ATS Corp /ATS - ATS

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q2 2026 · Compare: Q1 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% 75.48% 1 0 0.0% Q2 2026 Aug 14, 2026
ROYAL BANK OF CANADA History Added to 7,881,423 226,828 0.03% 0.04% 2 +119,585 1.54% Q2 2026 Aug 14, 2026
EdgePoint Investment Group Inc. History Reduced 7,004,577 201,699 1.52% 1.62% 3 -163,535 -2.28% Q2 2026 Aug 14, 2026
Beutel, Goodman & Co Ltd. History Reduced 4,796,922 138,218 1.02% 1.04% 4 -657,827 -12.06% Q2 2026 Aug 12, 2026
Turtle Creek Asset Management Inc. History Reduced 3,084,567 88,773 3.47% 5.17% 5 -1,812,102 -37.01% Q2 2026 Aug 14, 2026
BANK OF MONTREAL /CAN/ History Reduced 3,062,973 88,199 0.03% 0.03% 6 -52,387 -1.68% Q2 2026 Aug 12, 2026
FMR LLC History Added to 2,905,456 83,747 0.0% 0.0% 7 +627,984 27.57% Q2 2026 Aug 13, 2026
FAIRFAX FINANCIAL HOLDINGS LTD/ CAN History No change 2,486,400 70,487 2.67% 3.57% 8 0 0.0% Q2 2026 Aug 14, 2026
VANGUARD CAPITAL MANAGEMENT LLC History Added to 2,398,431 69,132 0.0% 0.0% 9 +31,701 1.34% Q2 2026 Aug 13, 2026
Jupiter Topco LLC History New 2,322,073 66,907 0.03% — 10 +2,322,073 New Q2 2026 Aug 14, 2026
JANUS HENDERSON GROUP PLC History No change 2,297,214 64,543 0.03% 0.03% 11 0 0.0% Q1 2026 May 18, 2026
Hill City Capital, LP History No change 1,649,857 47,482 1.11% 1.66% 12 0 0.0% Q2 2026 Aug 17, 2026
TD Waterhouse Canada Inc. History Added to 1,683,683 47,430 0.12% 0.14% 13 +49,234 3.01% Q2 2026 Jul 27, 2026
ACK Asset Management LLC History Reduced 1,500,000 43,170 5.04% 6.5% 14 -346,196 -18.75% Q2 2026 Aug 13, 2026
FIL Ltd History Reduced 1,326,851 38,235 0.03% 0.04% 15 -451,330 -25.38% Q2 2026 Aug 13, 2026
Alberta Investment Management Corp History Added to 1,177,491 33,903 0.19% 0.16% 16 +237,300 25.24% Q2 2026 Aug 06, 2026
Scheer, Rowlett & Associates Investment Management Ltd. History Reduced 1,175,268 33,842 2.43% 2.4% 17 -6,669 -0.56% Q2 2026 Aug 12, 2026
VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. History Reduced 795,619 32,524 0.25% 0.3% 18 -67,867 -7.86% Q2 2026 Aug 14, 2026
BANK OF AMERICA CORP /DE/ History Added to 1,122,152 32,295 0.0% 0.0% 19 +176,277 18.64% Q2 2026 Aug 14, 2026
Connor, Clark & Lunn Investment Management Ltd. History Reduced 1,089,460 31,371 0.06% 0.15% 20 -1,175,297 -51.9% Q2 2026 Aug 12, 2026
NORGES BANK History New 1,084,181 31,219 0.0% — 21 +1,084,181 New Q2 2026 Aug 12, 2026
Clearbridge Investments, LLC History Reduced 1,060,487 30,520 0.03% 0.03% 22 -30,804 -2.82% Q2 2026 Aug 13, 2026
Legal & General Group Plc History Added to 1,056,408 30,403 0.01% 0.0% 23 +444,719 72.7% Q2 2026 Aug 14, 2026
