Century Aluminum Company
US ˙ NasdaqGS ˙ US1564311082

SecurityCENX / Century Aluminum Company
InstitutionWolverine Trading, Llc
Latest Disclosed Ownership21,227 shares
Latest Disclosed Value $ 623,968
Wolverine Trading, Llc ownership in CENX / Century Aluminum Company

On November 14, 2025 - Wolverine Trading, Llc filed a 13F-HR form disclosing ownership of 21,227 shares of Century Aluminum Company (US:CENX) valued at $623,225 USD as of September 30, 2025. The entity filed a previous 13F-HR on February 14, 2024 disclosing 0 shares of Century Aluminum Company. The current value of the position is $1,422,952 USD.

Wolverine Trading, Llc has a history of taking positions in derivatives of the underlying security (CENX) in the form of stock options. The firm currently holds call options representing 63,800 of underlying shares valued at $1,875,401 USD and put options representing 26,000 of underlying shares valued at $764,270 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

CENX / Century Aluminum Company Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2025-11-14 2025-09-30 13F CENTURY ALUM COM 156431108 21,227 21,227 624 0.0004
2024-02-14 2023-12-31 13F CENTURY ALUM COM 156431108 0 -12,296 -100.00 0 -100.00
2023-11-15 2023-09-30 13F CENTURY ALUM COM 156431108 12,296 -5,483 -30.84 88 -43.59 0.0001
2023-08-23 2023-06-30 13F CENTURY ALUM COM 156431108 17,779 17,779 156 0.0002
2023-05-15 2023-03-31 13F CENTURY ALUM COM 156431108 0 -10,195 -100.00 0 -100.00
2023-02-14 2022-12-31 13F CENTURY ALUM COM 156431108 10,195 10,195 83 0.0001
2022-11-14 2022-09-30 13F CENTURY ALUM COM 156431108 0 -19,312 -100.00 0 -100.00
2022-08-15 2022-06-30 13F CENTURY ALUM COM 156431108 19,312 19,312 144 0.0002
2021-11-12 2021-09-30 13F CENTURY ALUM COM 156431108 0 -16,560 -100.00 0 -100.00
2021-08-06 2021-06-30 13F CENTURY ALUM COM 156431108 16,560 -9,017 -35.25 212 -52.04 0.0003
2021-05-14 2021-03-31 13F CENTURY ALUM COM 156431108 25,577 25,577 54.45 442 108.49 0.0007
2019-11-14 2019-09-30 13F CENTURY ALUM COM 156431108 0 -17,785 -100.00 0 -100.00
2019-08-20 2019-06-30 13F CENTURY ALUM COM 156431108 17,785 17,785 123 0.0003
2019-05-15 2019-03-31 13F CENTURY ALUM COM 156431108 0 -35,365 -100.00 0 -100.00
2019-02-13 2018-12-31 13F CENTURY ALUM COM 156431108 35,365 35,365 262 0.0007
2018-11-14 2018-09-30 13F CENTURY ALUM COM 156431108 0 -34,170 -100.00 0 -100.00
2018-08-13 2018-06-30 13F CENTURY ALUM COM 156431108 34,170 0 0.00 565 0.00 0.0013
2018-05-15 2018-03-31 13F CENTURY ALUM COM 156431108 34,170 34,170 0.00 565 0.00 0.0013
2017-11-15 2017-09-30 13F CENTURY ALUM COM 156431108 0 -13,215 -100.00 0 -100.00
2017-08-14 2017-06-30 13F CENTURY ALUM COM 156431108 13,215 2,858 27.59 209 231.75 0.0010
2016-08-17 2016-06-30 13F/A-1 CENTURY ALUM COM 156431108 10,357 10,357 63 0.0004
2016-08-15 2016-06-30 13F CENTURY ALUM COM 156431108 10,357 10,202 63
Disclosed Call Options
File
Date		 Effective
Date		Form Security Class ID Opt Avg Share
Price		 Shares ΔShares
(%)		 Value
(x1000)		 ΔValue
