Century Aluminum (CENX) Q3 2026 earnings review
Century Aluminum shipments rebound, but its fourth-quarter profit plan drops
Century Aluminum got its smelters back to near full output, but peaking metal prices mean its quarterly profit is already heading lower. Revenue at the primary aluminum producer jumped 28% from last quarter as the repaired line in Iceland doubled its shipments. That volume turned insurance-backed accounting adjustments into physical sales and lifted cash to $274 million above total debt by our math, yet hot summer weather inflated power costs and kept operating cash profit near flat.
| Revenue | $961.2M +28% from last quarter |
|---|---|
| Operating cash profit (Adjusted EBITDA) | $331.6M inside the $325–345M plan |
| Net cash (cash minus total debt) | $274.3M $98M net debt last quarter |
| Fourth-quarter Adjusted EBITDA outlook | $275–300M middle of the range: -13% from Q3 |
⚖️ Verdict: 🔴 Bearish
The story got worse because the fourth-quarter outlook points to a 13% drop in operating cash profit at the middle of the range, by our math, just as the company hits full production. In previous quarters, rising aluminum prices drove profit higher while plants were under repair; now all plants are running, but lower global metal prices are pulling earnings down. The good news is that third-quarter free cash flow reached $357 million by our math, giving the company a large cash cushion.
The question now is whether the growing cash pile will go to shareholders or be consumed by the planned Oklahoma smelter. One view is that net cash and proposed US tariff credits will cover the build and allow share buybacks; the other is that an undisclosed multi-billion-dollar construction bill is the reason management keeps delaying returns. The final investment decision and project budget, due by the end of 2026, will settle it.
🐂 Bull Case
Iceland Restart Turns Paper Profit Into Real Metal
Century Aluminum, which operates primary aluminum smelters in the United States and Iceland, spent the first half of 2026 repairing a broken production line at Grundartangi in Iceland. While that line sat idle, management added the lost profit back into Adjusted EBITDA, a cash profit measure excluding one-offs. In the third quarter, the "restart of Line 2 at the Grundartangi, Iceland facility returning to near full production during the quarter" turned those accounting adjustments into physical metal.
- Iceland shipments: 75,300 tonnes, up 112% from last quarter and above the 71,739 tonnes shipped a year ago
- Adjusted EBITDA excluding the Iceland outage add-back: $312.7 million, up 25% from $250.3 million last quarter by our math
- Cost of goods sold (cost of making the metal): 68.5% of sales, down 1.2 percentage points from last quarter
- Selling and administrative overhead: 1.1% of sales, down 1.0 percentage point from last quarter
This matters because the quality of earnings improved even though headline Adjusted EBITDA rose only 1.4% from last quarter to $331.6 million. The outage adjustment dropped from $76.6 million in the second quarter to $18.9 million in the third, so reported operating profit climbed 38% to $292.3 million and operating margin expanded by 2.3 percentage points to 30.4%.
What to watch: the Iceland outage adjustment in the fourth-quarter reconciliation table. Once replacement transformers go in during the fourth quarter, that add-back should drop to zero.
Cash Now Exceeds Debt by $274 Million
The aluminum producer finished its major repair and restart spending just as metal shipments recovered, which caused cash to build rapidly on the balance sheet. By our math, subtracting six-month figures from the nine-month cash flow statement shows the company generated $394.9 million in operating cash flow during the third quarter, while capital spending fell to $37.8 million from $59.6 million in the second quarter.
That left $357.1 million of free cash flow in a single quarter, or 37% of sales by our math. Total cash and restricted cash reached $754.6 million at the end of September against $480.3 million of long-term debt, putting the US group in a net cash position of $274.3 million by our math, compared with $98 million of net debt three months earlier. Total liquidity, which includes credit lines, rose to $1,161.5 million.
What to watch: fourth-quarter capital spending against the $12.8 million remainder implied by the prior $180–190 million full-year budget. Holding spending near that level keeps cash building ahead of the Oklahoma smelter decision.
🐻 Bear Case
Fourth-Quarter Plan Points to a 13% Profit Drop
Management's case has rested on bringing every plant back to full capacity to capture high aluminum prices. All plants ran near full capacity by late July, yet the profit trajectory has turned down. "The Company expects fourth quarter Adjusted EBITDA to range between $275 to $300 million," Century Aluminum said in the release.