TD ASSET MANAGEMENT INC History Reduced 1,003,596 28,917 0.03% 0.03% 24 -418,863 -29.45% Q2 2026 Aug 04, 2026
Marathon Asset Management Ltd History Reduced 954,485 27,500 1.12% 1.18% 25 -139,426 -12.75% Q2 2026 Aug 14, 2026
NATIONAL BANK OF CANADA /FI/ History Added to 855,316 24,208 0.02% 0.02% 26 +207,034 31.94% Q2 2026 Aug 10, 2026
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. History Added to 788,784 22,728 0.03% 0.03% 27 +30,471 4.02% Q2 2026 Aug 14, 2026
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ History Added to 540,733 22,105 0.01% 0.01% 28 +6,776 1.27% Q2 2026 Aug 03, 2026
MACKENZIE FINANCIAL CORP History Reduced 524,774 21,452 0.02% 0.02% 29 -91,730 -14.88% Q2 2026 Aug 13, 2026
VANGUARD FIDUCIARY TRUST CO History Reduced 724,271 20,876 0.0% 0.01% 30 -3,787 -0.52% Q2 2026 Aug 13, 2026
Langdon Equity Partners History New 600,000 17,286 9.66% — 31 +600,000 New Q2 2026 Aug 13, 2026
TORONTO DOMINION BANK History Added to 480,616 13,839 0.02% 0.0% 32 +387,441 415.82% Q2 2026 Aug 14, 2026
PUBLIC SECTOR PENSION INVESTMENT BOARD History Added to 378,001 10,884 0.03% 0.03% 33 +21,164 5.93% Q2 2026 Aug 13, 2026
1832 Asset Management L.P. History Reduced 355,745 10,238 0.01% 0.01% 34 -45,951 -11.44% Q2 2026 Aug 13, 2026
Waratah Capital Advisors Ltd. History Added to 334,923 9,639 0.33% 0.24% 35 +110,940 49.53% Q2 2026 Aug 11, 2026
CIBC WORLD MARKET INC. History Reduced 327,087 9,419 0.02% 0.02% 36 -19,519 -5.63% Q2 2026 Aug 13, 2026
ArrowMark Colorado Holdings LLC History Added to 280,000 8,058 0.34% 0.13% 37 +106,000 60.92% Q2 2026 Aug 13, 2026
Vanguard Global Advisers, LLC History Added to 274,103 7,900 0.0% 0.0% 38 +15,105 5.83% Q2 2026 Aug 13, 2026
Roubaix Capital, LLC History New 246,909 7,106 2.55% — 39 +246,909 New Q2 2026 Aug 10, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC History Added to 243,525 7,016 0.0% 0.0% 40 +4,871 2.04% Q2 2026 Aug 14, 2026
MORGAN STANLEY History Added to 234,236 6,741 0.0% 0.0% 41 +133,846 133.33% Q2 2026 Aug 13, 2026
GOLDMAN SACHS GROUP INC History Added to 223,762 6,439 0.0% 0.0% 42 +171,511 328.24% Q2 2026 Aug 14, 2026
UBS Group AG History Reduced 222,553 6,405 0.0% 0.0% 43 -5,075 -2.23% Q2 2026 Aug 13, 2026
Dixon Mitchell Investment Counsel Inc. History No change 211,025 6,080 0.2% 0.21% 44 0 0.0% Q2 2026 Aug 13, 2026
SIG North Trading, ULC History Added to 210,675 6,063 0.11% 0.04% 45 +141,000 202.37% Q2 2026 Aug 14, 2026
SCOTIA CAPITAL INC. History Added to 212,719 6,021 0.02% 0.02% 46 +20,189 10.49% Q2 2026 Aug 11, 2026
JANE STREET GROUP, LLC History Added to 199,635 5,748 0.0% 0.0% 47 +116,994 141.57% Q2 2026 Aug 14, 2026
Granite Investment Partners, LLC History Added to 195,894 5,637 0.29% 0.3% 48 +22,863 13.21% Q2 2026 Aug 07, 2026