(%)		 Prior Allocation
(%)		 Allocation
(%)		 ΔAllocation
(%)		 Cost Basis
(x1000)		 Profit
(x1000)		 Return
(%)
2025-11-14 2025-09-30 13F CENTURY ALUM COM Call 63,800 28.37 1,875 109.03 n/a n/a n/a
2025-08-18 2025-06-30 13F CENTURY ALUM COM Call 49,700 -15.76 897 -18.08 n/a n/a n/a
2025-05-15 2025-03-31 13F CENTURY ALUM COM Call 59,000 10.28 1,095 12.31 n/a n/a n/a
2025-02-14 2024-12-31 13F CENTURY ALUM COM Call 53,500 29.54 975 46.40 n/a n/a n/a
2024-11-14 2024-09-30 13F CENTURY ALUM COM Call 41,300 31.95 667 27.10 n/a n/a n/a
2024-08-14 2024-06-30 13F CENTURY ALUM COM Call 31,300 125.18 524 146.01 n/a n/a n/a
2024-05-15 2024-03-31 13F CENTURY ALUM COM Call 13,900 214 n/a n/a n/a
2024-02-14 2023-12-31 13F CENTURY ALUM COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-15 2023-09-30 13F CENTURY ALUM COM Call 25,100 -28.90 180 -41.94 n/a n/a n/a
2023-08-23 2023-06-30 13F CENTURY ALUM COM Call 35,300 6.01 310 n/a n/a n/a
2023-05-15 2023-03-31 13F CENTURY ALUM COM Call 33,300 12.50 0 -100.00 n/a n/a n/a
2023-02-14 2022-12-31 13F CENTURY ALUM COM Call 29,600 -10.57 242 13.08 n/a n/a n/a
2022-11-14 2022-09-30 13F CENTURY ALUM COM Call 33,100 -34.46 214 -43.09 n/a n/a n/a
2022-08-15 2022-06-30 13F CENTURY ALUM COM Call 50,500 376 n/a n/a n/a
2022-02-14 2021-12-31 13F CENTURY ALUM COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-11-12 2021-09-30 13F CENTURY ALUM COM Call 25,600 20.75 340 25.46 n/a n/a n/a
2021-08-06 2021-06-30 13F CENTURY ALUM COM Call 21,200 271 n/a n/a n/a
2020-11-13 2020-09-30 13F CENTURY ALUM COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-13 2020-06-30 13F CENTURY ALUM COM Call 13,800 -60.34 96 -17.95 n/a n/a n/a
2020-05-11 2020-03-31 13F CENTURY ALUM COM Call 34,800 -9.38 117 -58.95 n/a n/a n/a
2020-02-12 2019-12-31 13F CENTURY ALUM COM Call 38,400 54.22 285 71.69 n/a n/a n/a
2019-11-14 2019-09-30 13F CENTURY ALUM COM Call 24,900 23.27 166 18.57 n/a n/a n/a
2019-08-20 2019-06-30 13F CENTURY ALUM COM Call 20,200 -5.61 140 -26.32 n/a n/a n/a
2019-05-15 2019-03-31 13F CENTURY ALUM COM Call 21,400 -41.37 190 -29.63 n/a n/a n/a
2019-02-13 2018-12-31 13F CENTURY ALUM COM Call 36,500 -54.55 270 -71.90 n/a n/a n/a
2018-11-14 2018-09-30 13F CENTURY ALUM COM Call 80,300 6.78 961 -22.75 n/a n/a n/a
2018-08-13 2018-06-30 13F CENTURY ALUM COM Call 75,200 0.00 1,244 0.00 n/a n/a n/a
2018-05-15 2018-03-31 13F CENTURY ALUM COM Call 75,200 27.67 1,244 7.52 n/a n/a n/a
2018-02-14 2017-12-31 13F CENTURY ALUM COM Call 58,900 95.68 1,157 131.86 n/a n/a n/a
2017-11-15 2017-09-30 13F CENTURY ALUM COM Call 30,100 22.86 499 28.94 n/a n/a n/a
2017-08-14 2017-06-30 13F CENTURY ALUM COM Call 24,500 7.46 387 149.68 n/a n/a n/a
2016-11-14 2016-09-30 13F CENTURY ALUM COM Call 22,800 5.07 155 17.42 n/a n/a n/a
2016-08-17 2016-06-30 13F/A CENTURY ALUM COM Call 21,700 132 n/a n/a n/a
2016-08-15 2016-06-30 13F CENTURY ALUM COM Call 217 132 n/a n/a n/a
Disclosed Put Options
File
Date		 Effective
Date		Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)		 Value
(x1000)		 ΔValue
