Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
776 institutional managers reported holding WCN for the quarter ended Mar 31, 2026. Together they hold about 83% of shares outstanding; the top 10 hold 37%. 88 opened new positions; 107 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 31.07M | 12.14% | $5.05B | unchanged | ≤2013 |
| Royal Bank OF Canada | 12.21M | 4.77% | $1.98B | added +1.4% | ≤2013 |
| FMR (Fidelity) | 8.96M | 3.50% | $1.46B | trimmed -12.7% | 2016 Q1 |
| Bank OF Montreal /CAN/ | 8.14M | 3.18% | $1.32B | trimmed -5.5% | ≤2013 |
| 1832 Asset Management L.p. | 7.11M | 2.78% | $1.16B | added +25.9% | 2016 Q2 |
| BlackRock | 6.19M | 2.42% | $1.01B | added +4.4% | ≤2013 |
| Capital International Investors | 5.23M | 2.04% | $849.2M | trimmed -19.2% | 2014 Q3 |
| Mackenzie Financial CORP | 4.98M | 1.95% | $809.0M | trimmed -11.4% | ≤2013 |
| Wellington Management | 4.94M | 1.93% | $801.7M | added +5.6% | ≤2013 |
| Goldman Sachs | 4.71M | 1.84% | $765.7M | added +62.5% | ≤2013 |
| TD Asset Management INC | 4.03M | 1.57% | $654.7M | added +4.8% | ≤2013 |
| WCM Investment Management | 3.88M | 1.51% | $629.5M | trimmed -38.4% | 2022 Q2 |
| Manufacturers Life Insurance Company, THE | 3.72M | 1.46% | $605.0M | added +48.7% | ≤2013 |
| Two Sigma | 3.44M | 1.35% | $559.5M | added +219.1% | 2023 Q4 |
| Citadel Advisors | 3.11M | 1.22% | $505.8M | added +200.9% | 2013 Q3 |
| T. Rowe Price | 2.82M | 1.10% | $457.6M | added +5.5% | ≤2013 |
| Bank OF America CORP /DE/ | 2.67M | 1.04% | $433.6M | trimmed -20.8% | ≤2013 |
| Morgan Stanley | 2.58M | 1.01% | $418.6M | trimmed -15.3% | ≤2013 |
| Fiera Capital CORP | 2.55M | 0.99% | $413.7M | trimmed -7.9% | 2016 Q1 |
| Stockbridge Partners LLC (focused) | 2.45M | 0.96% | $398.2M | added +3.5% | 2023 Q4 |
| Pictet Asset Management Holding SA | 2.33M | 0.91% | $377.7M | trimmed -33.7% | ≤2013 |
| UBS | 2.14M | 0.84% | $347.8M | added +181.1% | ≤2013 |
| Impax Asset Management Group plc | 2.12M | 0.83% | $344.0M | added +339.6% | 2024 Q3 |
| Cibc World Market INC. | 2.05M | 0.80% | $332.7M | unchanged | 2016 Q2 |
| Gates Foundation Trust (focused) | 2.04M | 0.80% | $331.2M | unchanged | 2022 Q3 |
| National Bank OF Canada /FI/ | 2.00M | 0.78% | $324.6M | trimmed -4.1% | 2021 Q4 |
| State Street | 1.97M | 0.77% | $319.4M | added +3.1% | ≤2013 |
| Montrusco Bolton Investments INC. | 1.82M | 0.71% | $296.0M | trimmed -22.3% | 2021 Q3 |
| Brown Advisory INC | 1.70M | 0.67% | $276.2M | added +1.3% | ≤2013 |
| Connor, Clark & Lunn Investment Management LTD. | 1.67M | 0.65% | $271.8M | added +26% | 2016 Q2 |
| CPP Investment Board | 1.61M | 0.63% | $261.7M | added +2.4% | 2021 Q4 |
| Principal Financial Group INC | 1.50M | 0.59% | $243.5M | trimmed -17.7% | ≤2013 |
| Deutsche Bank AG\ | 1.40M | 0.55% | $227.6M | added +5% | ≤2013 |
| Neuberger Berman Group LLC | 1.37M | 0.53% | $222.1M | added +14.4% | ≤2013 |
| Legal & General Group PLC | 1.24M | 0.48% | $201.8M | trimmed -3.6% | ≤2013 |
| Arrowstreet Capital | 1.20M | 0.47% | $195.1M | added +70.8% | 2024 Q3 |
| Public Employees Retirement Association OF Colorado | 1.11M | 0.43% | $181.0M | trimmed -8.6% | ≤2013 |
| AQR Capital | 1.11M | 0.43% | $180.1M | added +43% | ≤2013 |
| King Luther Capital Management CORP | 1.05M | 0.41% | $171.2M | trimmed -6% | ≤2013 |
| Nomura Asset Management International INC. | 1.02M | 0.40% | $165.2M | trimmed -6.4% | 2024 Q4 |
| Cibc Asset Management INC | 972.1k | 0.38% | $157.9M | trimmed -50.5% | 2015 Q4 |
| Skye Global Management LP (focused) | 932.0k | 0.36% | $151.4M | added +4.5% | 2022 Q3 |
| Raymond James Financial INC | 872.0k | 0.34% | $141.7M | trimmed -18.7% | ≤2013 |
| Snyder Capital Management L P | 859.8k | 0.34% | $139.7M | added +9% | ≤2013 |
| DF Dent & CO INC | 859.5k | 0.34% | $139.6M | trimmed -17.4% | ≤2013 |
| Northern Trust | 850.2k | 0.33% | $138.1M | unchanged | ≤2013 |
| Millennium Management | 839.4k | 0.33% | $136.3M | added +357.2% | ≤2013 |
| TD Waterhouse Canada INC. | 833.4k | 0.33% | $135.4M | added +128.5% | 2021 Q4 |
| Federation des caisses Desjardins du Quebec | 829.3k | 0.32% | $134.7M | added +9.7% | 2017 Q1 |
| Geode Capital | 780.3k | 0.30% | $126.8M | trimmed -10.7% | ≤2013 |
Largest 50 of 776 shown; the full ranked, searchable register is at boothcheck.com/holders/WCN. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.