Van Berkom & Associates Inc. History Reduced 188,066 5,410 0.17% 0.24% 49 -69,294 -26.92% Q2 2026 Aug 05, 2026
Focus Partners Wealth History No change 181,975 5,237 0.01% 0.01% 50 0 0.0% Q2 2026 Aug 12, 2026
FIRST TRUST ADVISORS LP History Added to 181,592 5,234 0.0% 0.0% 51 +27,189 17.61% Q2 2026 Aug 11, 2026
Swiss National Bank History Added to 168,000 4,828 0.0% 0.0% 52 +3,600 2.19% Q2 2026 Aug 11, 2026
DIMENSIONAL FUND ADVISORS LP History Added to 167,149 4,808 0.0% 0.0% 53 +44,693 36.5% Q2 2026 Aug 11, 2026
Candelo Capital Management LP History Added to 165,100 4,758 2.93% 3.53% 54 +13,412 8.84% Q2 2026 Aug 14, 2026
Delaney Capital Management Ltd. History Added to 160,392 4,614 0.73% 0.7% 55 +6,315 4.1% Q2 2026 Aug 14, 2026
NewGen Asset Management Ltd History New 150,000 4,317 1.78% — 56 +150,000 New Q2 2026 Aug 13, 2026
CIBC Asset Management Inc History Added to 138,246 3,976 0.01% 0.01% 57 +4,060 3.03% Q2 2026 Aug 03, 2026
Front Street Capital Management, Inc. History Reduced 124,973 3,596 0.41% 0.98% 58 -136,115 -52.13% Q2 2026 Aug 13, 2026
HARBOR CAPITAL ADVISORS, INC. History Added to 115,198 3,315 0.23% 0.24% 59 +12,030 11.66% Q2 2026 Aug 07, 2026
LOUISBOURG INVESTMENTS INC. History Added to 111,104 3,196 0.59% 0.45% 60 +26,249 30.93% Q2 2026 Jul 22, 2026
Polar Asset Management Partners Inc. History New 105,203 3,027 0.05% — 61 +105,203 New Q2 2026 Aug 14, 2026
BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp History Added to 101,546 2,924 0.02% 0.01% 62 +31,124 44.2% Q2 2026 Aug 13, 2026
K.J. Harrison & Partners Inc History New 100,000 2,876 0.41% — 63 +100,000 New Q2 2026 Aug 07, 2026
MONTRUSCO BOLTON INVESTMENTS INC. History Reduced 99,056 2,854 0.04% 0.07% 64 -71,900 -42.06% Q2 2026 Jul 21, 2026
SEI INVESTMENTS CO History Reduced 97,376 2,802 0.0% 0.0% 65 -70,444 -41.98% Q2 2026 Aug 14, 2026
PCJ Investment Counsel Ltd. History Added to 85,640 2,466 0.71% 0.4% 66 +35,640 71.28% Q2 2026 Aug 12, 2026
HALLSTATT ADVISORS L.P. History New 83,020 2,390 1.68% — 69 +83,020 New Q2 2026 Aug 03, 2026
LAZARD ASSET MANAGEMENT LLC History Added to 83,052 2,390 0.0% 0.0% 67 +13,140 18.8% Q2 2026 Aug 14, 2026
Canoe Financial LP History Reduced 83,024 2,390 0.03% 0.03% 68 -4,406 -5.04% Q2 2026 Jul 16, 2026
CITADEL ADVISORS LLC History Added to 82,308 2,368 0.0% 0.0% 70 +1,069 1.32% Q2 2026 Sep 02, 2026
MANUFACTURERS LIFE INSURANCE COMPANY, THE History Reduced 73,654 2,118 0.0% 0.0% 71 -476 -0.64% Q2 2026 Sep 09, 2026
GEODE CAPITAL MANAGEMENT, LLC History Added to 69,598 2,044 0.0% 0.0% 72 +800 1.16% Q2 2026 Aug 12, 2026
