| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Turtle Creek Asset Management Inc. | 7.8% | -16% | $222,099,142 | -$38,498,289 | 7,590,538 | -15% | Turtle Creek Asset Management Inc. | 30 Jun 2025 |
| Beutel, Goodman & Co Ltd. | 6.7% | $164,195,186 | 6,515,682 | Beutel, Goodman & Co Ltd. | 31 Dec 2024 | |||
| EdgePoint Investment Group Inc. | 6.6% | +29% | $188,258,986 | +$41,432,423 | 6,434,005 | +28% | EdgePoint Investment Group Inc. | 30 Jun 2025 |
| ROYAL BANK OF CANADA | 5.3% | $134,813,518 | 5,152,319 | Royal Bank of Canada | 31 Mar 2025 | |||
| BANK OF NOVA SCOTIA | 1.5% | -77% | $45,991,935 | -$119,696,952 | 1,443,772 | -72% | BANK OF NOVA SCOTIA | 30 Jun 2025 |
As of 30 Sep 2025, 114 institutional investors reported holding 82,609,227 shares of ATS Corp /ATS - Common Stock (ATS). This represents 84% of the company’s total 97,952,833 outstanding shares.
The largest institutional shareholders of ATS Corp /ATS - Common Stock (ATS) together control 73% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| MASON CAPITAL MANAGEMENT LLC | 16% | 15,563,568 | 0% | 83% | $407,765,482 |
| ROYAL BANK OF CANADA | 7.4% | 7,201,778 | +1.8% | 0.03% | $188,686,000 |
| TURTLE CREEK ASSET MANAGEMENT INC. | 7.1% | 6,973,010 | -8.1% | 5.5% | $182,692,862 |
| EdgePoint Investment Group Inc. | 6.5% | 6,381,294 | -0.82% | 1.2% | $166,911,934 |
| Beutel, Goodman & Co Ltd. | 6.5% | 6,330,688 | -7.4% | 1% | $165,660,000 |
| VANGUARD GROUP INC | 3.4% | 3,341,435 | +2.1% | 0% | $87,418,622 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | 2.5% | 2,486,400 | 0% | 3.1% | $64,134,644 |
| Connor, Clark & Lunn Investment Management Ltd. | 2.1% | 2,053,472 | -13% | 0.17% | $53,711,517 |
| ACK Asset Management LLC | 1.9% | 1,846,196 | 0% | 6.1% | $48,370,335 |
| Burgundy Asset Management Ltd. | 1.8% | 1,807,557 | -0.25% | 0.47% | $50,009,958 |
| Hill City Capital, LP | 1.7% | 1,649,857 | +35% | 1.8% | $43,226,253 |
| TD Waterhouse Canada Inc. | 1.5% | 1,430,232 | -1.5% | 0.24% | $37,353,928 |
| FMR LLC | 1.4% | 1,375,587 | -2.1% | 0% | $35,988,447 |
| BANK OF AMERICA CORP /DE/ | 1.3% | 1,251,695 | +45% | 0% | $32,794,409 |
| Scheer, Rowlett & Associates Investment Management Ltd. | 1.2% | 1,217,184 | +54% | 1.9% | $31,837,200 |
| Invesco Ltd. | 1.2% | 1,196,732 | +0.72% | 0% | $31,354,378 |
| TD Asset Management Inc | 1.2% | 1,181,762 | -7.6% | 0.03% | $30,924,217 |
| Marathon Asset Management Ltd | 1.2% | 1,166,007 | -5.6% | 1.1% | $30,509,231 |
| BANK OF MONTREAL /CAN/ | 1.2% | 1,142,653 | +4% | 0.01% | $29,887,734 |
| MACKENZIE FINANCIAL CORP | 1.2% | 1,138,559 | -19% | 0.04% | $29,780,843 |
| Clearbridge Investments, LLC | 1.2% | 1,130,381 | -39% | 0.02% | $29,615,980 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.1% | 1,109,230 | -0.34% | 0.05% | $29,026,207 |
| JANUS HENDERSON GROUP PLC | 0.92% | 898,343 | -2.6% | 0.01% | $23,507,395 |
| PRINCIPAL FINANCIAL GROUP INC | 0.89% | 874,140 | +12% | 0.01% | $22,874,398 |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | 0.83% | 815,678 | +262% | 0.27% | $29,698,836 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 308,470 | $8,505,561 | -$118,704 | $27.54 | 4 |
| 2025 Q3 | 82,609,227 | $2,172,834,640 | -$101,353,114 | $26.20 | 114 |
| 2025 Q2 | 86,037,688 | $2,745,033,167 | +$9,502,607 | $31.88 | 129 |
| 2025 Q1 | 86,213,629 | $2,148,649,459 | -$142,465 | $24.93 | 119 |
| 2024 Q4 | 85,210,516 | $2,593,234,883 | +$145,810,781 | $30.48 | 123 |
| 2024 Q3 | 80,425,623 | $2,336,166,828 | -$59,033,851 | $29.05 | 126 |
| 2024 Q2 | 81,527,969 | $2,634,583,338 | +$86,278,277 | $32.33 | 130 |
| 2024 Q1 | 59,644,626 | $2,014,103,458 | +$115,660,351 | $33.68 | 131 |
| 2023 Q4 | 74,333,688 | $3,204,670,256 | +$39,296,602 | $43.10 | 129 |
| 2023 Q3 | 73,394,963 | $3,126,158,632 | -$82,218,748 | $42.63 | 122 |
| 2023 Q2 | 74,501,364 | $3,430,975,795 | +$3,342,339,543 | $46.06 | 121 |
| 2023 Q1 | 1,924,252 | $80,570,894 | $41.87 | 2 | |
| 2022 Q4 | 1,075,000 | $33,420,000 | +$33,420,000 | $31.09 | 1 |