Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
296 institutional managers reported holding STN for the quarter ended Mar 31, 2026. Together they hold about 60% of shares outstanding; the top 10 hold 29%. 39 opened new positions; 20 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 5.02M | 4.40% | $432.9M | added +0.8% | 2015 Q1 |
| Bank OF Montreal /CAN/ | 4.74M | 4.16% | $409.0M | added +6.2% | ≤2013 |
| 1832 Asset Management L.p. | 3.93M | 3.44% | $338.7M | trimmed -1.2% | ≤2013 |
| Royal Bank OF Canada | 3.76M | 3.30% | $324.2M | trimmed -9% | ≤2013 |
| Pictet Asset Management Holding SA | 3.49M | 3.06% | $300.5M | added +19% | 2018 Q3 |
| AllianceBernstein | 3.46M | 3.04% | $298.7M | trimmed -0.6% | 2021 Q1 |
| Mackenzie Financial CORP | 3.11M | 2.72% | $267.7M | trimmed -25.6% | 2017 Q2 |
| Fiera Capital CORP | 2.02M | 1.77% | $173.8M | added +1.8% | ≤2013 |
| FMR (Fidelity) | 1.90M | 1.67% | $164.1M | unchanged | ≤2013 |
| Morgan Stanley | 1.52M | 1.33% | $131.3M | added +11% | ≤2013 |
| Man Group | 1.52M | 1.33% | $131.1M | trimmed -3.7% | 2021 Q2 |
| Manufacturers Life Insurance Company, THE | 1.39M | 1.22% | $120.3M | trimmed -4.4% | 2015 Q2 |
| Goldman Sachs | 1.28M | 1.12% | $110.1M | trimmed -2.4% | ≤2013 |
| Bank OF America CORP /DE/ | 1.14M | 1.00% | $98.4M | added +12.6% | ≤2013 |
| Geode Capital | 1.12M | 0.98% | $96.5M | added +5.7% | 2018 Q4 |
| BCV Asset Management INC. | 1.03M | 0.90% | $88.8M | added +4.4% | 2025 Q4 |
| Principal Financial Group INC | 983.6k | 0.86% | $84.8M | added +5.5% | 2022 Q1 |
| Janus Henderson | 903.9k | 0.79% | $77.9M | unchanged | 2024 Q4 |
| National Bank OF Canada /FI/ | 875.7k | 0.77% | $75.5M | trimmed -3.3% | 2021 Q4 |
| Invesco | 842.2k | 0.74% | $72.6M | added +18.7% | ≤2013 |
| Legal & General Group PLC | 840.8k | 0.74% | $72.5M | trimmed -5.8% | 2015 Q1 |
| Allianz Asset Management GmbH | 827.8k | 0.73% | $71.4M | trimmed -10.1% | ≤2013 |
| Amundi | 825.6k | 0.72% | $71.2M | added +8.2% | 2021 Q3 |
| TD Asset Management INC | 801.2k | 0.70% | $69.1M | added +5.6% | ≤2013 |
| Two Sigma | 763.6k | 0.67% | $65.8M | added +33.9% | 2023 Q1 |
| TD Waterhouse Canada INC. | 744.4k | 0.65% | $64.2M | added +58.2% | 2021 Q4 |
| CPP Investment Board | 717.3k | 0.63% | $61.8M | added +49.9% | 2022 Q3 |
| First Trust Advisors LP | 696.3k | 0.61% | $60.0M | added +0.7% | 2021 Q3 |
| DekaBank Deutsche Girozentrale | 685.2k | 0.60% | $59.1M | unchanged | 2020 Q1 |
| Alberta Investment Management CORP | 668.6k | 0.59% | $57.7M | added +13.1% | 2025 Q4 |
| Millennium Management | 640.5k | 0.56% | $55.2M | added +209.3% | 2019 Q4 |
| AQR Capital | 629.2k | 0.55% | $54.3M | trimmed -6.1% | 2025 Q2 |
| Russell Investments Group, LTD. | 611.6k | 0.54% | $52.7M | added +11.8% | 2016 Q4 |
| Connor, Clark & Lunn Investment Management LTD. | 599.9k | 0.53% | $51.7M | trimmed -39.6% | ≤2013 |
| Toronto Dominion Bank | 550.2k | 0.48% | $47.4M | added +26% | ≤2013 |
| Federation des caisses Desjardins du Quebec | 546.1k | 0.48% | $47.1M | added +1.1% | 2017 Q1 |
| BlackRock | 515.6k | 0.45% | $44.5M | added +1.5% | 2021 Q1 |
| Dimensional Fund Advisors | 459.0k | 0.40% | $39.6M | added +23.9% | ≤2013 |
| Vontobel Holding LTD. | 433.0k | 0.38% | $37.3M | added +6.9% | 2021 Q1 |
| Swiss National Bank | 384.0k | 0.34% | $33.1M | added +27% | ≤2013 |
| Guardian Capital LP | 366.4k | 0.32% | $31.6M | added +24.3% | 2020 Q1 |
| Barclays PLC | 365.8k | 0.32% | $31.5M | added +2.5% | 2015 Q4 |
| Acadian Asset Management | 364.7k | 0.32% | $31.4M | added +105.3% | 2023 Q1 |
| Cibc World Market INC. | 364.0k | 0.32% | $31.4M | added +35.7% | ≤2013 |
| Clearbridge Investments, LLC | 308.3k | 0.27% | $26.6M | trimmed -3.3% | 2023 Q4 |
| UBS | 307.6k | 0.27% | $26.5M | trimmed -21.3% | ≤2013 |
| Citadel Advisors | 307.1k | 0.27% | $26.5M | added +111.9% | 2021 Q4 |
| D. E. Shaw | 304.6k | 0.27% | $26.3M | added +7.4% | 2021 Q4 |
| Charles Schwab Investment Management | 298.7k | 0.26% | $25.8M | added +3.6% | 2024 Q2 |
| Jupiter Asset Management LTD | 279.4k | 0.24% | $24.1M | unchanged | 2017 Q4 |
Largest 50 of 296 shown; the full ranked, searchable register is at boothcheck.com/holders/STN. 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.