Century Aluminum (CENX) traded higher on April 1 as investors reacted to the company’s freshly filed annual report (Form 10‑K) for fiscal year 2025, removing uncertainty after a delayed filing process. The report also reiterated operational milestones around bringing back idled U.S. production, which investors have been watching as a near-term earnings lever. (sec.gov)

Beyond simply meeting a reporting requirement, the 10‑K detailed management’s expectation to begin resumption of production of an idled potline by the end of April 2026 and discussed drivers of profitability that include realized aluminum pricing and regional premiums. It also disclosed an adverse opinion on internal control over financial reporting due to a material weakness, a risk factor that can remain in focus even as the filing itself reduces uncertainty. (sec.gov)

The filing catalyst is landing into a market narrative that has been supportive for U.S.-exposed aluminum producers: U.S. physical aluminum premiums have been elevated, reflecting tariff-related and supply-driven tightness. For Century, stronger regional premiums can translate directly into better realized pricing on shipments. (tradingview.com)

Key near-term checkpoints include execution against the late-April 2026 restart timeline and whether elevated regional premiums persist into the next quarter. Investors will also monitor any follow-on disclosures related to remediation of the internal-control weakness highlighted in the annual report. (sec.gov)