| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Beutel, Goodman & Co Ltd. | 6.7% | $164,195,186 | 6,515,682 | Beutel, Goodman & Co Ltd. | 31 Dec 2024 | |||
| ROYAL BANK OF CANADA | 6.6% | +27% | $191,879,248 | +$39,473,652 | 6,486,790 | +26% | Royal Bank of Canada | 31 Dec 2025 |
| EdgePoint Investment Group Inc. | 6.6% | +29% | $188,258,986 | +$41,432,423 | 6,434,005 | +28% | EdgePoint Investment Group Inc. | 30 Jun 2025 |
| Turtle Creek Asset Management Inc. | 5.8% | -25% | $166,891,898 | -$57,636,216 | 5,642,052 | -26% | Turtle Creek Asset Management Inc. | 31 Dec 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 31 Dec 2025, 120 institutional investors reported holding 82,982,898 shares of ATS Corp /ATS - Common Shares (ATS). This represents 85% of the company’s total 97,276,759 outstanding shares.
The largest institutional shareholders of ATS Corp /ATS - Common Shares (ATS) together control 75% 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% | 76% | $428,620,663 |
| ROYAL BANK OF CANADA | 7.9% | 7,644,547 | +6.1% | 0.04% | $210,529,000 |
| EdgePoint Investment Group Inc. | 7.1% | 6,888,785 | +8% | 1.6% | $189,771,064 |
| Beutel, Goodman & Co Ltd. | 6% | 5,837,138 | -7.8% | 0.99% | $161,008,000 |
| TURTLE CREEK ASSET MANAGEMENT INC. | 5.8% | 5,642,052 | -19% | 6.8% | $155,382,112 |
| VANGUARD GROUP INC | 3.5% | 3,397,166 | +1.7% | 0% | $93,581,732 |
| BANK OF MONTREAL /CAN/ | 3.1% | 3,022,693 | +165% | 0.03% | $83,268,626 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | 2.6% | 2,486,400 | 0% | 3.3% | $68,282,019 |
| Connor, Clark & Lunn Investment Management Ltd. | 2.6% | 2,485,638 | +21% | 0.18% | $68,473,928 |
| FMR LLC | 2.2% | 2,117,766 | +54% | 0% | $58,338,663 |
| ACK Asset Management LLC | 1.9% | 1,846,196 | 0% | 6.4% | $50,844,238 |
| Hill City Capital, LP | 1.7% | 1,649,857 | 0% | 1.7% | $45,437,062 |
| Alberta Investment Management Corp | 1.4% | 1,340,265 | 0% | 0.22% | $36,918,085 |
| Invesco Ltd. | 1.3% | 1,272,222 | +6.3% | 0.01% | $35,036,994 |
| Scheer, Rowlett & Associates Investment Management Ltd. | 1.3% | 1,226,450 | +0.76% | 2.3% | $33,786,034 |
| TD Asset Management Inc | 1.2% | 1,193,208 | +0.97% | 0.03% | $32,912,781 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.2% | 1,141,835 | +2.9% | 0.05% | $31,495,737 |
| Clearbridge Investments, LLC | 1.1% | 1,111,485 | -1.7% | 0.02% | $30,610,300 |
| BANK OF AMERICA CORP /DE/ | 1.1% | 1,100,381 | -12% | 0% | $30,304,491 |
| Marathon Asset Management Ltd | 1.1% | 1,097,711 | -5.9% | 1.2% | $30,277,826 |
| NORGES BANK | 1.1% | 1,079,090 | 0% | $29,726,586 | |
| TD Waterhouse Canada Inc. | 0.99% | 966,349 | -32% | 0.16% | $26,496,242 |
| PRINCIPAL FINANCIAL GROUP INC | 0.9% | 878,240 | +0.47% | 0.01% | $24,224,881 |
| JANUS HENDERSON GROUP PLC | 0.89% | 861,839 | -4.1% | 0.01% | $23,772,187 |
| 1832 Asset Management L.P. | 0.84% | 818,559 | +11% | 0.03% | $22,543,115 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 82,982,898 | $2,294,274,231 | +$56,886,367 | $27.55 | 120 |
| 2025 Q3 | 83,527,331 | $2,196,849,014 | -$97,517,298 | $26.20 | 115 |
| 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 |