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Disclosery

ATS ATS CORPORATION

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COM (common), issuer CIK 1394832

134 managers (140 13F filers) reported a position in ATS shares at 2026-06-30, 81,589,252 shares in all. 23 filers opened a position and 13 filers sold out during the quarter.

Managers
134
13F filers
140
New
23
Added
55
Reduced
45
Sold out
13
Shares held by filers
81,589,252

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

Each filer's latest stake. The shares are the aggregate the reporting persons state, which can include entities that file no 13F.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q2 2026

Filers in the available 13F reports with a share position at 2026-06-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
MASON CAPITAL MANAGEMENT LLC16,404,170$472M77.8%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA7,881,423$227M0.04%+119,58513F-HRTimelineGroup
EdgePoint Investment Group Inc.7,004,577$202M1.52%-163,53513F-HRTimeline
Beutel, Goodman & Co Ltd.4,796,922$138M1.02%-657,82713F-HRTimeline
VANGUARD GROUP INCgroup of 5 filers holding3,485,509$100M+45,578Timeline
TURTLE CREEK ASSET MANAGEMENT INC.3,084,567$88.8M3.47%-1,812,10213F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/3,062,973$88.2M0.03%-52,38713F-HRTimelineGroup
FMR LLCin group FMR LLC2,905,456$83.7M<0.01%+627,98413F-HRTimelineGroup
FAIRFAX FINANCIAL HOLDINGS LTD/ CANin group FAIRFAX FINANCIAL HOLDINGS LT…2,486,400$70.5M2.67%013F-HRTimelineGroup
Jupiter Topco LLCin group Janus Henderson2,322,073$66.9M0.03%13F-HRTimelineGroup
Hill City Capital, LP1,649,857$47.5M1.11%013F-HR/ATimeline
TD Waterhouse Canada Inc.1,683,683$47.4M0.12%+49,23413F-HRTimeline
ACK Asset Management LLC1,500,000$43.2M5.04%-346,19613F-HRTimeline
FIL Ltdin group FIL Ltd1,326,851$38.2M0.03%-451,33013F-HRTimelineGroup
Alberta Investment Management Corp1,177,491$33.9M0.2%+237,30013F-HRTimeline
Scheer, Rowlett & Associates Investment…1,175,268$33.8M2.43%-6,66913F-HRTimeline
VAN LANSCHOT KEMPEN INVESTMENT MANAGEME…795,619$32.5M0.25%-67,86713F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/1,122,152$32.3M<0.01%+176,27713F-HRTimelineGroup
Connor, Clark & Lunn Investment Managem…1,089,460$31.4M0.06%-1,175,29713F-HRTimeline
Franklin Resourcesgroup of 2 filers holding1,085,899$31.3M-252,859Timeline
NORGES BANK1,084,181$31.2M<0.01%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc1,056,408$30.4M0.01%+444,71913F-HRTimelineGroup
TD Asset Management Inc1,003,596$28.9M0.03%-418,86313F-HRTimeline
Marathon Asset Management Ltd954,485$27.5M1.12%-139,42613F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/855,316$24.2M0.02%+207,03413F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…788,784$22.7M0.03%+30,47113F-HRTimelineGroup
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…540,733$22.1M0.01%+6,77613F-HRTimelineGroup
MACKENZIE FINANCIAL CORP524,774$21.5M0.02%-91,73013F-HRTimeline
Langdon Equity Partners600,000$17.3M9.66%new13F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK406,916$11.7M0.02%+313,74113F-HRTimelineGroup
Public Sector Pension Investment Board378,001$10.9M0.03%+21,16413F-HR/ATimeline
1832 Asset Management L.P.355,745$10.2M0.01%-45,95113F-HRTimeline
Waratah Capital Advisors Ltd.334,923$9.64M0.74%+110,94013F-HRTimeline
CIBC WORLD MARKET INC.327,087$9.42M0.02%-19,51913F-HRTimeline
ArrowMark Colorado Holdings LLC280,000$8.06M0.34%+106,00013F-HRTimeline
