Sigma Lithium Produced 35,000t Lithium Concentrate in 2Q26, Beat Guidance, Delivering Successful Mining Operations Upgrade

Produced of 35,000t of lithium oxide concentrate in 2Q26, exceeding previous guidance of 33,000t

Demonstrates successful execution of the Company's mining operations upgrade

Cleantech industrial operations continue to exceed expectations, achieving 70% recovery of lithium from spodumene ore, delivering approximately 20% yield

On track to deliver annualized production of 240,000t for Phase 1

Sigma Lithium Corporation (NASDAQ: SGML) (TSXV: SGML) (BVMF: S2GM34) ("Sigma Lithium" or the "Company"), the largest producer of lithium oxide concentrate in the Americas¹ and dedicated to industrializing sustainable and traceable lithium materials to supply global producers of batteries for energy security, announces that it exceeded by 6% its production guidance for the second quarter of 2026, delivering 35,000 tonnes of high grade lithium concentrate, compared with the previous guidance of 33,000 tonnes.

The production performance was a result of the successful execution by Sigma Lithium of a comprehensive mining upgrade, following a primarization of its mining operations.

The Company's Cleantech Industrial Plant continued to exceed expectations, achieving 70% recovery of lithium from spodumene ore and delivering an approximate 20% yield.

During the quarter, the Company reached full operating run-rate from its expanded mining fleet, supported by an optimized mine plan and enhanced operational execution.

The upgrade to the mining operations improves operating efficiency and strengthens production reliability, providing greater operational flexibility.

As a result of the primarization, Sigma Lithium's own mining operations team demonstrated its readiness to deliver the raw materials to support the Company's industrial growth plans to build a second Cleantech Industrial Plant within 12 months and potentially a third Cleantech Industrial Plant, as indicated in Table 1 below.