13F reference period
Q2 2026
Security Snapshot
ATS Corp /ATS - Common Shares (ATS) Institutional Ownership
CUSIP: 00217Y104
13F Institutional Holders and Ownership History from Q4 2022 to Q3 2026
Institutions Reporting
141
Shares (Excl. Options)
81.6M
Full value: 81,596,752 · shares · 30 Jun 2026Price
$28.78
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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- Security type / class
- Equity / Common Shares
- Symbol
- ATS on NYSE
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 81,596,752
- Total 13F value
- $2,369,235,710
- Portfolio coverage rank
- 0%
- Share change
- -3,505,811
- Value change
- -$78,674,906
- Number of holders
- 141
- Shares outstanding
- 74,951,906
- SEC-reported price per share
- $17.62
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
Filing notes and source
Key facts
- ATS - ATS Corp /ATS - Common Shares is tracked under CUSIP 00217Y104.
- 141 institutions reported positions in Q2 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 131 to 141 between Q1 2026 and Q2 2026.
- SEC-reported value moved from to
$2.39B
Full value: $2,390,242,247 · USD · 31 Mar 2026.$2.37B
Full value: $2,369,235,710 · USD · 30 Jun 2026
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 141 institutions filings for Q2 2026.
Security key
00217Y104
13F reference period
Q2 2026
13F holders
141
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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| Beutel, Goodman & Co Ltd. | 6.4% | +30% | $92,100,902 | 4,796,922 | 0% | Beutel, Goodman & Co Ltd. | 31 Aug 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 30 Jun 2026,
141
institutional investors reported holding
shares of
ATS Corp /ATS - Common Shares (ATS).
This represents
109%
of the company’s total
outstanding shares.
81.6M
Full value: 81,596,752 · shares · 30 Jun 202674.95M
Full value: 74,951,906 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
93%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| MASON CAPITAL MANAGEMENT LLC | 22% | 16,404,170 | 0% | 78% | $472,112,013 |
| ROYAL BANK OF CANADA | 11% | 7,881,423 | +1.5% | 0.04% | $226,828,000 |
| EdgePoint Investment Group Inc. | 9.3% | 7,004,577 | -2.3% | 1.5% | $201,699,483 |
| Beutel, Goodman & Co Ltd. | 6.4% | 4,796,922 | -12% | 1% | $138,218,000 |
| TURTLE CREEK ASSET MANAGEMENT INC. | 4.1% | 3,084,567 | -37% | 3.5% | $88,773,838 |
| BANK OF MONTREAL /CAN/ | 4.1% | 3,062,973 | -1.7% | 0.03% | $88,199,482 |
| FMR LLC | 3.9% | 2,905,456 | +28% | 0% | $83,747,606 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN | 3.3% | 2,486,400 | 0% | 2.7% | $70,487,018 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.2% | 2,398,431 | +1.3% | 0% | $69,132,375 |
| Jupiter Topco LLC | 3.1% | 2,322,073 | 0% | 0.03% | $66,907,877 |
| TD Waterhouse Canada Inc. | 2.2% | 1,683,683 | +3% | 0.12% | $47,430,639 |
| Hill City Capital, LP | 2.2% | 1,649,857 | 0% | 1.1% | $47,482,884 |
| ACK Asset Management LLC | 2% | 1,500,000 | -19% | 5% | $43,170,000 |
| FIL Ltd | 1.8% | 1,326,851 | -25% | 0.03% | $38,235,591 |
| Alberta Investment Management Corp | 1.6% | 1,177,491 | +25% | 0.2% | $33,903,767 |
| Scheer, Rowlett & Associates Investment Management Ltd. | 1.6% | 1,175,268 | -0.56% | 2.4% | $33,842,293 |
| BANK OF AMERICA CORP /DE/ | 1.5% | 1,122,152 | +19% | 0% | $32,295,534 |
| Connor, Clark & Lunn Investment Management Ltd. | 1.5% | 1,089,460 | -52% | 0.06% | $31,371,419 |
| NORGES BANK | 1.4% | 1,084,181 | 0% | $31,219,408 | |
| Clearbridge Investments, LLC | 1.4% | 1,060,487 | -2.8% | 0.03% | $30,520,820 |
| Legal & General Group Plc | 1.4% | 1,056,408 | +73% | 0.01% | $30,403,319 |
| TD Asset Management Inc | 1.3% | 1,003,596 | -29% | 0.03% | $28,917,712 |
| Marathon Asset Management Ltd | 1.3% | 954,485 | -13% | 1.1% | $27,500,179 |
| NATIONAL BANK OF CANADA /FI/ | 1.1% | 855,316 | +32% | 0.02% | $24,208,177 |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | 1.1% | 795,619 | -7.9% | 0.25% | $32,524,905 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
16
Headline period
Q2 2026
Rows shown
1-16 of 16
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 4,192,472 | $76,719,143 | -$18,910,702 | $18.05 | 22 |
| 2026 Q2 | 81,596,752 | $2,369,235,710 | -$78,674,906 | $28.78 | 141 |
| 2026 Q1 | 85,077,591 | $2,390,242,247 | +$32,530,652 | $28.19 | 131 |
| 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 |