Exclusive-Sigma Lithium's former co-CEO fired for trading in blackout period

Sigma Lithium confirms resignation of COO, citing health reasons

Exclusive-Sigma Lithium COO steps down in latest leadership shakeup

Sigma Lithium questions reporting on Brazil mineral rights 'injunction'

Brazil mineral rights dispute casts shadow on Sigma Lithium expansion

Sigma Lithium to explore alternatives after proposals for miner, Brazil unit

Sigma Lithium, eyeing buyout, sues ex-CEO and daughter-in-law over trade secrets

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