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WESTFIELD CAPITAL MANAGEMENT CO LP

Position in CLH — Clean Harbors Inc

CIK 1177719 BOSTON, MA

Position in CLH

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$80,168,965
+$5,306,056 QoQ
Shares Held
268,348
+2.8% QoQ
Ownership
0.508%
of shares outstanding
% of Portfolio
0.26%
of 13F equity value
Holder Rank
#41
of 660 holders
Holding Since
Jun 2025
5 quarters on record
Voting authority Sole 91% Shared 0% None 9%

Common Shares in CLH Over Time

Shares Held

Position Value (USD)

Position in Waste Management

Industrials · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $159,703,951 across 3 Waste Management names. CLH ranks #1 (50.2% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 CLH
Clean Harbors Inc
This page
268,348 $80,168,965

All Filings in CLH

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5 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $80,168,965 268,348
2026-03-31 $74,862,909 261,092
2025-12-31 $57,586,881 245,594
2025-09-30 $56,564,612 243,582
2025-06-30 $44,446,435 192,259