WESTFIELD CAPITAL MANAGEMENT CO LP

Position in KALU — Kaiser Aluminum Corp

CIK 1177719 BOSTON, MA

Position in KALU

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$31,978,657

New position

Shares Held

163,465

first reported quarter

Ownership

1.000%

of shares outstanding

% of Portfolio

0.11%

of 13F equity value

Holder Rank

#22

of 335 holders

Holding Since

Jun 2026

1 quarter on record

Voting authority Sole 95% Shared 0% None 5%

Basic Materials · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $31,978,657 across 1 Aluminum name. KALU ranks #1 (100.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	KALU	Kaiser Aluminum Corp This page	163,465	$31,978,657

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$31,978,657	163,465	—	Shares	Sole	2026-08-12
No filing history on record for this holder in this stock.