(%)		 Prior Allocation
(%)		 Allocation
(%)		 ΔAllocation
(%)		 Cost Basis
(x1000)		 Profit
(x1000)		 Return
(%)
2025-11-14 2025-09-30 13F CENTURY ALUM COM Put 26,000 45.25 764 136.53 n/a n/a n/a
2025-08-18 2025-06-30 13F CENTURY ALUM COM Put 17,900 29.71 323 26.17 n/a n/a n/a
2025-05-15 2025-03-31 13F CENTURY ALUM COM Put 13,800 -34.29 256 -32.98 n/a n/a n/a
2025-02-14 2024-12-31 13F CENTURY ALUM COM Put 21,000 48.94 383 68.28 n/a n/a n/a
2024-11-14 2024-09-30 13F CENTURY ALUM COM Put 14,100 -29.50 228 -32.24 n/a n/a n/a
2024-08-14 2024-06-30 13F CENTURY ALUM COM Put 20,000 11.73 335 21.82 n/a n/a n/a
2024-05-15 2024-03-31 13F CENTURY ALUM COM Put 17,900 275 n/a n/a n/a
2024-02-14 2023-12-31 13F CENTURY ALUM COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-15 2023-09-30 13F CENTURY ALUM COM Put 16,300 -22.01 117 -36.07 n/a n/a n/a
2023-08-23 2023-06-30 13F CENTURY ALUM COM Put 20,900 44.14 184 n/a n/a n/a
2023-05-15 2023-03-31 13F CENTURY ALUM COM Put 14,500 -5.23 0 -100.00 n/a n/a n/a
2023-02-14 2022-12-31 13F CENTURY ALUM COM Put 15,300 -42.26 125 -26.90 n/a n/a n/a
2022-11-14 2022-09-30 13F CENTURY ALUM COM Put 26,500 -48.34 171 -55.24 n/a n/a n/a
2022-08-15 2022-06-30 13F CENTURY ALUM COM Put 51,300 382 n/a n/a n/a
2022-02-14 2021-12-31 13F CENTURY ALUM COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-11-12 2021-09-30 13F CENTURY ALUM COM Put 16,100 -32.07 214 -29.37 n/a n/a n/a
2021-08-06 2021-06-30 13F CENTURY ALUM COM Put 23,700 65.73 303 22.67 n/a n/a n/a
2021-05-14 2021-03-31 13F CENTURY ALUM COM Put 14,300 -39.66 247 -18.48 n/a n/a n/a
2020-11-13 2020-09-30 13F CENTURY ALUM COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-13 2020-06-30 13F CENTURY ALUM COM Put 10,200 -38.18 71 26.79 n/a n/a n/a
2020-05-11 2020-03-31 13F CENTURY ALUM COM Put 16,500 -54.92 56 -79.41 n/a n/a n/a
2020-02-12 2019-12-31 13F CENTURY ALUM COM Put 36,600 -28.79 272 -20.70 n/a n/a n/a
2019-11-14 2019-09-30 13F CENTURY ALUM COM Put 51,400 7.08 343 3.31 n/a n/a n/a
2019-08-20 2019-06-30 13F CENTURY ALUM COM Put 48,000 -16.67 332 -35.03 n/a n/a n/a
2019-05-15 2019-03-31 13F CENTURY ALUM COM Put 57,600 -16.88 511 -0.39 n/a n/a n/a
2019-02-13 2018-12-31 13F CENTURY ALUM COM Put 69,300 116.56 513 33.94 n/a n/a n/a
2018-11-14 2018-09-30 13F CENTURY ALUM COM Put 32,000 -50.31 383 -64.04 n/a n/a n/a
2018-08-13 2018-06-30 13F CENTURY ALUM COM Put 64,400 0.00 1,065 0.00 n/a n/a n/a
2018-05-15 2018-03-31 13F CENTURY ALUM COM Put 64,400 186.22 1,065 140.95 n/a n/a n/a
2018-02-14 2017-12-31 13F CENTURY ALUM COM Put 22,500 -36.62 442 -24.96 n/a n/a n/a
2017-11-15 2017-09-30 13F CENTURY ALUM COM Put 35,500 -7.79 589 -3.12 n/a n/a n/a
2017-08-14 2017-06-30 13F CENTURY ALUM COM Put 38,500 45.28 608 235.91 n/a n/a n/a
2016-11-14 2016-09-30 13F CENTURY ALUM COM Put 26,500 70.97 181 92.55 n/a n/a n/a
2016-08-17 2016-06-30 13F/A CENTURY ALUM COM Put 15,500 94 n/a n/a n/a
2016-08-15 2016-06-30 13F CENTURY ALUM COM Put 155 94 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.