Roubaix Capital, LLC246,909$7.11M2.55%new13F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co243,525$7.02M<0.01%+4,87113F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY234,236$6.74M<0.01%+133,84613F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC223,762$6.44M<0.01%+171,51113F-HRTimelineGroup
UBS Group AGin group UBS Group AG222,553$6.41M<0.01%-5,07513F-HRTimelineGroup
Dixon Mitchell Investment Counsel Inc.211,025$6.08M0.2%013F-HRTimeline
SCOTIA CAPITAL INC.212,719$6.02M0.02%+20,18913F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC199,635$5.75M<0.01%+116,99413F-HRTimelineGroup
Granite Investment Partners, LLC195,894$5.64M0.29%+22,86313F-HRTimeline
Van Berkom & Associates Inc.188,066$5.41M0.17%-69,29413F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth181,975$5.24M0.01%013F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP181,592$5.23M<0.01%+27,18913F-HRTimelineGroup
Swiss National Bank168,000$4.83M<0.01%+3,60013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP167,149$4.81M<0.01%+44,69313F-HRTimelineGroup
Candelo Capital Management LP165,100$4.76M3.49%+13,41213F-HRTimeline
Delaney Capital Management Ltd.160,392$4.61M0.73%+6,31513F-HRTimeline
NewGen Asset Management Ltd150,000$4.32M2.37%new13F-HRTimeline
CIBC Asset Management Inc138,246$3.98M0.01%+4,06013F-HRTimeline
Front Street Capital Management, Inc.124,973$3.6M0.41%-136,11513F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.115,198$3.31M0.23%+12,03013F-HRTimeline
LOUISBOURG INVESTMENTS INC.111,104$3.2M0.59%+26,24913F-HRTimeline
Polar Asset Management Partners Inc.105,203$3.03M0.06%new13F-HRTimeline
BRITISH COLUMBIA INVESTMENT MANAGEMENT …101,546$2.92M0.02%+31,12413F-HRTimeline
K.J. Harrison & Partners Inc100,000$2.88M0.41%new13F-HRTimeline
MONTRUSCO BOLTON INVESTMENTS INC.99,056$2.85M0.04%-71,90013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO97,376$2.8M<0.01%-70,44413F-HRTimelineGroup
PCJ Investment Counsel Ltd.85,640$2.47M0.71%+35,64013F-HRTimeline
Canoe Financial LP83,024$2.39M0.03%-4,40613F-HRTimeline
HALLSTATT ADVISORS L.P.83,020$2.39M1.68%new13F-HRTimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC83,052$2.39M<0.01%+13,14013F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC82,308$2.37M<0.01%+1,06913F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …73,654$2.12M<0.01%-47613F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC69,598$2.04M<0.01%+80013F-HRTimelineGroup
CenterBook Partners LP65,180$1.88M0.09%new13F-HRTimeline
Nuveen, LLCin group TIAA62,584$1.8M<0.01%013F-HRTimelineGroup
Caldwell Investment Management Ltd.60,800$1.75M1.15%013F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC59,867$1.72M0.03%new13F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…54,361$1.57M<0.01%+22,91113F-HRTimeline
Federation des caisses Desjardins du Qu…54,947$1.56M<0.01%-58,10013F-HRTimeline
GUARDIAN CAPITAL LPgroup of 2 filers holding47,193$1.36M+238Timeline
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP46,507$1.34M<0.01%+22,23613F-HRTimelineGroup
INTACT INVESTMENT MANAGEMENT INC.in group INTACT INVESTMENT MANAGEMENT …40,489$1.17M0.03%-12,90013F-HRTimelineGroup
Aviso Financial Inc.40,111$1.16M0.04%-5,64913F-HRTimeline
PenderFund Capital Management Ltd.37,700$1.09M0.14%+17,70013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC36,651$1.06M<0.01%+9,83513F-HRTimelineGroup
BANK OF NOVA SCOTIA TRUST COin group BANK OF NOVA SCOTIA35,291$1.02M0.08%+95913F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd35,013$1.01M0.01%new13F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…34,791$1M<0.01%new13F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC32,500$937K<0.01%new13F-HRTimelineGroup
Engineers Gate Manager LP31,363$903K0.01%+18,31113F-HRTimeline
