Century Aluminum Company (CENX)
CENX moved a median of +0.33% 30 minutes after news, and -0.07% by the close. How CENX actually reacts to news — the realized, point-in-time move the market made, measured across 240 labeled events over the last three years with zero look-ahead.
CENX’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.20% | 60% | 237 |
| 30-min | +0.33% | 56% | 239 |
| 60-min | +0.56% | 59% | 239 |
| to close | -0.07% | 49% | 240 |
| Middle 50% of CENX reactions | -1.13% to +1.55% |
|---|---|
| Median reaction (30-min) | +0.33% |
| Measured reactions | 240 |
Half of all Century Aluminum Company news events land between -1.13% and +1.55% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How CENX reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 30 | +0.22% | 57% | +1.05% |
| Analyst downgrades | 16 | +1.39% | 88% | +1.07% |
| Rating reiterations | 27 | +0.09% | 56% | -0.08% |
| Price-target raises | 12 | +0.74% | 67% | -0.31% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 2 further classes were observed with fewer than 10 measured events and are not published. See how CENX ranks against every other measured name →
That’s how CENX usually reacts — get an email when it moves on news →Email me when CENX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CENX's baseline. Nothing else.
Recent CENX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form SD CENTURY ALUMINUM CO | SEC filing · Form SD | SEC EDGAR | -0.45% | -0.08% | |
| Century Aluminum Company Reports Second Quarter 2026 Results | Press release | GlobeNewswire | +7.40% | +7.06% | |
| Form 10-Q CENTURY ALUMINUM CO For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +7.40% | +7.06% | |
| Form 8-K CENTURY ALUMINUM CO For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | +7.40% | +7.06% | |
| Century Aluminum Sets Date for Second Quarter 2026 Earnings Announcement | Press release | GlobeNewswire | +0.04% | -1.90% | |
| Commerce Secretary Howard Lutnick visits Century Aluminum Mt. Holly, Celebrate Expansion with South Carolina Leaders | Press release | GlobeNewswire | +0.04% | -1.90% | |
| UPDATE — Commerce Secretary Lutnick, Senior Counselor to President Trump Dr. Navarro, South Carolina Attorney General Wilson to Celebrate Historic 10% Increase in U.S. Aluminum Production | Press release | GlobeNewswire | -0.42% | -1.69% | |
| Commerce Secretary Lutnick, U.S. Senator Tim Scott and Governor Henry McMaster to Celebrate Historic 10% Increase in U.S. Aluminum Production | Press release | GlobeNewswire | +1.44% | +1.55% | |
| Century Aluminum Applauds President Trump’s Action to Spur Domestic Aluminum Production | Press release | GlobeNewswire | -0.79% | -0.13% | |
| Form 8-K CENTURY ALUMINUM CO For: Jun 15 | SEC filing · Form 8-K | SEC EDGAR | -0.75% | -5.29% | |
| Century Aluminum to Participate in Wells Fargo Industrials and Materials Conference 2026 | Press release | GlobeNewswire | -0.32% | +0.86% | |
| Century Aluminum Company Reports First Quarter 2026 Results | Press release | GlobeNewswire | -2.05% | -4.97% | |
| Form 10-Q CENTURY ALUMINUM CO For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -2.05% | -4.97% | |
| Form 8-K CENTURY ALUMINUM CO For: May 07 | SEC filing · Form 8-K | SEC EDGAR | -2.05% | -4.97% | |
| Century Aluminum Sets Date for First Quarter 2026 Earnings Announcement | Press release | GlobeNewswire | -0.76% | -1.76% | |
| Form DEF 14A CENTURY ALUMINUM CO For: Jun 15 | SEC filing · Form DEF | SEC EDGAR | -1.34% | +1.45% | |
| Form DEFA14A CENTURY ALUMINUM CO | SEC filing · Form DEFA14A | SEC EDGAR | -1.34% | +1.45% | |
| Century Aluminum resumes production at Grundartangi ahead of schedule | Press release | GlobeNewswire | -1.34% | +1.45% | |
| Century Aluminum Commences Expanded Production at Mt. Holly Smelter | Press release | GlobeNewswire | +0.06% | +4.24% | |
| Century Aluminum Applauds President Trump for Executive Order to Fully Enforce Sec. 232 Aluminum Tariffs | Press release | GlobeNewswire | +0.06% | +0.08% | |
| Century Aluminum Promotes Levi Chaffin to Senior Vice President of Operations, Americas | Press release | GlobeNewswire | +2.60% | +8.04% | |
| Form 10-K CENTURY ALUMINUM CO For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.46% | -2.85% | |
| Form 8-K CENTURY ALUMINUM CO For: Mar 02 | SEC filing · Form 8-K | SEC EDGAR | -0.46% | -2.85% | |
| Form IRANNOTICE CENTURY ALUMINUM CO | SEC filing · Form IRANNOTICE | SEC EDGAR | -0.46% | -2.85% | |
| Form NT 10-K CENTURY ALUMINUM CO For: Mar 03 | SEC filing · Form NT | SEC EDGAR | -0.46% | -2.85% | |
| Oklahoma’s Burgeoning Aluminum Hub Gets Boost with Agreement Between U.S. Aluminum Company and EGA, Century Aluminum | Press release | GlobeNewswire | -1.60% | +3.24% | |
| Century Aluminum to Participate in BMO 2026 Global Metals, Mining & Critical Minerals Conference | Press release | GlobeNewswire | -0.15% | -1.37% | |
| Century Aluminum Company Statement on U.S. Supreme Court IEEPA Ruling | Press release | GlobeNewswire | -0.27% | -0.11% | |
| Century Aluminum Company Reports Fourth Quarter 2025 Results | Press release | GlobeNewswire | +0.52% | +0.27% | |
