ATS ATS Corporation
ATS Corporation (ATS) Institutional Ownership
What the institutions did with ATS last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| MASON CAPITAL MANAGEMENT LLC | 16.4M | 20.1% |
| ROYAL BANK OF CANADA | 7.9M | 9.7% |
| EdgePoint Investment Group Inc. | 7.0M | 8.6% |
| Beutel, Goodman & Co Ltd. | 4.8M | 5.9% |
| TURTLE CREEK ASSET MANAGEMENT INC. | 3.1M | 3.8% |
| BANK OF MONTREAL /CAN/ | 3.1M | 3.8% |
| FMR LLC | 2.9M | 3.6% |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | 2.5M | 3.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.4M | 2.9% |
| Jupiter Topco LLC | 2.3M | 2.8% |
| TD Waterhouse Canada Inc. | 1.7M | 2.1% |
| Hill City Capital, LP | 1.6M | 2.0% |
| ACK Asset Management LLC | 1.5M | 1.8% |
| FIL Ltd | 1.3M | 1.6% |
| Alberta Investment Management Corp | 1.2M | 1.4% |
| Scheer, Rowlett & Associates Investment Management Ltd. | 1.2M | 1.4% |
| BANK OF AMERICA CORP /DE/ | 1.1M | 1.4% |
| Connor, Clark & Lunn Investment Management Ltd. | 1.1M | 1.3% |
| NORGES BANK | 1.1M | 1.3% |
| Clearbridge Investments, LLC | 1.1M | 1.3% |
| Legal & General Group Plc | 1.1M | 1.3% |
| TD Asset Management Inc | 1.0M | 1.2% |
| Marathon Asset Management Ltd | 954.5K | 1.2% |
| NATIONAL BANK OF CANADA /FI/ | 855.3K | 1.0% |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | 795.6K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Vinva Investment Management Ltd | Sold Out | 2.1M | 0 | -2.1M |
| TURTLE CREEK ASSET MANAGEMENT INC. | Reduced | 4.9M | 3.1M | -1.8M |
| Connor, Clark & Lunn Investment Management Ltd. | Reduced | 2.3M | 1.1M | -1.2M |
| Beutel, Goodman & Co Ltd. | Reduced | 5.5M | 4.8M | -657.8K |
| FMR LLC | Increased | 2.3M | 2.9M | +628.0K |
| PRINCIPAL FINANCIAL GROUP INC | Sold Out | 620.8K | 0 | -620.8K |
| Langdon Equity Partners | New | 0 | 600.0K | +600.0K |
| FIL Ltd | Reduced | 1.8M | 1.3M | -451.3K |
| Legal & General Group Plc | Increased | 611.7K | 1.1M | +444.7K |
| TD Asset Management Inc | Reduced | 1.4M | 1.0M | -418.9K |
| ACK Asset Management LLC | Reduced | 1.8M | 1.5M | -346.2K |
| Invesco Ltd. | Reduced | 343.2K | 8.3K | -334.9K |
| Van Berkom & Associates Inc. | Reduced | 514.7K | 188.1K | -326.7K |
| TORONTO DOMINION BANK | Increased | 93.2K | 406.9K | +313.7K |
| Roubaix Capital, LLC | New | 0 | 246.9K | +246.9K |
| Alberta Investment Management Corp | Increased | 940.2K | 1.2M | +237.3K |
| FRANKLIN RESOURCES INC | Reduced | 247.5K | 25.4K | -222.1K |
| NATIONAL BANK OF CANADA /FI/ | Increased | 648.3K | 855.3K | +207.0K |
| ROYCE & ASSOCIATES LP | Sold Out | 179.5K | 0 | -179.5K |
| BANK OF AMERICA CORP /DE/ | Increased | 945.9K | 1.1M | +176.3K |
| GOLDMAN SACHS GROUP INC | Increased | 52.3K | 223.8K | +171.5K |
| EdgePoint Investment Group Inc. | Reduced | 7.2M | 7.0M | -163.5K |
| NewGen Asset Management Ltd | New | 0 | 150.0K | +150.0K |
| Marathon Asset Management Ltd | Reduced | 1.1M | 954.5K | -139.4K |
| Front Street Capital Management, Inc. | Reduced | 261.1K | 125.0K | -136.1K |
| MORGAN STANLEY | Increased | 100.4K | 234.2K | +133.8K |
| ROYAL BANK OF CANADA | Increased | 7.8M | 7.9M | +119.6K |
| JANE STREET GROUP, LLC | Increased | 82.6K | 199.6K | +117.0K |
| Waratah Capital Advisors Ltd. | Increased | 224.0K | 334.9K | +110.9K |
| ArrowMark Colorado Holdings LLC | Increased | 174.0K | 280.0K | +106.0K |
| Polar Asset Management Partners Inc. | New | 0 | 105.2K | +105.2K |
| K.J. Harrison & Partners Inc | New | 0 | 100.0K | +100.0K |
| MACKENZIE FINANCIAL CORP | Reduced | 616.5K | 524.8K | -91.7K |
| HALLSTATT ADVISORS L.P. | New | 0 | 83.0K | +83.0K |
| MONTRUSCO BOLTON INVESTMENTS INC. | Reduced | 171.0K | 99.1K | -71.9K |
| SEI INVESTMENTS CO | Reduced | 167.8K | 97.4K | -70.4K |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | Reduced | 863.5K | 795.6K | -67.9K |
| CenterBook Partners LP | New | 0 | 65.2K | +65.2K |
| BOOTHBAY FUND MANAGEMENT, LLC | New | 0 | 59.9K | +59.9K |
| Federation des caisses Desjardins du Quebec | Reduced | 113.0K | 54.9K | -58.1K |
| BANK OF MONTREAL /CAN/ | Reduced | 3.1M | 3.1M | -52.4K |
| TD Waterhouse Canada Inc. | Increased | 1.6M | 1.7M | +49.2K |
| 1832 Asset Management L.P. | Reduced | 401.7K | 355.7K | -46.0K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 122.5K | 167.1K | +44.7K |
| PCJ Investment Counsel Ltd. | Increased | 50.0K | 85.6K | +35.6K |
| XTX Topco Ltd | New | 0 | 35.0K | +35.0K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | 0 | 34.8K | +34.8K |
| AMERICAN CENTURY COMPANIES INC | New | 0 | 32.5K | +32.5K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 2.4M | 2.4M | +31.7K |
| BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp | Increased | 70.4K | 101.5K | +31.1K |
| Clearbridge Investments, LLC | Reduced | 1.1M | 1.1M | -30.8K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | Increased | 758.3K | 788.8K | +30.5K |
| D. E. Shaw & Co., Inc. | Sold Out | 30.2K | 0 | -30.2K |
| Verition Fund Management LLC | New | 0 | 29.5K | +29.5K |
| Numerai GP LLC | Sold Out | 27.5K | 0 | -27.5K |
| FIRST TRUST ADVISORS LP | Increased | 154.4K | 181.6K | +27.2K |
| LOUISBOURG INVESTMENTS INC. | Increased | 84.9K | 111.1K | +26.2K |
| Squarepoint Ops LLC | New | 0 | 24.8K | +24.8K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | Increased | 31.5K | 54.4K | +22.9K |
| Granite Investment Partners, LLC | Increased | 173.0K | 195.9K | +22.9K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.