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Disclosery

ATS ATS CORPORATION

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COM (common), issuer CIK 1394832

126 managers (131 13F filers) reported a position in ATS shares at 2026-03-31, 85,077,592 shares in all. 19 filers opened a position and 14 filers sold out during the quarter.

Managers
126
13F filers
131
New
19
Added
46
Reduced
39
Sold out
14
Shares held by filers
85,077,592

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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$463M75.51%+840,60213F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA7,761,838$219M0.04%+117,29113F-HRTimelineGroup
EdgePoint Investment Group Inc.7,168,112$202M1.62%+279,32713F-HRTimeline
Beutel, Goodman & Co Ltd.5,454,749$153M1.04%-382,38913F-HRTimeline
TURTLE CREEK ASSET MANAGEMENT INC.4,896,669$138M5.17%-745,38313F-HR/ATimeline
VANGUARD GROUP INCgroup of 5 filers holding3,439,931$97MnewTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/3,115,360$87.8M0.04%+92,66713F-HRTimelineGroup
FAIRFAX FINANCIAL HOLDINGS LTD/ CANin group FAIRFAX FINANCIAL HOLDINGS LT…2,486,400$69.4M3.57%013F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson2,297,214$64.5M0.03%+1,435,37513F-HR/ATimelineGroup
FMR LLCin group FMR LLC2,277,472$64.2M<0.01%+159,70613F-HRTimelineGroup
Connor, Clark & Lunn Investment Managem…2,264,757$63.8M0.15%-220,88113F-HRTimeline
ACK Asset Management LLC1,846,196$52.1M6.5%013F-HRTimeline
FIL Ltdin group FIL Ltd1,778,181$50.1M0.04%+1,724,61213F-HRTimelineGroup
TD Waterhouse Canada Inc.1,634,449$46.9M0.14%+668,10013F-HRTimeline
Hill City Capital, LP1,649,857$46.5M1.66%013F-HRTimeline
TD Asset Management Inc1,422,459$40M0.03%+229,25113F-HRTimeline
Franklin Resourcesgroup of 2 filers holding1,338,758$37.8M+201,887Timeline
Vinva Investment Management Ltd2,088,947$36.5M0.45%new13F-HRTimeline
VAN LANSCHOT KEMPEN INVESTMENT MANAGEME…863,486$33.9M0.3%+48,45513F-HRTimeline
Scheer, Rowlett & Associates Investment…1,181,937$33.3M2.4%-44,51313F-HRTimeline
Marathon Asset Management Ltd1,093,911$30.7M1.18%-3,80013F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/945,875$26.7M<0.01%-154,50613F-HRTimelineGroup
Alberta Investment Management Corp940,191$26.5M0.16%-400,07413F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…758,313$21.3M0.03%-383,52213F-HRTimelineGroup
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…533,957$20.9M0.01%-24,71813F-HRTimelineGroup
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/648,282$18.1M0.02%+229,95013F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC620,840$17.4M0.01%-257,40013F-HRTimelineGroup
MACKENZIE FINANCIAL CORP616,504$17.4M0.02%-142,47613F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc611,689$17.2M<0.01%+69,66613F-HRTimelineGroup
1832 Asset Management L.P.401,696$11.3M0.01%-416,86313F-HRTimeline
Public Sector Pension Investment Board356,837$10.1M0.03%+69,00813F-HRTimeline
CIBC WORLD MARKET INC.346,606$9.77M0.02%-7,46313F-HRTimeline
Invesco Ltd.in group Invesco Ltd.343,176$9.68M<0.01%-929,04613F-HRTimelineGroup
Front Street Capital Management, Inc.261,088$7.36M0.98%-25,90613F-HRTimeline
Van Berkom & Associates Inc.257,360$7.24M0.24%-11,77613F-HR/ATimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co238,654$6.71M<0.01%+2,32213F-HRTimelineGroup
UBS Group AGin group UBS Group AG227,628$6.42M<0.01%-1,14613F-HRTimelineGroup
Waratah Capital Advisors Ltd.223,983$6.32M0.57%new13F-HRTimeline
Dixon Mitchell Investment Counsel Inc.211,025$5.93M0.21%013F-HRTimeline
SCOTIA CAPITAL INC.192,530$5.38M0.02%-2,48913F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth181,975$5.13M0.01%013F-HRTimelineGroup
ROYCE & ASSOCIATES LP179,500$5.06M0.05%+15,00013F-HRTimeline
ArrowMark Colorado Holdings LLC174,000$4.91M0.13%new13F-HRTimeline
Granite Investment Partners, LLC173,031$4.88M0.3%-30,84513F-HRTimeline
MONTRUSCO BOLTON INVESTMENTS INC.170,956$4.8M0.07%-83,72513F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO167,820$4.73M<0.01%+69,07813F-HRTimelineGroup
Swiss National Bank164,400$4.63M<0.01%013F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP154,403$4.35M<0.01%-29,72513F-HRTimelineGroup
Delaney Capital Management Ltd.154,077$4.33M0.7%+1,04013F-HRTimeline
Candelo Capital Management LP151,688$4.27M4.3%+126,98813F-HRTimeline
CIBC Asset Management Inc134,186$3.77M0.01%+2,68613F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP122,456$3.45M<0.01%+12,11413F-HRTimelineGroup
