Peter A. Trpkovski

CENX

SVP, FINANCE AND TREASURER · CENTURY ALUMINUM CO · CIK 0001980271

FILING MIX · LIFETIME38%/62%

BUYS

SELLS

TOTAL VALUE

$1.90M

COMPANIES

ACTIVE SINCE

Dec 2023

HOLDINGS NOW

64,125

AVG SELL PX

$32.53

Trades · vs SPY

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Performance · forward returns vs SPY

2 backtested trades · 8 horizons · 3 pendingHow are these numbers computed? →

Forward-return performance of every backtestable P/S trade by Peter A. Trpkovski, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.

HORIZON	TRADES	WIN RATE	INSIDER RETURN	SPY RETURN	MEAN EXCESS	MEDIAN EXCESS	T-STAT
7d	2	+50.00%	+6.32%	-1.11%	+7.43%	+7.43%	—
14d	2	+50.00%	+10.07%	+1.43%	+8.65%	+8.65%	—
30d	2	+50.00%	+6.21%	+5.47%	+0.74%	+0.74%	—
60d	2	+50.00%	-0.23%	+6.15%	-27.06%	-27.06%	—
90d	2	+50.00%	+7.32%	+11.71%	-4.39%	-4.39%	—
180d	2(1 pending)	+0.00%	+30.23%	+15.02%	+15.21%	+15.21%	—
1y	2(1 pending)	+0.00%	+45.30%	+26.42%	+18.88%	+18.88%	—
2y	2(1 pending)	+0.00%	+217.13%	+47.11%	+170.02%	+170.02%	—

How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.

Holdings over time

CENX · 64,125 shares · as of Mar 25, 2026

Trading cadence · quarterly flow

BUY ● SELL ●

2023

2024

2025

2026

FLOW · 6 buys / 10 sellsCOVERAGE · 10 quarters

Form 4 filings · all activity

COMPANY	TYPE	SHARES	PRICE	VALUE	HELD AFTER	TRADE DATE	FILED	DETAILS
CENX CENTURY ALUMINUM CO	SALE EVP, CFO	16,739	$50.51	$845.5K	64,125	Mar 25, 2026	Mar 27, 2026 ↗	View →
CENX CENTURY ALUMINUM CO	SALE EVP, CFO	4,240	$54.36	$230.5K	80,864	Feb 9, 2026	Feb 11, 2026 ↗	View →
CENX CENTURY ALUMINUM CO	PURCHASEGRANT Stock grant	13,488	—	—	85,104	Jan 1, 2026	Jan 5, 2026 ↗	View →
CENX CENTURY ALUMINUM CO	SALE EVP, CFO and Treasurer	4,045	$39.18	$158.5K	71,616	Dec 31, 2025	Jan 5, 2026 ↗	View →
CENX CENTURY ALUMINUM CO	PURCHASEGRANT Stock grant	18,260	—	—	83,751	Dec 31, 2025	Jan 5, 2026 ↗	View →
CENX CENTURY ALUMINUM CO	SALE EVP, CFO and Treasurer	8,090	$39.18	$317.0K	75,661	Dec 31, 2025	Jan 5, 2026 ↗	View →
CENX CENTURY ALUMINUM CO	PURCHASEGRANT Stock grant	12,455	—	—	65,491	Mar 21, 2025	Mar 25, 2025 ↗	View →
CENX CENTURY ALUMINUM CO	SALE SVP, Finance and Treasurer	4,501	$18.69	$84.1K	53,036	Feb 7, 2025	Feb 10, 2025 ↗	View →
CENX CENTURY ALUMINUM CO	PURCHASEGRANT Stock grant	6,046	—	—	57,537	Jan 1, 2025	Jan 3, 2025 ↗	View →
CENX CENTURY ALUMINUM CO	SALE SVP, Finance and Treasurer	703	$18.22	$12.8K	51,491	Dec 31, 2024	Jan 3, 2025 ↗	View →
CENX CENTURY ALUMINUM CO	SALE SVP, Finance and Treasurer	2,049	$18.22	$37.3K	52,194	Dec 31, 2024	Jan 3, 2025 ↗	View →
CENX CENTURY ALUMINUM CO	PURCHASEGRANT Stock grant	4,624	—	—	54,243	Dec 31, 2024	Jan 3, 2025 ↗	View →
CENX CENTURY ALUMINUM CO	SALE SVP, Finance and Treasurer	3,211	$10.42	$33.5K	49,619	Feb 9, 2024	Feb 13, 2024 ↗	View →
CENX CENTURY ALUMINUM CO	PURCHASEGRANT Stock grant	11,841	—	—	52,830	Jan 1, 2024	Jan 2, 2024 ↗	View →
CENX CENTURY ALUMINUM CO	SALE SVP, Finance and Treasurer	1,009	$12.14	$12.2K	40,989	Dec 31, 2023	Jan 2, 2024 ↗	View →
CENX CENTURY ALUMINUM CO	SALE SVP, Finance and Treasurer	13,908	$12.32	$171.3K	41,998	Dec 28, 2023	Jan 2, 2024 ↗	View →

Other insiders · CENX

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About this filer

CIK 0001980271

ROLE

SVP, Finance and Treasurer

PRIMARY

CENX

COMPANIES

ACTIVE SINCE

Dec 2023

MARKETPEEL · /INSIDER/0001980271DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE

Peter A. Trpkovski

The morning brief, before the bell.