WESTFIELD CAPITAL MANAGEMENT CO LP

Position in FAST — Fastenal Co

CIK 1177719 BOSTON, MA

Position in FAST

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

Position Value

$27,497,078

-$2,121,619 QoQ

Shares Held

572,498

-10.3% QoQ

Ownership

0.050%

of shares outstanding

% of Portfolio

0.09%

of 13F equity value

Holder Rank

#157

of 1,453 holders

Holding Since

Mar 2026

2 quarters on record

Voting authority Sole 80% Shared 0% None 20%

Industrials · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $128,190,360 across 3 Industrial Distribution names. FAST ranks #2 (21.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	AIT	Applied Industrial Technologies Inc	285,691	$96,606,411
2	FAST	Fastenal Co This page	572,498	$27,497,078
3	WSO	Watsco Inc	9,807	$4,086,871

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$27,497,078	572,498	-10.3%	Shares	Sole	2026-08-12
2026-03-31	$29,618,697	638,334	—	Shares	Sole	2026-05-11
No filing history on record for this holder in this stock.