Century Aluminum (CENX) is down about 5% as the market re-prices accounting and reporting risk around its Jamalco joint venture after the company disclosed it changed its accounting treatment to fully consolidate the Jamalco Production Assets, which required restating previously issued financial statements and led to a delay in filing its annual report. The same chain of events also highlighted that certain previously issued financial statements should no longer be relied upon and included disclosure around internal-control weaknesses, which can weigh on sentiment even when underlying operations are unchanged. citeturn2search5turn2search4turn2search0

Even if net income attributable to Century shareholders is not necessarily changed by the consolidation mechanics, the shift can meaningfully alter how revenue, costs, assets, liabilities, and noncontrolling interest are presented, increasing reported volatility and complicating comparisons versus prior periods. For momentum-driven names, accounting uncertainty can act as an “overhang” that triggers profit-taking on down days. citeturn2search5turn2search4

The next major catalyst is the company’s next earnings update window, which multiple market calendars peg around May 6, 2026. Any updates on remediation of internal controls, the cadence of future filings, and how Jamalco results are presented could influence both valuation and volatility. citeturn0search6turn3search6

Recent insider sales have also been in focus, including a reported CEO sale in mid-March, which can add to near-term caution even when not necessarily fundamental. With CENX up sharply over the past year, the stock can be prone to fast pullbacks when incremental uncertainty emerges. citeturn3search3turn3search0