William Blair Investment Management’s Waste Connections WCN Stock Holding History

William Blair Investment Management’s Portfolio WCN Stock Details WCN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-339,466	Closed	-$63.4M	–	454
2025 Q2	$63.4M	Buy	+339,466	New	+$65.4M	0.17%	128
2020 Q3	–	Sell	-151,368	Closed	-$14.2M	–	365
2020 Q2	$14.2M	Sell	151,368 -7,158	-5%	-$638K	0.06%	211
2020 Q1	$12.3M	Sell	158,526 -5,500	-3%	-$517K	0.06%	221
2019 Q4	$14.9M	Sell	164,026 -14,166	-8%	-$1.29M	0.06%	230
2019 Q3	$16.4M	Buy	178,192 +1,160	+0.7%	+$107K	0.07%	238
2019 Q2	$16.9M	Buy	177,032 +25,684	+17%	+$2.37M	0.07%	242
2019 Q1	$13.4M	Sell	151,348 -5,632	-4%	-$464K	0.06%	284
2018 Q4	$11.7M	Sell	156,980 -346,340	-69%	-$26.4M	0.06%	280
2018 Q3	$40.1M	Buy	+503,320	New	+$39.5M	0.14%	170

Other funds holding WCN

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Royal Bank of Canada Toronto, Ontario, Canada $570B AUM 27.57% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Bank of Montreal Toronto, Ontario, Canada $269B AUM 31.4% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

WCM Investment Management Laguna Beach, California $43.8B AUM 42.28% 1-Year Est. Return

Mackenzie Financial Toronto Ontario, Ontario, Canada $83.3B AUM 31.19% 1-Year Est. Return

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

1832 Asset Management Toronto, Ontario, Canada $109B AUM 35.56% 1-Year Est. Return

William Blair Investment Management's WCN Position: Q3 2025 in Review

William Blair Investment Management sold out of Waste Connections (WCN) in Q3 2025, closing a stake of 339,466 shares — an estimated $63.4M sold.

William Blair Investment Management first reported a position in WCN in Q3 2018 and held it in 9 quarters. The position peaked at $63.4M in Q2 2025. 749 funds tracked by Wall St. Rank hold WCN as of Q3 2025.

William Blair Investment Management reported no remaining Waste Connections position as of Q3 2025 after selling out during the quarter.
William Blair Investment Management sold 339,466 Waste Connections shares in Q3 2025, an estimated $63.4M.
William Blair Investment Management first reported a position in Waste Connections in Q3 2018 and held it in 9 quarters.
William Blair Investment Management's Waste Connections position peaked at $63.4M in Q2 2025.
749 funds tracked by Wall St. Rank held Waste Connections as of Q3 2025.

Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.