ATS Corp /ATS - ATS

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q3 2026 · Compare: Q2 2026
13D/13G major owners: Ownership tab.
Methodology: Market value and % of portfolio use SEC reported VALUE ($000). For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received. Details.
Rows: 0
Investor History Status Shares held Market value ($000) % of portfolio Previous % Rank Change in shares % change in shares Source Date reported
MASON CAPITAL MANAGEMENT LLC History No change 16,404,170 472,112 77.78% 77.78% 1 0 0.0% Q2 2026 Aug 14, 2026
ROYAL BANK OF CANADA History No change 7,881,423 226,828 0.03% 0.03% 2 0 0.0% Q2 2026 Aug 14, 2026
EdgePoint Investment Group Inc. History No change 7,004,577 201,699 1.52% 1.52% 3 0 0.0% Q2 2026 Aug 14, 2026
Beutel, Goodman & Co Ltd. History No change 4,796,922 138,218 1.02% 1.02% 4 0 0.0% Q2 2026 Aug 12, 2026
Turtle Creek Asset Management Inc. History No change 3,084,567 88,773 3.47% 3.47% 5 0 0.0% Q2 2026 Aug 14, 2026
BANK OF MONTREAL /CAN/ History No change 3,062,973 88,199 0.03% 0.03% 6 0 0.0% Q2 2026 Aug 12, 2026
FMR LLC History No change 2,905,456 83,747 0.0% 0.0% 7 0 0.0% Q2 2026 Aug 13, 2026
FAIRFAX FINANCIAL HOLDINGS LTD/ CAN History No change 2,486,400 70,487 2.67% 2.67% 8 0 0.0% Q2 2026 Aug 14, 2026
VANGUARD CAPITAL MANAGEMENT LLC History No change 2,398,431 69,132 0.0% 0.0% 9 0 0.0% Q2 2026 Aug 13, 2026
Jupiter Topco LLC History No change 2,322,073 66,907 0.03% 0.03% 10 0 0.0% Q2 2026 Aug 14, 2026
Hill City Capital, LP History No change 1,649,857 47,482 1.11% 1.11% 11 0 0.0% Q2 2026 Aug 17, 2026
TD Waterhouse Canada Inc. History No change 1,683,683 47,430 0.12% 0.12% 12 0 0.0% Q2 2026 Jul 27, 2026
ACK Asset Management LLC History No change 1,500,000 43,170 5.04% 5.04% 13 0 0.0% Q2 2026 Aug 13, 2026
FIL Ltd History No change 1,326,851 38,235 0.03% 0.03% 14 0 0.0% Q2 2026 Aug 13, 2026
Alberta Investment Management Corp History No change 1,177,491 33,903 0.19% 0.19% 15 0 0.0% Q2 2026 Aug 06, 2026
Scheer, Rowlett & Associates Investment Management Ltd. History No change 1,175,268 33,842 2.43% 2.43% 16 0 0.0% Q2 2026 Aug 12, 2026
VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. History No change 795,619 32,524 0.25% 0.25% 17 0 0.0% Q2 2026 Aug 14, 2026
BANK OF AMERICA CORP /DE/ History No change 1,122,152 32,295 0.0% 0.0% 18 0 0.0% Q2 2026 Aug 14, 2026
Connor, Clark & Lunn Investment Management Ltd. History No change 1,089,460 31,371 0.06% 0.06% 19 0 0.0% Q2 2026 Aug 12, 2026
NORGES BANK History No change 1,084,181 31,219 0.0% 0.0% 20 0 0.0% Q2 2026 Aug 12, 2026
Clearbridge Investments, LLC History No change 1,060,487 30,520 0.03% 0.03% 21 0 0.0% Q2 2026 Aug 13, 2026
Legal & General Group Plc History No change 1,056,408 30,403 0.01% 0.01% 22 0 0.0% Q2 2026 Aug 14, 2026
TD ASSET MANAGEMENT INC History No change 1,003,596 28,917 0.03% 0.03% 23 0 0.0% Q2 2026 Aug 04, 2026
Marathon Asset Management Ltd History No change 954,485 27,500 1.12% 1.12% 24 0 0.0% Q2 2026 Aug 14, 2026