VANGUARD ASSET MANAGEMENT, Ltd History No change 66,830 1,926 0.0% 0.0% 73 0 0.0% Q2 2026 Aug 13, 2026
CenterBook Partners LP History New 65,180 1,875 0.09% — 74 +65,180 New Q2 2026 Aug 11, 2026
Nuveen, LLC History No change 62,584 1,803 0.0% 0.0% 75 0 0.0% Q2 2026 Aug 11, 2026
Caldwell Investment Management Ltd. History No change 60,800 1,749 1.15% 0.65% 76 0 0.0% Q2 2026 Aug 11, 2026
BOOTHBAY FUND MANAGEMENT, LLC History New 59,867 1,723 0.02% — 77 +59,867 New Q2 2026 Aug 14, 2026
Zurcher Kantonalbank (Zurich Cantonalbank) History Added to 54,361 1,566 0.0% 0.0% 78 +22,911 72.85% Q2 2026 Aug 11, 2026
Federation des caisses Desjardins du Quebec History Reduced 54,947 1,557 0.0% 0.01% 79 -58,100 -51.39% Q2 2026 Aug 13, 2026
VAN ECK ASSOCIATES CORP History Added to 46,507 1,338 0.0% 0.0% 80 +22,236 91.62% Q2 2026 Aug 14, 2026
GUARDIAN CAPITAL LP History Reduced 46,433 1,337 0.03% 0.03% 81 -522 -1.11% Q2 2026 Aug 14, 2026
INTACT INVESTMENT MANAGEMENT INC. History Reduced 40,489 1,166 0.03% 0.04% 82 -12,900 -24.16% Q2 2026 Jul 20, 2026
Aviso Financial Inc. History Reduced 40,111 1,155 0.04% 0.05% 83 -5,649 -12.34% Q2 2026 Aug 13, 2026
PenderFund Capital Management Ltd. History Added to 37,700 1,086 0.14% 0.09% 84 +17,700 88.5% Q2 2026 Aug 14, 2026
CITIGROUP INC History Added to 36,651 1,056 0.0% 0.0% 85 +9,835 36.68% Q2 2026 Aug 03, 2026
BANK OF NOVA SCOTIA TRUST CO History Added to 35,291 1,015 0.08% 0.08% 86 +959 2.79% Q2 2026 Aug 11, 2026
XTX Topco Ltd History New 35,013 1,007 0.01% — 87 +35,013 New Q2 2026 Aug 14, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History New 34,791 1,001 0.0% — 88 +34,791 New Q2 2026 Aug 14, 2026
AMERICAN CENTURY COMPANIES INC History New 32,500 936 0.0% — 89 +32,500 New Q2 2026 Aug 12, 2026
Engineers Gate Manager LP History Added to 31,363 902 0.01% 0.0% 90 +18,311 140.29% Q2 2026 Aug 14, 2026
Verition Fund Management LLC History New 29,513 849 0.0% — 91 +29,513 New Q2 2026 Aug 14, 2026
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO History Added to 28,366 817 0.0% 0.0% 92 +1,031 3.77% Q2 2026 Aug 17, 2026
FRANKLIN RESOURCES INC History Reduced 25,412 731 0.0% 0.0% 93 -222,055 -89.73% Q2 2026 Aug 13, 2026
Squarepoint Ops LLC History New 24,760 712 0.0% — 94 +24,760 New Q2 2026 Aug 14, 2026
ExodusPoint Capital Management, LP History Added to 22,100 636 0.0% 0.01% 95 +50 0.23% Q2 2026 Aug 14, 2026
Vanguard Investments Australia, Ltd. History Added to 21,874 630 0.0% 0.0% 96 +2,559 13.25% Q2 2026 Aug 13, 2026
WELLS FARGO & COMPANY/MN History Added to 19,748 568 0.0% 0.0% 97 +18,241 1210.42% Q2 2026 Aug 14, 2026
BARCLAYS PLC History Added to 16,814 483 0.0% 0.0% 98 +13,836 464.61% Q2 2026 Aug 14, 2026
