The meaning of Sigma in statistical analysis is a function of whether you use the upper or lower case of the letter. The uppercase use of sigma denotes a summation while the lowercase represents a ...

Order does not affect plans to restart production, firm says Bank of America downgraded Sigma shares, causing 15% drop Sigma still fighting former co-CEO in court over mining rights RIO DE JANEIRO, ...

Brazil’s Labor Ministry has shut down three waste piles at Sigma Lithium’s flagship mine in the state of Minas Gerais, citing a “grave and imminent” risk to workers and the local community, according ...

Sigma Lithium Corporation is downgraded to Sell due to prolonged mine closure, regulatory setbacks, and management credibility concerns. SGML faces near-term operating losses and potential capital ...

Learn the benefits and risks of options and how to start trading options Lucas Downey is the co-founder of MoneyFlows, and an Investopedia Academy instructor. Samantha (Sam) Silberstein, CFP®, CSLP®, ...

Sigma Lithium stock slumped on Thursday, and it's failing to recover. The company received a downgrade from Canaccord yesterday. After stopping operations at an asset in Brazil, Sigma Lithium is ...