| Form 8-K CENTURY ALUMINUM CO For: Feb 19 | SEC filing · Form 8-K | SEC EDGAR | +0.52% | +0.27% | |
| EGA and Century Celebrate Historic Smelter Project, Meet With U.S. Energy Secretary Chris Wright | Press release | GlobeNewswire | -0.35% | -1.30% | |
| Bechtel to lead preparatory engineering work on Oklahoma aluminum project | Press release | GlobeNewswire | +0.53% | +0.42% | |
| Century Aluminum Sets Date for Fourth Quarter 2025 Earnings Announcement | Press release | GlobeNewswire | +0.32% | -1.72% | |
| Form 8-K CENTURY ALUMINUM CO For: Feb 02 | SEC filing · Form 8-K | SEC EDGAR | -0.44% | -0.77% | |
| New Digital Infrastructure Campus to Be Built at Hawesville | Press release | GlobeNewswire | -0.44% | -0.77% | |
| Strategic Mineral Stocks Gain Ground as Pentagon Pushes for Secure Defense Supply Chains | Press release | PR Newswire | +0.20% | -1.85% | |
| Century Aluminum Joins EGA Project to Build First U.S. Smelter in Almost 50 Years | Press release | GlobeNewswire | -1.82% | -7.54% | |
| Form 8-K/A CENTURY ALUMINUM CO For: Nov 06 | SEC filing · Form 8-K | SEC EDGAR | -0.48% | +2.24% | |
| Century Aluminum Company Reports Third Quarter 2025 Results | Press release | GlobeNewswire | +8.39% | +18.04% | |
| Form 10-Q CENTURY ALUMINUM CO For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +8.39% | +18.04% | |
| Form 8-K CENTURY ALUMINUM CO For: Nov 06 | SEC filing · Form 8-K | SEC EDGAR | +8.39% | +18.04% | |
| Jamalco Begins Restart Procedures Following Hurricane Melissa | Press release | GlobeNewswire | +2.07% | +2.03% | |
| Century Aluminum Sets Date for Third Quarter 2025 Earnings Announcement | Press release | GlobeNewswire | +2.27% | -0.03% | |
| Form 8-K CENTURY ALUMINUM CO For: Oct 21 | SEC filing · Form 8-K | SEC EDGAR | -0.24% | -4.74% | |
| Century Aluminum Reports Electrical Equipment Failure Affecting One Potline at Grundartangi, Iceland Smelter | Press release | GlobeNewswire | -0.24% | -4.74% | |
| Century Aluminum Signs Power Agreement Extension with Santee Cooper Through 2031 | Press release | GlobeNewswire | +1.82% | -4.65% | |
| Form SD CENTURY ALUMINUM CO | SEC filing · Form SD | SEC EDGAR | +1.08% | +7.90% | |
| Century Aluminum Company Reports Second Quarter 2025 Results | Press release | GlobeNewswire | +7.09% | +1.01% | |
| Citing Benefits of 232 Tariffs, Century Aluminum Announces Restart to Bring Mt. Holly SC Plant to Full Production, Increasing U.S. Aluminum Production by 10% | Press release | GlobeNewswire | +7.09% | +1.01% | |
| Form 10-Q CENTURY ALUMINUM CO For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +7.09% | +1.01% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CENX section they belong to.
Where else CENX is measured.
CENX earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| LSB Industries, Inc. (LXU) | 241 | -0.11% | 47% |
| MDU Resources Group, Inc. (Holding Company) (MDU) | 241 | +0.17% | 57% |
| Clearwater Paper Corporation (CLW) | 239 | -0.04% | 47% |
| Boise Cascade, L.L.C. (BCC) | 238 | -0.27% | 41% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Basic Materials names, measured the same way →
Every ticker we measure the same way24
Apple (AAPL)
How AAPL actually reacts to news, measured.
NVIDIA (NVDA)
How NVDA actually reacts to news, measured.
Tesla (TSLA)
How TSLA actually reacts to news, measured.
Microsoft (MSFT)
How MSFT actually reacts to news, measured.
Advanced Micro Devices (AMD)
How AMD actually reacts to news, measured.
Amazon (AMZN)
How AMZN actually reacts to news, measured.
Alphabet (GOOG)
How GOOG actually reacts to news, measured.
Meta Platforms (META)
How META actually reacts to news, measured.
Broadcom (AVGO)
How AVGO actually reacts to news, measured.
JPMorgan Chase (JPM)
How JPM actually reacts to news, measured.
Visa (V)
How V actually reacts to news, measured.
Walmart (WMT)
How WMT actually reacts to news, measured.
Eli Lilly (LLY)
How LLY actually reacts to news, measured.
UnitedHealth Group (UNH)
How UNH actually reacts to news, measured.
Netflix (NFLX)
How NFLX actually reacts to news, measured.
Johnson & Johnson (JNJ)
How JNJ actually reacts to news, measured.
Exxon Mobil (XOM)
How XOM actually reacts to news, measured.
Home Depot (HD)
How HD actually reacts to news, measured.
Costco (COST)
How COST actually reacts to news, measured.
Mastercard (MA)
How MA actually reacts to news, measured.
Oracle (ORCL)
How ORCL actually reacts to news, measured.
Salesforce (CRM)
How CRM actually reacts to news, measured.
Bank of America (BAC)
How BAC actually reacts to news, measured.
Coca-Cola (KO)
How KO actually reacts to news, measured.
Walt Disney (DIS)
How DIS actually reacts to news, measured.
Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is Century Aluminum Company's median reaction calculated?
Every labeled CENX news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 240 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 56% of CENX's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does CENX's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.