ALLIANCEBERNSTEIN L.P. History Added to 16,380 461 0.0% 0.0% 99 +7,420 82.81% Q2 2026 Aug 14, 2026
Pictet Asset Management Holding SA History Reduced 15,987 460 0.0% 0.0% 100 -436 -2.65% Q2 2026 Jul 30, 2026
Purpose Unlimited Inc. History Reduced 15,754 454 0.02% 0.03% 101 -12,813 -44.85% Q2 2026 Aug 13, 2026
Northwest & Ethical Investments L.P. History Added to 15,573 448 0.01% 0.01% 102 +4,590 41.79% Q2 2026 Aug 13, 2026
Aberdeen Group plc History Reduced 13,483 388 0.0% 0.0% 103 -12,754 -48.61% Q2 2026 Jul 31, 2026
TRUE Private Wealth Advisors History No change 12,080 347 0.03% 0.03% 104 0 0.0% Q2 2026 Jul 23, 2026
Savant Capital, LLC History Reduced 11,997 345 0.0% 0.0% 105 -660 -5.21% Q2 2026 Aug 10, 2026
Mariner, LLC History Reduced 11,879 341 0.0% 0.0% 106 -4,358 -26.84% Q2 2026 Aug 13, 2026
Investment Management Corp of Ontario History Added to 11,816 340 0.0% 0.0% 107 +100 0.85% Q2 2026 Aug 14, 2026
HRT FINANCIAL LP History New 10,824 311 0.0% — 109 +10,824 New Q2 2026 Aug 14, 2026
DEUTSCHE BANK AG\ History Added to 10,811 311 0.0% 0.0% 108 +59 0.55% Q2 2026 Aug 07, 2026
STIFEL FINANCIAL CORP History Reduced 9,016 259 0.0% 0.0% 110 -2,875 -24.18% Q2 2026 Aug 12, 2026
Campbell & CO Investment Adviser LLC History Added to 8,503 244 0.01% 0.01% 111 +76 0.9% Q2 2026 Aug 03, 2026
Gotham Asset Management, LLC History Added to 8,395 241 0.0% 0.0% 112 +724 9.44% Q2 2026 Aug 14, 2026
Invesco Ltd. History Reduced 8,279 238 0.0% 0.0% 113 -334,897 -97.59% Q2 2026 Aug 14, 2026
Quadrature Capital Ltd History New 8,100 233 0.0% — 114 +8,100 New Q2 2026 Aug 06, 2026
SkyView Investment Advisors, LLC History Reduced 7,500 216 0.17% 0.04% 115 -3,466 -31.61% Q2 2026 Sep 14, 2026
Fieldview Capital Management, LLC History New 7,408 213 0.06% — 116 +7,408 New Q2 2026 Aug 14, 2026
Tower Research Capital LLC (TRC) History Reduced 3,900 112 0.0% 0.01% 117 -4,000 -50.63% Q2 2026 Aug 11, 2026
ACADIAN ASSET MANAGEMENT LLC History Reduced 2,900 83 0.0% 0.0% 118 -2,500 -46.3% Q2 2026 Aug 13, 2026
Russell Investments Group, Ltd. History Reduced 1,758 50 0.0% 0.0% 119 -1,070 -37.84% Q2 2026 Aug 06, 2026
JPMORGAN CHASE & CO History Added to 1,382 38 0.0% 0.0% 120 +419 43.51% Q2 2026 Aug 12, 2026
State of Wyoming History Reduced 1,162 33 0.0% 0.0% 121 -53 -4.36% 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 Added to 900 25 0.0% 0.0% 123 +300 50.0% Q2 2026 Aug 12, 2026
SIMPLEX TRADING, LLC History New 846 24 0.0% — 124 +846 New Q2 2026 Aug 12, 2026
Guardian Partners Inc. History New 760 21 0.0% — 126 +760 New Q2 2026 Jul 29, 2026
Blue Trust, Inc. History No change 733 21 0.0% 0.0% 125 0 0.0% Q2 2026 Jul 21, 2026
Pacer Advisors, Inc. History Added to 604 17 0.0% 0.0% 127 +365 152.72% Q2 2026 Aug 13, 2026
