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SCHEDULE Filed 2025-11-12 Event 2025-11-10 SEC 0001104659-25-109946 →

GLENCORE INTERNATIONAL AG → CENTURY ALUMINUM CO CENX

Stake: 36.60% Shares: 36,005,947 CUSIP: 156431108 Class: Common Stock, $0.01 Par Value
Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 28/100 · Filer 90d Win Rate: 100% · Hist. 90d Edge: +68.3%
  • Passive Schedule 13G filer baseline
  • High conviction ownership stake (36.6%)
  • Held by 1 tracked 13F institutional manager
  • 18 NPORT-P mutual funds holding CUSIP
  • Moderate short days-to-cover (4.8 DTC)

Item 4 — Purpose of Transaction

The Reporting Persons remain confident in the management team and outlook of the Company, maintain a position in the Company and intend to continue to hold Common Stock for investment purposes. Since the Company's initial public offering in 1996, in which the Reporting Persons sold approximately 60% of their Common Stock, the Reporting Persons have held Common Stock, and have acquired additional securities of the Company, for investment purposes. On November 10, 2025, the Reporting Persons decided to rebalance and optimize its global aluminium investment portfolio, and thereby took action to monetize a portion of their investment via a sale of 9,000,000 shares in a block trade pursuant to Rule 144 and subject to customary conditions (the "Subject Sale"). Reference is made to Item 6 of the Statement and the Certificate of Designation for the Series A Preferred Shares, all of which automatically converted into Common Stock upon consummation of the Subject Sale. The Reporting Persons may also purchase or sell additional shares of Common Stock and other securities of the Issuer. Such transactions could be in the open market and/or in privately negotiated or structured transactions, provided that any such transactions would be on terms deemed favorable by the Reporting Persons. In addition, the Reporting Persons may formulate plans or proposals for, hold discussions with the Company's management, the Company's Board of Directors, the Company's stockholders and other parties about, and reserve the right to explore, or make plans or proposals relating to, transactions, discussions or actions which relate to or would result in any of the matters specified in clauses (a) through (j) of Item 4 of Schedule 13D. The Reporting Persons' consideration or discussion of any action would be based on their own assessment of various relevant considerations and any subsequent developments affecting the Company and its prospects.

Cross-References

Insider Activity (last 365d)
49 transactions
16 buys · 13 sales · 1 awards/exercises
Issuer Cluster
4 13D/G filings on this issuer
3 other filings besides this one
Filer Track Record
5 filings by this filer
4 other filings in the data moat
Short Interest · settle 2026-10-15
DTC 4.82
9,424,866 shares short · +2.6% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers
1 holder · $7.71M
Point72 Asset Mgmt

Post-Filing Returns · since 2025-11-10 on CENX

+1 day
-13.7%
+5 days
-13.2%
+30 days
-6.3%
+60 days
+41.4%
+90 days
+68.2%
+180 days
+86.3%

Anchor price 32.31 on closest trading day on/after 2025-11-10. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-03-25 Trpkovski Peter A officer Sale 16,739 $50.51 $845K
2026-03-16 Gary Jesse E director, officer Sale 150,000 $55.47 $8.32M
2026-03-12 Calloway Kenneth L officer Sale 18,000 $58.00 $1.04M
2026-03-11 Hoffman Robert F officer Sale 10,529 $56.51 $595K
2026-03-04 Hoffman Robert F officer Sale 10,000 $56.33 $563K
2026-03-04 GLENCORE INTERNATIONAL AG 10%+ owner Sale 6,315,245 $51.75 $326.81M
2026-03-03 Aboud Matt officer Sale 2,971 $52.67 $156K
2026-03-02 Aboud Matt officer Sale 12,126 $52.50 $637K
2026-02-27 Hafberg Agust F officer Sale 22,884 $51.24 $1.17M
2026-02-25 Gudlaugsson Gunnar officer Sale 43,000 $54.10 $2.33M
2026-02-23 DeZee John officer Sale 66,000 $50.72 $3.35M
2026-02-09 Trpkovski Peter A officer F 4,240 $54.36 $230K
2026-01-23 Gary Jesse E director, officer Sale 150,000 $48.19 $7.23M
2026-01-12 Gary Jesse E director, officer Gift 314,611 — —
2026-01-01 Aboud Matt officer Award 5,529 — —
2026-01-01 Calloway Kenneth L officer Award 5,238 — —
2026-01-01 DeZee John officer Award 9,821 — —
2026-01-01 Hoffman Robert F officer Award 5,122 — —
2026-01-01 Trpkovski Peter A officer Award 13,488 — —
2026-01-01 Hafberg Agust F officer Award 5,238 — —
2026-01-01 Gudlaugsson Gunnar officer Award 15,624 — —
2026-01-01 Gary Jesse E director, officer Award 57,443 — —
2025-12-31 Gary Jesse E director, officer Award 439,090 — —
2025-12-31 Gudlaugsson Gunnar officer Award 82,794 — —
2025-12-31 Hafberg Agust F officer Award 30,878 — —
Showing 25 of 49

Other 13D/G Filings on CENTURY ALUMINUM CO

FiledFormFilerStakeShares
2024-01-05 SC GLENCORE INTERNATIONAL AG — — view →
2020-09-30 SC GLENCORE INTERNATIONAL AG — — view →
2020-08-20 SC GLENCORE INTERNATIONAL AG — — view →

Other Filings by GLENCORE INTERNATIONAL AG

FiledFormIssuerStakeShares
2026-05-22 SCHEDULE 13G Chilean Cobalt Corp. COBA — — view →
2024-01-05 SC CENTURY ALUMINUM CO CENX — — view →
2020-09-30 SC CENTURY ALUMINUM CO CENX — — view →
2020-08-20 SC CENTURY ALUMINUM CO CENX — — view →

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