Agust F. Hafberg

CIK: 0002049924

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)2 (20.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (40.0%)

Compensation grants

Other (G, F, J, C, D, …)4 (40.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

CENX

CENTURY ALUMINUM CO

Officer

Discretionary Trading P&L

Holdings

Transaction History (10 total)

CENX
CENTURY ALUMINUM CO
Feb 27, 2026
Sale(S)
Direct
22.9K shares at avg. $51.24$1.2M
CENX
CENTURY ALUMINUM CO
Jan 1, 2026
Award(A)
Direct
5.2K shares-
CENX
CENTURY ALUMINUM CO
Dec 31, 2025
Award(A)
Direct
30.9K shares-
CENX
CENTURY ALUMINUM CO
Dec 31, 2025
Tax Payment(F)
Direct
15.6K shares at avg. $39.18$612K
CENX
CENTURY ALUMINUM CO
Dec 31, 2025
Tax Payment(F)
Direct
7.8K shares at avg. $39.18$306K
CENX
CENTURY ALUMINUM CO
Sep 26, 2025
Sale(S)
Direct
9.5K shares at avg. $27.91$265K
CENX
CENTURY ALUMINUM CO
Jan 1, 2025
Award(A)
Direct
7.8K shares-
CENX
CENTURY ALUMINUM CO
Dec 31, 2024
Award(A)
Direct
14.3K shares-
CENX
CENTURY ALUMINUM CO
Dec 31, 2024
Tax Payment(F)
Direct
7.2K shares at avg. $18.22$132K
CENX
CENTURY ALUMINUM CO
Dec 31, 2024
Tax Payment(F)
Direct
2.5K shares at avg. $18.22$45K

		Type	Shares	Price		Ownership
Feb 27, 2026	CENX CENTURY ALUMINUM CO	Sale(S)	22,884	$51.24	$1,172,576	Direct
Jan 1, 2026	CENX CENTURY ALUMINUM CO	Award(A)	5,238	-	$0	Direct
Dec 31, 2025	CENX CENTURY ALUMINUM CO	Award(A)	30,878	-	$0	Direct
Dec 31, 2025	CENX CENTURY ALUMINUM CO	Tax Payment(F)	15,622	$39.18	$612,070	Direct
Dec 31, 2025	CENX CENTURY ALUMINUM CO	Tax Payment(F)	7,811	$39.18	$306,035	Direct
Sep 26, 2025	CENX CENTURY ALUMINUM CO	Sale(S)	9,493	$27.91	$264,950	Direct
Jan 1, 2025	CENX CENTURY ALUMINUM CO	Award(A)	7,787	-	$0	Direct
Dec 31, 2024	CENX CENTURY ALUMINUM CO	Award(A)	14,304	-	$0	Direct
Dec 31, 2024	CENX CENTURY ALUMINUM CO	Tax Payment(F)	7,235	$18.22	$131,822	Direct
Dec 31, 2024	CENX CENTURY ALUMINUM CO	Tax Payment(F)	2,481	$18.22	$45,204	Direct

1-10 of 10 transactions

About Hafberg Agust F

Hafberg Agust F (SEC CIK 0002049924) files insider reports with the SEC as SVP & Chief Commercial Officer of CENTURY ALUMINUM CO (CENX).

Signal8 holds 5 ownership filings by Hafberg Agust F (1 Form 3, 4 Form 4), filed between Dec 26, 2024 and Mar 3, 2026. Those filings report 10 transactions, from Dec 31, 2024 to Feb 27, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Hafberg Agust F's filings is in CHICAGO, IL.

Recent filings by Hafberg Agust F

Feb 27, 2026: Open-market sale of CENX shares (Form 4, code S).
Jan 1, 2026: Grant or award of CENX shares (Form 4, code A).
Dec 31, 2025: Grant or award of CENX shares (Form 4, code A).
Dec 31, 2025: Tax withholdings of CENX shares (2 lines, Form 4, code F).
Sep 26, 2025: Open-market sale of CENX shares (Form 4, code S).

Other insiders filing for CENTURY ALUMINUM CO (CENX)

Berntzen Jarl, Director
GLASSER ERROL, Director
Michelmore Andrew G, Director
Bush Jennifer Mary, Director
Olivier Tamla A, Director
Trpkovski Peter A, EVP, CFO

How to read Form 4 transaction codes