Clearstead Advisors, LLC History New 539 15 0.0% — 128 +539 New Q2 2026 Aug 06, 2026
Farther Finance Advisors, LLC History No change 263 7 0.0% 0.0% 129 0 0.0% Q2 2026 Jul 17, 2026
HANTZ FINANCIAL SERVICES, INC. History Reduced 168 5 0.0% 0.0% 130 -2,549 -93.82% Q2 2026 Aug 13, 2026
OSAIC HOLDINGS, INC. History Reduced 208 5 0.0% 0.0% 131 -146 -41.24% Q2 2026 Aug 14, 2026
NBH Bank History New 113 3 0.0% — 133 +113 New Q2 2026 Aug 14, 2026
Bank of Jackson Hole Trust History No change 113 3 0.0% 0.0% 132 0 0.0% Q1 2026 May 12, 2026
FIDUCIARY FINANCIAL ADVISORS History New 80 2 0.0% — 135 +80 New Q2 2026 Aug 13, 2026
WealthCollab, LLC History No change 89 2 0.0% 0.0% 134 0 0.0% Q2 2026 Aug 10, 2026
Rockefeller Capital Management L.P. History New 48 1 0.0% — 138 +48 New Q2 2026 Aug 13, 2026
Silver Grove Financial Group, Inc. History New 36 1 0.0% — 139 +36 New Q2 2026 Aug 13, 2026
Bell Investment Advisors, Inc History Added to 35 1 0.0% — 136 +15 75.0% 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
Vinva Investment Management Ltd History Closed out 0 0 — 0.45% — -2,088,947 -100.0% Q2 2026 Aug 14, 2026
PRINCIPAL FINANCIAL GROUP INC History Closed out 0 0 — 0.01% — -620,840 -100.0% Q2 2026 Aug 04, 2026
ROYCE & ASSOCIATES LP History Closed out 0 0 — 0.05% — -179,500 -100.0% Q2 2026 Aug 14, 2026
D. E. Shaw & Co., Inc. History Closed out 0 0 — 0.0% — -30,200 -100.0% Q2 2026 Aug 14, 2026
Numerai GP LLC History Closed out 0 0 — 0.08% — -27,538 -100.0% Q2 2026 Aug 14, 2026
BALYASNY ASSET MANAGEMENT L.P. History Closed out 0 0 — 0.0% — -14,124 -100.0% Q2 2026 Aug 14, 2026
MARSHALL WACE, LLP History Closed out 0 0 — 0.0% — -9,920 -100.0% Q2 2026 Aug 13, 2026
Brevan Howard Capital Management LP History Closed out 0 0 — 0.0% — -8,424 -100.0% Q2 2026 Aug 14, 2026
Orion Porfolio Solutions, LLC History Closed out 0 0 — 0.0% — -7,994 -100.0% Q2 2026 Aug 14, 2026
NewEdge Advisors, LLC History Closed out 0 0 — 0.0% — -214 -100.0% Q2 2026 Aug 12, 2026
Larson Financial Group LLC History Reduced 12 0 — 0.0% — -186 -93.94% Q2 2026 Aug 14, 2026
WELLINGTON-ALTUS USA INC. History Closed out 0 0 — 0.0% — -125 -100.0% Q2 2026 Sep 17, 2026
Root Financial Partners, LLC History Closed out 0 0 — 0.0% — -40 -100.0% Q2 2026 Jul 29, 2026
EverSource Wealth Advisors, LLC History Reduced 20 0 — 0.0% — -36 -64.29% Q2 2026 Jul 24, 2026
JONES FINANCIAL COMPANIES LLLP History Closed out 0 0 — 0.0% — -36 -100.0% Q2 2026 Aug 14, 2026
Caitong International Asset Management Co., Ltd History Reduced 4 0 — — — -13 -76.47% Q2 2026 Aug 04, 2026
Leonteq Securities AG History No change 4 0 — — — 0 0.0% Q2 2026 Jul 27, 2026