WESTFIELD CAPITAL MANAGEMENT CO LP

Position in WCN — Waste Connections, Inc.

CIK 1177719 BOSTON, MA

Position in WCN

as of Mar 31, 2026 · filed May 11, 2026 Compact

Position Value

$725,457

-$54,210,622 QoQ

Shares Held

4,466

-98.6% QoQ

Ownership

0.002%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Industrials · as of Mar 31, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $140,844,881 across 3 Waste Management names. WCN ranks #3 (0.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CLH	Clean Harbors Inc	261,092	$74,862,909
2	CWST	Casella Waste Systems Inc	822,492	$65,256,515
3	WCN	Waste Connections, Inc. This page	4,466	$725,457

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$725,457	4,466	-98.6%	Shares	Sole	2026-05-11
2025-12-31	$54,936,079	313,276	+8.5%	Shares	Sole	2026-02-11
2025-09-30	$50,758,734	288,730	-13.8%	Shares	Sole	2025-11-12
2025-06-30	$62,554,747	335,019	-2.1%	Shares	Sole	2025-08-12
2025-03-31	$66,762,202	342,037	-1.6%	Shares	Sole	2025-05-09
2024-12-31	$59,629,368	347,531	-2.0%	Shares	Sole	2025-02-11
2024-09-30	$63,410,644	354,606	-0.3%	Shares	Sole	2024-11-12
2024-06-30	$62,376,253	355,704	-3.9%	Shares	Sole	2024-08-14
2024-03-31	$63,650,924	370,042	-3.0%	Shares	Sole	2024-05-10
2023-12-31	$56,946,654	381,501	+2.5%	Shares	Sole	2024-02-09
2023-09-30	$49,997,741	372,284	-3.5%	Shares	Sole	2023-11-13
2023-06-30	$55,118,095	385,630	-2.7%	Shares	Sole	2023-08-11
2023-03-31	$55,141,672	396,503	+10.7%	Shares	Sole	2023-05-12
2022-12-31	$47,465,494	358,068	+1.1%	Shares	Sole	2023-02-13
2022-09-30	$47,869,261	354,246	+3.0%	Shares	Sole	2022-11-14
2022-06-30	$42,620,547	343,825	-15.7%	Shares	Sole	2022-08-12
2022-03-31	$56,987,122	407,925	+19.5%	Shares	Sole	2022-05-16
2021-12-31	$46,508,405	341,296	-3.1%	Shares	Sole	2022-02-10
2021-09-30	$44,341,464	352,112	-9.8%	Shares	Sole	2021-11-12
2021-06-30	$46,614,603	390,309	-10.0%	Shares	Sole	2021-08-10
2021-03-31	$46,814,513	433,548	+72.0%	Shares	Sole	2021-05-14
2020-12-31	$25,855,845	252,080	-5.6%	Shares	Sole	2021-02-12
2020-09-30	$27,730,481	267,153	-3.2%	Shares	Sole	2020-11-13
2020-06-30	$25,876,942	275,903	-8.9%	Shares	Sole	2020-08-13
2020-03-31	$23,481,957	302,993	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.