** U.S.-listed shares of Canadian miner Sigma Lithium SGML.O SGML.V down 5.3% at $14.83 premarket
** BofA Global Research cuts rating to "underperform" from "neutral" citing unresolved operational and liquidity issues
** Says no clarity on resumption of mining or receipt of cash from prepayments
** "Even assuming a mid-January restart... it would likely take a several months to reach meaningful volumes, limiting material sales in 1Q26" - Brokerage
** Adds that bigger concern is SGML still has to pay regular bills without an operating mine
** In 2025, stock was up 17.5%
(Reporting by Pranav Mathur in Bengaluru)
((Pranav.Mathur@thomsonreuters.com;))