis in fiscal 2027. These are targets, not achieved results, and depend on the restart holding.

Costs and margins

The company reported a 32% gross Margin in its quarterly preview. Its cost, insurance and freight (CIF) cash cost to China was US$518 per tonne, compared with US$543 per tonne a year earlier. Sigma lowered its 2026 All-In Sustaining Cost guidance by 6% to US$668 per tonne and kept its fiscal 2027 guidance at US$620 per tonne.

Low costs matter because lithium prices have been volatile. On the same day, Citi had cut its lithium price forecasts, which illustrates the pricing backdrop Sigma faces. That report concerns the market generally and does not establish any effect on Sigma's results.

Legal and licensing developments

Sigma reported favourable rulings in Brazilian courts, including a decision by the Superior State Court of Appeals, and said it had signed a Term of Adjustment of Conduct agreement with the state of Minas Gerais that it believes protects its environmental licences. These are the company's characterisations, and legal matters can continue to evolve.

Funding history

Sigma said it has repaid more than US$90 million of debt since the second quarter of 2024 and has been self-funded since starting commercial sales in July 2023, with no Equity issuance since 2021 and no debt issuance since 2022 before this transaction.

What to watch

Key items are the final bond terms, including conversion price and coupon, the full third-quarter results, and whether production stays on track after the restart.

Why the ASX listing matters

Sigma's ASX Quotation is relatively recent, with ASX records showing the CDIs listed on 4 September 2026. The Hong Kong Convertible Bond is linked to those ASX-listed CDIs, which ties the Australian line more closely to the company's funding. Australian investors can therefore be directly affected by any conversion, and should read the bond documents carefully.