At the $287.5 million middle of that range, operating cash profit will fall 13.3% from the third quarter's $331.6 million by our math. Because aluminum prices pass into the company's contracts with a one-to-two-month lag, the lower fourth-quarter plan shows that the pullback in global aluminum prices from their spring peak is now outweighing the volume gains from the restarted smelter lines.
What to watch: the fourth-quarter Adjusted EBITDA bridge on the earnings call, specifically the price and premium drag versus cost changes. A price drag larger than $35 million would confirm that metal prices, not temporary seasonal costs, are driving earnings lower.
Summer Heat Cut Profit and US Volume Lags
Century Aluminum operates US smelters in South Carolina and Kentucky that buy market-priced electricity and have faced recurring operational hiccups. In the third quarter, the company said results were hurt by "unfavorable power price realization due to extreme hot weather in the third quarter" alongside $1.1 million of emergency energy charges at its Mt. Holly plant.
US shipments also fell short of a full-capacity step-up. Even though the company finished restarting the final 90 pots at Mt. Holly in late June — a project meant to add over 50,000 tonnes a year, or 12,500 tonnes a quarter — total US shipments rose by only 3,126 tonnes, or 3.3%, from the second quarter to 98,183 tonnes. By our math, meeting the company's prior 630,000-tonne full-year target would require 203,020 tonnes in the fourth quarter, 17% above the third quarter's run rate.
What to watch: US shipments in the fourth quarter. A reading still stuck below 102,000 tonnes would show that post-restart instability at Mt. Holly did not fully clear in the third quarter.
Risks this quarter didn't answer
Four standing concerns around future spending, trade rules and capital returns received no new numbers in the third-quarter earnings release.
- Oklahoma smelter cost and power contract: the release mentions the joint venture with Emirates Global Aluminium only in cautionary boilerplate; the final investment decision due by year-end will show the price tag.
- Tariff-reduction import allowance: no update on Commerce Department rules for importing 300,000 tonnes at a 25% tariff rate starting in 2027; the quarterly call or annual filing will test whether approval is on track.
- Shareholder buybacks: treasury stock stayed flat at $86.3 million despite $274.3 million of net cash; management previously tied any return plan to the Oklahoma project decision.
- Jamalco refinery bauxite quality: no standalone alumina cost figures in the release; the quarterly filing's segment footnotes will show whether the new power turbine offset ore quality costs.
💲 Other KPIs
Sales to related parties — primarily 30% shareholder Glencore, which buys metal from the smelters — jumped 48.6% from last quarter to $491.6 million. By our math, related parties accounted for 51.1% of total revenue, up from 44.0% in the second quarter and 47.1% in the first quarter as Iceland shipments returned.
Inventories rose 5.1% from last quarter to $612.6 million, and are up 17.9% since December as the smelters restocked raw materials and finished metal for higher production. At the same time, net trade receivables — bills customers have not yet paid — fell 24.7% from last quarter to $102.6 million, releasing cash.
Weighted-average diluted shares rose 0.4% from last quarter and 6.0% from a year ago, when the count stood at 99.2 million. Basic shares held steady at 99.0 million for a third straight quarter, as the company did not repurchase any common stock during the first nine months of 2026.
🔮 Guidance
New. The plan calls for operating cash profit to drop to $287.5 million at the middle of the range, down 13.3% from the third quarter's $331.6 million by our math. That remains 68.5% above last year's fourth quarter, when the Iceland outage began. Over the last four quarters, actual results have averaged right on the middle of the company's initial range.
❓ Key Questions
What drives the $44 million fourth-quarter profit drop?
The fourth-quarter Adjusted EBITDA plan drops by $44 million at the middle of the range despite full production in Iceland and reduced summer heat. Management needs to split that decline between lower lagged aluminum prices, tariff premiums and plant costs.
Why did US shipments rise only 3% after the restart?
Finishing the Mt. Holly expansion in late June should have added roughly 12,500 tonnes a quarter, yet US shipments grew by just 3,126 tonnes in the third quarter. Investors need to know how many tonnes post-restart instability cost.
What is the price tag for the Oklahoma smelter?
Management targeted a final investment decision and groundbreaking by the end of 2026 for the 750,000-tonne Oklahoma smelter with Emirates Global Aluminium. The company still has not disclosed total construction costs, the power contract terms or its 40% funding share.
How much insurance cash remains to be collected for Iceland?
Century Aluminum has added back $155.5 million of pre-tax Iceland outage losses to Adjusted EBITDA over the past two quarters alone, while booking $13.6 million of property insurance cash in investing cash flows year-to-date. The remaining receivable timeline is unclear.