Latest Period
Q1 2026
Security Snapshot
ATS Corp /ATS - Common Shares (ATS) Institutional Ownership
CUSIP: 00217Y104
13F Institutional Holders and Ownership History from Q4 2022 to Q1 2026
Institutions Reporting
129
Shares (Excl. Options)
84,923,386
Price
$28.19
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- Security type / class
- Equity / Common Shares
- Symbol
- ATS on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 84,923,386
- Total 13F value
- $2,385,904,163
- Portfolio coverage rank
- 0.01%
- Share change
- +1,868,921
- Value change
- +$32,497,694
- Number of holders
- 129
- Shares outstanding
- 98,129,639
- SEC-reported price per share
- $34.04
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ATS - ATS Corp /ATS - Common Shares is tracked under CUSIP 00217Y104.
- 129 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 121 to 129 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $2,295,067,617 to $2,385,904,163.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 129 institutions filings for Q1 2026.
Security key
00217Y104
Latest holder period
Q1 2026
13F holders
129
13D/G owners
5
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 00217Y104:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
ATS
| 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% | -14% | $154,440,940 | -$23,509,380 | 4,896,669 | -13% | Turtle Creek Asset Management Inc. | 31 Mar 2026 |
| 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 Mar 2026, 129 institutional investors reported holding 84,923,386 shares of ATS Corp /ATS - Common Shares (ATS). This represents 87% of the company’s total 98,129,639 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
76%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| MASON CAPITAL MANAGEMENT LLC | 17% | 16,404,170 | +5.4% | 75% | $462,597,594 |
| ROYAL BANK OF CANADA | 7.9% | 7,761,838 | +1.5% | 0.04% | $218,884,000 |
| EdgePoint Investment Group Inc. | 7.3% | 7,168,112 | +4.1% | 1.6% | $202,081,247 |
| Beutel, Goodman & Co Ltd. | 5.6% | 5,454,749 | -6.6% | 1% | $153,259,000 |
| TURTLE CREEK ASSET MANAGEMENT INC. | 5% | 4,896,669 | -13% | 5.2% | $138,086,066 |
| BANK OF MONTREAL /CAN/ | 3.2% | 3,115,360 | +3.1% | 0.04% | $87,827,288 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | 2.5% | 2,486,400 | 0% | 3.6% | $69,352,987 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.4% | 2,366,730 | 0% | 0% | $66,708,652 |
| JANUS HENDERSON GROUP PLC | 2.3% | 2,297,214 | +167% | 0.03% | $64,543,983 |
| FMR LLC | 2.3% | 2,277,472 | +7.5% | 0% | $64,193,571 |
| Connor, Clark & Lunn Investment Management Ltd. | 2.3% | 2,264,757 | -8.9% | 0.15% | $63,847,345 |
| Vinva Investment Management Ltd | 2.1% | 2,088,947 | 0.46% | $36,514,794 | |
| ACK Asset Management LLC | 1.9% | 1,846,196 | 0% | 6.5% | $52,062,727 |
| FIL Ltd | 1.8% | 1,778,181 | +3219% | 0.04% | $50,088,280 |
| Hill City Capital, LP | 1.7% | 1,649,857 | 0% | 1.7% | $46,525,967 |
| TD Waterhouse Canada Inc. | 1.7% | 1,634,449 | +69% | 0.14% | $46,872,536 |
| TD Asset Management Inc | 1.4% | 1,422,459 | +19% | 0.03% | $39,966,047 |
| Scheer, Rowlett & Associates Investment Management Ltd. | 1.2% | 1,181,937 | -3.6% | 2.4% | $33,320,811 |
| Marathon Asset Management Ltd | 1.1% | 1,093,911 | -0.35% | 1.2% | $30,733,509 |
| Clearbridge Investments, LLC | 1.1% | 1,091,291 | -1.8% | 0.03% | $30,774,410 |
| BANK OF AMERICA CORP /DE/ | 0.96% | 945,875 | -14% | 0% | $26,673,675 |
| Alberta Investment Management Corp | 0.96% | 940,191 | -30% | 0.16% | $26,505,581 |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | 0.88% | 863,486 | +5.9% | 0.3% | $33,857,286 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.77% | 758,313 | -34% | 0.03% | $21,305,903 |
| VANGUARD FIDUCIARY TRUST CO | 0.74% | 728,058 | 0% | 0.01% | $20,521,043 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
14
Latest
Q1 2026
Rows shown
1-14 of 14
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 84,923,386 | $2,385,904,163 | +$32,497,694 | $28.19 | 129 |
| 2025 Q4 | 83,011,700 | $2,295,067,617 | +$56,882,620 | $27.55 | 121 |
| 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 |