NATIONAL BANK OF CANADA /FI/ History No change 855,316 24,208 0.02% 0.02% 25 0 0.0% Q2 2026 Aug 10, 2026
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. History No change 788,784 22,728 0.03% 0.03% 26 0 0.0% Q2 2026 Aug 14, 2026
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ History No change 540,733 22,105 0.01% 0.01% 27 0 0.0% Q2 2026 Aug 03, 2026
MACKENZIE FINANCIAL CORP History No change 524,774 21,452 0.02% 0.02% 28 0 0.0% Q2 2026 Aug 13, 2026
VANGUARD FIDUCIARY TRUST CO History No change 724,271 20,876 0.0% 0.0% 29 0 0.0% Q2 2026 Aug 13, 2026
Langdon Equity Partners History No change 600,000 17,286 9.66% 9.66% 30 0 0.0% Q2 2026 Aug 13, 2026
TORONTO DOMINION BANK History No change 480,616 13,839 0.02% 0.02% 31 0 0.0% Q2 2026 Aug 14, 2026
PUBLIC SECTOR PENSION INVESTMENT BOARD History No change 378,001 10,884 0.03% 0.03% 32 0 0.0% Q2 2026 Aug 13, 2026
1832 Asset Management L.P. History No change 355,745 10,238 0.01% 0.01% 33 0 0.0% Q2 2026 Aug 13, 2026
Waratah Capital Advisors Ltd. History No change 334,923 9,639 0.33% 0.33% 34 0 0.0% Q2 2026 Aug 11, 2026
CIBC WORLD MARKET INC. History No change 327,087 9,419 0.02% 0.02% 35 0 0.0% Q2 2026 Aug 13, 2026
ArrowMark Colorado Holdings LLC History No change 280,000 8,058 0.34% 0.34% 36 0 0.0% Q2 2026 Aug 13, 2026
Vanguard Global Advisers, LLC History No change 274,103 7,900 0.0% 0.0% 37 0 0.0% Q2 2026 Aug 13, 2026
Roubaix Capital, LLC History No change 246,909 7,106 2.55% 2.55% 38 0 0.0% Q2 2026 Aug 10, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC History No change 243,525 7,016 0.0% 0.0% 39 0 0.0% Q2 2026 Aug 14, 2026
MORGAN STANLEY History No change 234,236 6,741 0.0% 0.0% 40 0 0.0% Q2 2026 Aug 13, 2026
GOLDMAN SACHS GROUP INC History No change 223,762 6,439 0.0% 0.0% 41 0 0.0% Q2 2026 Aug 14, 2026
UBS Group AG History No change 222,553 6,405 0.0% 0.0% 42 0 0.0% Q2 2026 Aug 13, 2026
Dixon Mitchell Investment Counsel Inc. History No change 211,025 6,080 0.2% 0.2% 43 0 0.0% Q2 2026 Aug 13, 2026
SIG North Trading, ULC History No change 210,675 6,063 0.11% 0.11% 44 0 0.0% Q2 2026 Aug 14, 2026
SCOTIA CAPITAL INC. History No change 212,719 6,021 0.02% 0.02% 45 0 0.0% Q2 2026 Aug 11, 2026
JANE STREET GROUP, LLC History No change 199,635 5,748 0.0% 0.0% 46 0 0.0% Q2 2026 Aug 14, 2026
Granite Investment Partners, LLC History No change 195,894 5,637 0.29% 0.29% 47 0 0.0% Q2 2026 Aug 07, 2026
Van Berkom & Associates Inc. History No change 188,066 5,410 0.17% 0.17% 48 0 0.0% Q2 2026 Aug 05, 2026
Focus Partners Wealth History No change 181,975 5,237 0.01% 0.01% 49 0 0.0% Q2 2026 Aug 12, 2026
FIRST TRUST ADVISORS LP History No change 181,592 5,234 0.0% 0.0% 50 0 0.0% Q2 2026 Aug 11, 2026
Swiss National Bank History No change 168,000 4,828 0.0% 0.0% 51 0 0.0% Q2 2026 Aug 11, 2026
DIMENSIONAL FUND ADVISORS LP History No change 167,149 4,808 0.0% 0.0% 52 0 0.0% Q2 2026 Aug 11, 2026