Verition Fund Management LLC29,513$849K0.01%new13F-HR/ATimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…28,366$817K<0.01%+1,03113F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC24,760$713K<0.01%new13F-HRTimelineGroup
SIG North Trading, ULC22,575$650K0.12%-3,70013F-HRTimeline
ExodusPoint Capital Management, LP22,100$636K0.01%+5013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN19,748$568K<0.01%+18,24113F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC16,814$484K<0.01%+13,83613F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.16,380$462K<0.01%+7,42013F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…15,987$461K<0.01%-43613F-HRTimelineGroup
Purpose Unlimited Inc.in group Purpose Unlimited Inc.15,754$454K0.02%-12,81313F-HRTimelineGroup
Northwest & Ethical Investments L.P.15,573$448K0.01%+4,59013F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc13,483$388K<0.01%-12,75413F-HRTimelineGroup
TRUE Private Wealth Advisors12,080$348K0.03%013F-HRTimeline
Savant Capital, LLC11,997$345K<0.01%-66013F-HRTimeline
Mariner, LLCin group Mariner, LLC11,879$342K<0.01%-4,35813F-HRTimelineGroup
Investment Management Corp of Ontario11,816$340K<0.01%+10013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\10,811$311K<0.01%+5913F-HRTimelineGroup
HRT FINANCIAL LP10,824$311K<0.01%new13F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP9,016$259K<0.01%-2,87513F-HRTimelineGroup
Campbell & CO Investment Adviser LLC8,503$245K0.01%+7613F-HRTimeline
Gotham Asset Management, LLC8,395$242K<0.01%+72413F-HRTimeline
Invesco Ltd.in group Invesco Ltd.8,279$238K<0.01%-334,89713F-HRTimelineGroup
Quadrature Capital Ltdin group Quadrature Capital Ltd8,100$233K<0.01%new13F-HRTimelineGroup
Fieldview Capital Management, LLC7,408$214K0.06%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…3,900$112K<0.01%-4,00013F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC2,900$83K<0.01%-2,50013F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…1,758$50.7K<0.01%-1,07013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,382$38.1K<0.01%+41913F-HRTimelineGroup
State of Wyoming1,162$33.4K<0.01%-5313F-HRTimeline
Smartleaf Asset Management LLC1,052$29K<0.01%013F-HRTimeline
Hillsdale Investment Management Inc.900$25.9K<0.01%+30013F-HRTimeline
SIMPLEX TRADING, LLC846$24.3K<0.01%new13F-HRTimeline
Blue Trust, Inc.733$21.1K<0.01%013F-HRTimeline
Pacer Advisors, Inc.604$17K<0.01%+36513F-HRTimeline
Clearstead Advisors, LLC539$15.5K<0.01%new13F-HRTimeline
Farther Finance Advisors, LLC263$7.57K<0.01%013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.208$5.99K<0.01%-14613F-HRTimelineGroup
HANTZ FINANCIAL SERVICES, INC.168$5K<0.01%-2,54913F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
NBH Bank113$3.25K<0.01%13F-HRTimeline
WealthCollab, LLC89$2.56K<0.01%013F-HRTimeline
FIDUCIARY FINANCIAL ADVISORS80$2.27K<0.01%new13F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.58$1.67K<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…48$1.38K<0.01%new13F-HRTimelineGroup
Silver Grove Financial Group, Inc.36$1.04K<0.01%new13F-HRTimeline
Bell Investment Advisors, Inc35$1.01K<0.01%+1513F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…20$576<0.01%-3613F-HRTimelineGroup
Larson Financial Group LLC12$345<0.01%-18613F-HRTimeline
Leonteq Securities AG4$164<0.01%013F-HRTimeline
Caitong International Asset Management …4$115<0.01%-1313F-HRTimeline

Events

  • Beutel, Goodman & Co Ltd. reported 4,796,922 ATS shares, 6.4% of the class, as of 2026-08-31, in a 13G/A filed 2026-10-06. 0001361974-26-000011

    Accepted , ingested