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Related Party Transactions
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related Party Transactions
2.    Related Party Transactions
The significant related party transactions occurring during the three and nine months ended September 30, 2025 and 2024 are described below. All of our related party transactions are subject to the Company's Related Party Transaction Policy and are required to be made on an arm's length basis and on terms that are fair and reasonable to the Company and substantially the same as would apply if the other party was not a related party. We believe all of our transactions with related parties are at prices that approximate market.
Glencore Ownership
As of September 30, 2025, Glencore plc and its affiliates (together "Glencore") beneficially owned 42.9% of Century’s outstanding common stock (45.8% on a fully-diluted basis assuming the conversion of all of the Series A Convertible Preferred Stock) and all of our outstanding Series A Convertible Preferred Stock. See Note 13. Shareholders' Equity for a description of our outstanding Series A Convertible Preferred Stock. Century and Glencore enter into various transactions from time to time, such as the purchase and sale of primary aluminum, alumina and other raw materials; tolling agreements; forward financial contracts and borrowing and other debt transactions.
Sales to Glencore
For the three months ended September 30, 2025 and 2024, we derived approximately 50.6% and 61.6%, respectively, of our consolidated net sales from Glencore. For the nine months ended September 30, 2025 and 2024, we derived approximately 56.3% and 61.0%, respectively, of our consolidated net sales from Glencore.
Glencore purchases aluminum produced at our U.S. smelters at prices based on the London Metal Exchange ("LME") plus the Midwest regional delivery premium plus any additional market-based product premiums. Glencore purchases aluminum produced at our Grundartangi, Iceland smelter at prices based on the LME plus the European Duty Paid premium plus any additional market-based product premiums.
We have entered into agreements with Glencore pursuant to which we sell certain amounts of alumina at market-based prices. For the three and nine months ended September 30, 2025, the Company recognized $34.8 million and $161.2 million, respectively, of revenue related to alumina sales to Glencore. For the three and nine months ended September 30, 2024, the Company recognized $31.5 million and $117.3 million, respectively, of revenue related to alumina sales to Glencore.
Purchases from Glencore
We purchase a portion of our alumina and certain other raw material requirements from Glencore. Alumina purchases from Glencore during the three and nine months ended September 30, 2025 and 2024 were priced based on published alumina and aluminum indices as well as fixed prices.
Financial Contracts with Glencore
From time to time, we enter into certain financial contracts with Glencore. See Note 10. Derivatives regarding these forward financial sales contracts.
Summary
A summary of the aforementioned significant related party sales and purchases is as follows: 
 Three months ended
September 30,		Nine months ended
September 30,
 2025202420252024
Net sales to Glencore$319.6 $332.1 $1,065.9 $971.3 
Purchases from Glencore(1)
90.7 63.9 230.8 179.1 
(1)Includes settlements of financial contract positions.
Vlissingen Credit Facility
On December 9, 2022, Vlissingen entered into a Facility Agreement with Glencore International AG, which was amended and extended on October 1, 2024 (as amended, the “Vlissingen Credit Facility”). The availability period for borrowings under the Vlissingen Credit Facility was extended by two years and now ends on December 2, 2026. Under the Vlissingen Credit Facility, Vlissingen may borrow from time to time up to $90.0 million in one or more loans at either (i) a fixed interest rate equal to 8.75% per annum (the “Fixed Rate”), or (ii) a variable interest rate equal to the 1-month SOFR rate plus 3.687 percentage points, subject to an absolute maximum level of 9.00% and an absolute minimum level of 7.00% (the “Variable Rate”). The Fixed Rate is only applicable to borrowings made on or before December 1, 2024, after which the Variable Rate shall apply to all borrowings under the Vlissingen Credit Facility. See Note 11. Debt for additional information. Borrowings under the Vlissingen Credit Facility are expected to be used for general corporate and working capital purposes of Century and its subsidiaries.
Carbon Credit Repurchase Agreement
In September 2023, our wholly owned subsidiary Nordural Grundartangi ehf ("Grundartangi"), entered into a structured repurchase arrangement with Glencore and sold 390,000 European Union Allowances ("Carbon Credits") at a price of €82.18 per Carbon Credit, for an aggregate amount of €32.1 million (the "Original Carbon Credit Agreement"). Pursuant to the terms of the Original Carbon Credit Agreement, Grundartangi would repurchase the same number of Carbon Credits at a price of €83.72 per Carbon Credit, for an aggregate amount of €32.7 million. The Original Carbon Credit Agreement was amended in December 2023, March 2024, August 2024 and December 2024, in each case to extend the repurchase window and increase the repurchase price (collectively, the "Amended Carbon Credit Agreement"). The Amended Carbon Credit Agreement (i) settled 19,300 Carbon Credits, (ii) extended the repurchase window from December 2024 to August 2025 for the remaining 370,700 Carbon Credits and (iii) revised the repurchase price to €69.16 per Carbon Credit, for an aggregate amount of €25.6 million. In August 2025, all 370,700 Carbon Credits subject to the Amended Carbon Credit Agreement were settled in full.
In December 2023, Grundartangi also entered into a second structured repurchase agreement with Glencore pursuant to which it sold 40,000 Carbon Credits at a price of €69.30 per Carbon Credit and agreed to repurchase the same number of Carbon Credits at a price of €70.71 per Carbon Credit for an aggregate amount of €2.8 million (the "Second Carbon Credit Agreement"). In March 2024 and August 2024, the Second Carbon Credit Agreement was amended to (i) increase the number of Carbon Credits subject to the Second Carbon Agreement by 19,300 credits, (ii) extend the repurchase window from March 2024 to August 2024 with respect to all 59,300 Carbon Credits and (iii) revise the purchase price to €186.74 per Carbon Credit, for an aggregate amount of €11.1 million. In August 2024, all 59,300 Carbon Credits subject to the Second Carbon Credit Agreement were settled in full.
Due to the repurchase element of these transactions, the Company retains substantially all of the remaining benefits of the assets and has accounted for the transaction as a financing arrangement in accordance with Revenue from Contracts with Customers Topic of the FASB ASC.