Candelo Capital Management LP History No change 165,100 4,758 2.93% 2.93% 53 0 0.0% Q2 2026 Aug 14, 2026
Delaney Capital Management Ltd. History No change 160,392 4,614 0.73% 0.73% 54 0 0.0% Q2 2026 Aug 14, 2026
NewGen Asset Management Ltd History No change 150,000 4,317 1.78% 1.78% 55 0 0.0% Q2 2026 Aug 13, 2026
CIBC Asset Management Inc History No change 138,246 3,976 0.01% 0.01% 56 0 0.0% Q2 2026 Aug 03, 2026
Front Street Capital Management, Inc. History No change 124,973 3,596 0.41% 0.41% 57 0 0.0% Q2 2026 Aug 13, 2026
HARBOR CAPITAL ADVISORS, INC. History No change 115,198 3,315 0.23% 0.23% 58 0 0.0% Q2 2026 Aug 07, 2026
LOUISBOURG INVESTMENTS INC. History No change 111,104 3,196 0.59% 0.59% 59 0 0.0% Q2 2026 Jul 22, 2026
Polar Asset Management Partners Inc. History No change 105,203 3,027 0.05% 0.05% 60 0 0.0% Q2 2026 Aug 14, 2026
BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp History No change 101,546 2,924 0.02% 0.02% 61 0 0.0% Q2 2026 Aug 13, 2026
K.J. Harrison & Partners Inc History No change 100,000 2,876 0.41% 0.41% 62 0 0.0% Q2 2026 Aug 07, 2026
MONTRUSCO BOLTON INVESTMENTS INC. History No change 99,056 2,854 0.04% 0.04% 63 0 0.0% Q2 2026 Jul 21, 2026
SEI INVESTMENTS CO History No change 97,376 2,802 0.0% 0.0% 64 0 0.0% Q2 2026 Aug 14, 2026
PCJ Investment Counsel Ltd. History No change 85,640 2,466 0.71% 0.71% 65 0 0.0% Q2 2026 Aug 12, 2026
LAZARD ASSET MANAGEMENT LLC History No change 83,052 2,390 0.0% 0.0% 66 0 0.0% Q2 2026 Aug 14, 2026
Canoe Financial LP History No change 83,024 2,390 0.03% 0.03% 67 0 0.0% Q2 2026 Jul 16, 2026
HALLSTATT ADVISORS L.P. History No change 83,020 2,390 1.68% 1.68% 68 0 0.0% Q2 2026 Aug 03, 2026
CITADEL ADVISORS LLC History No change 82,308 2,368 0.0% 0.0% 69 0 0.0% Q2 2026 Sep 02, 2026
MANUFACTURERS LIFE INSURANCE COMPANY, THE History No change 73,654 2,118 0.0% 0.0% 70 0 0.0% Q2 2026 Sep 09, 2026
GEODE CAPITAL MANAGEMENT, LLC History No change 69,598 2,044 0.0% 0.0% 71 0 0.0% Q2 2026 Aug 12, 2026
VANGUARD ASSET MANAGEMENT, Ltd History No change 66,830 1,926 0.0% 0.0% 72 0 0.0% Q2 2026 Aug 13, 2026
CenterBook Partners LP History No change 65,180 1,875 0.09% 0.09% 73 0 0.0% Q2 2026 Aug 11, 2026
Nuveen, LLC History No change 62,584 1,803 0.0% 0.0% 74 0 0.0% Q2 2026 Aug 11, 2026
Caldwell Investment Management Ltd. History No change 60,800 1,749 1.15% 1.15% 75 0 0.0% Q2 2026 Aug 11, 2026
BOOTHBAY FUND MANAGEMENT, LLC History No change 59,867 1,723 0.02% 0.02% 76 0 0.0% Q2 2026 Aug 14, 2026
Zurcher Kantonalbank (Zurich Cantonalbank) History No change 54,361 1,566 0.0% 0.0% 77 0 0.0% Q2 2026 Aug 11, 2026
Federation des caisses Desjardins du Quebec History No change 54,947 1,557 0.0% 0.0% 78 0 0.0% Q2 2026 Aug 13, 2026
VAN ECK ASSOCIATES CORP History No change 46,507 1,338 0.0% 0.0% 79 0 0.0% Q2 2026 Aug 14, 2026
GUARDIAN CAPITAL LP History No change 46,433 1,337 0.03% 0.03% 80 0 0.0% Q2 2026 Aug 14, 2026
