Question 1

Who are the insiders buying CENTURY ALUMINUM CO stock?

Accepted Answer

InsiderAct tracks all open-market purchases of CENTURY ALUMINUM CO stock by corporate insiders — including officers, directors, and shareholders owning more than 10% — sourced from public SEC Form 4 filings.

Question 2

What does insider buying at a company mean?

Accepted Answer

When a corporate officer, director, or major shareholder purchases their own company's stock on the open market using personal funds, it signals confidence in the company's outlook. This is especially meaningful when multiple insiders buy within the same 7–14 day window (cluster buying) or when the purchase size exceeds $100,000.

Question 3

How do I find cluster buying signals for a company?

Accepted Answer

InsiderAct automatically detects cluster buying — two or more insiders independently purchasing shares within a 14-day window. When a cluster buy signal is active for a company, it appears prominently on the company's InsiderAct page and on the Signals tab.

Question 4

Has CENTURY ALUMINUM CO had any recent large insider purchases?

Accepted Answer

InsiderAct tracks all open-market purchases of $100,000 or more at CENTURY ALUMINUM CO. Large insider purchases are flagged as high-conviction signals because they represent meaningful personal capital commitments by executives or directors who have direct visibility into the company's operations and prospects.

Question 5

Where do the insider transactions on this page come from?

Accepted Answer

All transactions shown on InsiderAct company pages are sourced directly from SEC EDGAR Form 4 filings — the mandatory public disclosures that corporate insiders must submit within 2 business days of any stock transaction. InsiderAct ingests these filings in near real time and filters for open-market purchases and sales.

								1WStock price change 1 week after insider bought. Small number below shows return vs S&P 500.	1MStock price change 1 month after insider bought.
2026-03-27	2026-03-25	Trpkovski Peter A	CFO	Sale	16,739	$50.51	$845,487	N/A	N/A
2026-03-17	2026-03-16	Gary Jesse E	CEO	Sale	150,000	$55.47	$8,320,500	N/A	N/A
2026-03-13	2026-03-12	Calloway Kenneth L	SVP	Sale	18,000	$58.00	$1,044,000	N/A	N/A
2026-03-13	2026-03-11	Hoffman Robert F	CAO	Sale	10,529	$56.51	$594,994	N/A	N/A
2026-03-06	2026-03-04	Hoffman Robert F	CAO	Sale	10,000	$56.33	$563,300	N/A	N/A
2026-03-04	2026-03-03	Aboud Matt	SVP	Sale	2,971	$52.67	$156,483	N/A	N/A
2026-03-04	2026-03-02	Aboud Matt	SVP	Sale	12,126	$52.50	$636,615	N/A	N/A
2026-03-04	2026-03-04	Glencore International Ag	10% Owner	Sale	6,315,245	$51.75	$326,813,929⚠️	N/A	N/A
2026-03-03	2026-02-27	Hafberg Agust F	CCO	Sale	22,884	$51.24	$1,172,576	N/A	N/A
2026-02-27	2026-02-25	Gudlaugsson Gunnar	EVP	Sale	43,000	$54.10	$2,326,300	N/A	N/A

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