INTACT INVESTMENT MANAGEMENT INC. History No change 40,489 1,166 0.03% 0.03% 81 0 0.0% Q2 2026 Jul 20, 2026
Aviso Financial Inc. History No change 40,111 1,155 0.04% 0.04% 82 0 0.0% Q2 2026 Aug 13, 2026
PenderFund Capital Management Ltd. History No change 37,700 1,086 0.14% 0.14% 83 0 0.0% Q2 2026 Aug 14, 2026
CITIGROUP INC History No change 36,651 1,056 0.0% 0.0% 84 0 0.0% Q2 2026 Aug 03, 2026
BANK OF NOVA SCOTIA TRUST CO History No change 35,291 1,015 0.08% 0.08% 85 0 0.0% Q2 2026 Aug 11, 2026
XTX Topco Ltd History No change 35,013 1,007 0.01% 0.01% 86 0 0.0% Q2 2026 Aug 14, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History No change 34,791 1,001 0.0% 0.0% 87 0 0.0% Q2 2026 Aug 14, 2026
AMERICAN CENTURY COMPANIES INC History No change 32,500 936 0.0% 0.0% 88 0 0.0% Q2 2026 Aug 12, 2026
Engineers Gate Manager LP History No change 31,363 902 0.01% 0.01% 89 0 0.0% Q2 2026 Aug 14, 2026
Verition Fund Management LLC History No change 29,513 849 0.0% 0.0% 90 0 0.0% Q2 2026 Aug 14, 2026
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO History No change 28,366 817 0.0% 0.0% 91 0 0.0% Q2 2026 Aug 17, 2026
FRANKLIN RESOURCES INC History No change 25,412 731 0.0% 0.0% 92 0 0.0% Q2 2026 Aug 13, 2026
Squarepoint Ops LLC History No change 24,760 712 0.0% 0.0% 93 0 0.0% Q2 2026 Aug 14, 2026
ExodusPoint Capital Management, LP History No change 22,100 636 0.0% 0.0% 94 0 0.0% Q2 2026 Aug 14, 2026
Vanguard Investments Australia, Ltd. History No change 21,874 630 0.0% 0.0% 95 0 0.0% Q2 2026 Aug 13, 2026
WELLS FARGO & COMPANY/MN History No change 19,748 568 0.0% 0.0% 96 0 0.0% Q2 2026 Aug 14, 2026
BARCLAYS PLC History No change 16,814 483 0.0% 0.0% 97 0 0.0% Q2 2026 Aug 14, 2026
ALLIANCEBERNSTEIN L.P. History No change 16,380 461 0.0% 0.0% 98 0 0.0% Q2 2026 Aug 14, 2026
Pictet Asset Management Holding SA History No change 15,987 460 0.0% 0.0% 99 0 0.0% Q2 2026 Jul 30, 2026
Purpose Unlimited Inc. History No change 15,754 454 0.02% 0.02% 100 0 0.0% Q2 2026 Aug 13, 2026
Northwest & Ethical Investments L.P. History No change 15,573 448 0.01% 0.01% 101 0 0.0% Q2 2026 Aug 13, 2026
Aberdeen Group plc History No change 13,483 388 0.0% 0.0% 102 0 0.0% Q2 2026 Jul 31, 2026
TRUE Private Wealth Advisors History No change 12,080 347 0.03% 0.03% 103 0 0.0% Q2 2026 Jul 23, 2026
Savant Capital, LLC History No change 11,997 345 0.0% 0.0% 104 0 0.0% Q2 2026 Aug 10, 2026
Mariner, LLC History No change 11,879 341 0.0% 0.0% 105 0 0.0% Q2 2026 Aug 13, 2026
Investment Management Corp of Ontario History No change 11,816 340 0.0% 0.0% 106 0 0.0% Q2 2026 Aug 14, 2026
Apella Capital, LLC History New 18,307 324 0.0% — 107 +18,307 New Q3 2026 Oct 08, 2026
DEUTSCHE BANK AG\ History No change 10,811 311 0.0% 0.0% 108 0 0.0% Q2 2026 Aug 07, 2026
HRT FINANCIAL LP History No change 10,824 311 0.0% 0.0% 109 0 0.0% Q2 2026 Aug 14, 2026
STIFEL FINANCIAL CORP History No change 9,016 259 0.0% 0.0% 110 0 0.0% Q2 2026 Aug 12, 2026
Campbell & CO Investment Adviser LLC History No change 8,503 244 0.01% 0.01% 111 0 0.0% Q2 2026 Aug 03, 2026
Gotham Asset Management, LLC History No change 8,395 241 0.0% 0.0% 112 0 0.0% Q2 2026 Aug 14, 2026
Invesco Ltd. History No change 8,279 238 0.0% 0.0% 113 0 0.0% Q2 2026 Aug 14, 2026
Quadrature Capital Ltd History No change 8,100 233 0.0% 0.0% 114 0 0.0% Q2 2026 Aug 06, 2026
SkyView Investment Advisors, LLC History No change 7,500 216 0.17% 0.17% 115 0 0.0% Q2 2026 Sep 14, 2026
Fieldview Capital Management, LLC History No change 7,408 213 0.06% 0.06% 116 0 0.0% Q2 2026 Aug 14, 2026
Tower Research Capital LLC (TRC) History No change 3,900 112 0.0% 0.0% 117 0 0.0% Q2 2026 Aug 11, 2026
ACADIAN ASSET MANAGEMENT LLC History No change 2,900 83 0.0% 0.0% 118 0 0.0% Q2 2026 Aug 13, 2026
Russell Investments Group, Ltd. History No change 1,758 50 0.0% 0.0% 119 0 0.0% Q2 2026 Aug 06, 2026
JPMORGAN CHASE & CO History No change 1,382 38 0.0% 0.0% 120 0 0.0% Q2 2026 Aug 12, 2026
State of Wyoming History No change 1,162 33 0.0% 0.0% 121 0 0.0% Q2 2026 Aug 06, 2026
Smartleaf Asset Management LLC History No change 1,052 29 0.0% 0.0% 122 0 0.0% Q2 2026 Aug 12, 2026
Hillsdale Investment Management Inc. History No change 900 25 0.0% 0.0% 123 0 0.0% Q2 2026 Aug 12, 2026
SIMPLEX TRADING, LLC History No change 846 24 0.0% 0.0% 124 0 0.0% Q2 2026 Aug 12, 2026
Blue Trust, Inc. History No change 733 21 0.0% 0.0% 125 0 0.0% Q2 2026 Jul 21, 2026
Guardian Partners Inc. History No change 760 21 0.0% 0.0% 126 0 0.0% Q2 2026 Jul 29, 2026
Pacer Advisors, Inc. History No change 604 17 0.0% 0.0% 127 0 0.0% Q2 2026 Aug 13, 2026
Clearstead Advisors, LLC History No change 539 15 0.0% 0.0% 128 0 0.0% Q2 2026 Aug 06, 2026
Farther Finance Advisors, LLC History Added to 412 7 0.0% 0.0% 129 +149 56.65% Q3 2026 Oct 08, 2026
HANTZ FINANCIAL SERVICES, INC. History No change 168 5 0.0% 0.0% 130 0 0.0% Q2 2026 Aug 13, 2026
OSAIC HOLDINGS, INC. History No change 208 5 0.0% 0.0% 131 0 0.0% Q2 2026 Aug 14, 2026
NBH Bank History No change 113 3 0.0% 0.0% 132 0 0.0% Q2 2026 Aug 14, 2026
WealthCollab, LLC History No change 89 2 0.0% 0.0% 133 0 0.0% Q2 2026 Aug 10, 2026
FIDUCIARY FINANCIAL ADVISORS History No change 80 2 0.0% 0.0% 134 0 0.0% Q2 2026 Aug 13, 2026
Rockefeller Capital Management L.P. History No change 48 1 0.0% 0.0% 135 0 0.0% Q2 2026 Aug 13, 2026
Bell Investment Advisors, Inc History No change 35 1 0.0% 0.0% 136 0 0.0% Q2 2026 Aug 06, 2026
BlackRock, Inc. History No change 58 1 0.0% 0.0% 137 0 0.0% Q2 2026 Aug 07, 2026
Silver Grove Financial Group, Inc. History No change 36 1 0.0% 0.0% 138 0 0.0% Q2 2026 Aug 13, 2026
Leonteq Securities AG History No change 4 0 — — — 0 0.0% Q2 2026 Jul 27, 2026
EverSource Wealth Advisors, LLC History No change 20 0 — — — 0 0.0% Q2 2026 Jul 24, 2026
Larson Financial Group LLC History No change 12 0 — — — 0 0.0% Q2 2026 Aug 14, 2026
Caitong International Asset Management Co., Ltd History No change 4 0 — — — 0 0.0% Q2 2026 Aug 04, 2026