Federation des caisses Desjardins du Qu…113,047$3.16M0.01%-3,35713F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.103,168$2.91M0.24%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY100,390$2.83M<0.01%+78,89913F-HRTimelineGroup
TORONTO DOMINION BANKin group TORONTO DOMINION BANK93,175$2.63M0.01%+11,26513F-HRTimelineGroup
Canoe Financial LP87,430$2.46M0.03%+6,83013F-HRTimeline
LOUISBOURG INVESTMENTS INC.84,855$2.39M0.45%-122,27513F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC82,641$2.33M<0.01%+60,57813F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC81,239$2.29M<0.01%-67,60113F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …74,130$2.09M<0.01%-2,29613F-HRTimelineGroup
BRITISH COLUMBIA INVESTMENT MANAGEMENT …70,422$1.99M0.01%+26,66913F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC68,798$1.97M<0.01%+9,54313F-HRTimelineGroup
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC69,912$1.97M<0.01%+11,48613F-HRTimelineGroup
Nuveen, LLCin group TIAA62,584$1.76M<0.01%013F-HRTimelineGroup
Caldwell Investment Management Ltd.60,800$1.65M0.65%013F-HRTimeline
INTACT INVESTMENT MANAGEMENT INC.in group INTACT INVESTMENT MANAGEMENT …53,389$1.5M0.04%new13F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC52,251$1.47M<0.01%-233,12613F-HRTimelineGroup
PCJ Investment Counsel Ltd.50,000$1.41M0.4%new13F-HRTimeline
GUARDIAN CAPITAL LPin group GUARDIAN CAPITAL LP46,955$1.32M0.03%-10813F-HRTimelineGroup
Aviso Financial Inc.45,760$1.29M0.05%-5,96513F-HRTimeline
BANK OF NOVA SCOTIA TRUST COin group BANK OF NOVA SCOTIA34,332$968K0.08%+3,81813F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…31,450$884K<0.01%-33,18913F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.30,200$851K<0.01%-77,90013F-HRTimelineGroup
Purpose Unlimited Inc.in group Purpose Unlimited Inc.28,567$805K0.03%-23513F-HRTimelineGroup
Numerai GP LLC27,538$777K0.08%+11,23313F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…27,335$768K<0.01%+12013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC26,816$753K<0.01%+1,66713F-HRTimelineGroup
SIG North Trading, ULC26,275$741K0.15%-3,06713F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc26,237$740K<0.01%+6,23013F-HRTimelineGroup
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP24,271$684K<0.01%+10,70013F-HRTimelineGroup
ExodusPoint Capital Management, LP22,050$622K0.01%new13F-HRTimeline
PenderFund Capital Management Ltd.20,000$564K0.09%013F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…16,423$461K<0.01%+41713F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC16,237$458K<0.01%+4,07013F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management14,124$398K<0.01%new13F-HRTimelineGroup
Engineers Gate Manager LP13,052$368K<0.01%new13F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC12,657$357K<0.01%+1,28513F-HRTimelineGroup
TRUE Private Wealth Advisors12,080$341K0.03%013F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP11,891$335K<0.01%-70213F-HRTimelineGroup
Investment Management Corp of Ontario11,716$330K<0.01%+1,60013F-HRTimeline
Northwest & Ethical Investments L.P.10,983$309K0.01%+43013F-HRTimeline
SkyView Investment Advisors, LLC10,966$309K0.04%013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\10,752$303K<0.01%+49113F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP9,920$280K<0.01%new13F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.8,960$247K<0.01%013F-HRTimeline
Campbell & CO Investment Adviser LLC8,427$238K0.01%-37813F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…8,424$238K<0.01%new13F-HRTimelineGroup
Orion Porfolio Solutions, LLC7,994$225K<0.01%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…7,900$223K0.01%new13F-HRTimelineGroup
Gotham Asset Management, LLC7,671$216K<0.01%new13F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC5,400$151K<0.01%new13F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC2,978$84K<0.01%-2,28613F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…2,828$79.5K<0.01%-5,70113F-HRTimelineGroup
HANTZ FINANCIAL SERVICES, INC.2,717$77K<0.01%+2,54413F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN1,507$42.4K<0.01%+79613F-HR/ATimelineGroup
State of Wyoming1,215$34.3K<0.01%new13F-HRTimeline
Smartleaf Asset Management LLC1,052$28.5K<0.01%013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO963$26.1K<0.01%+41013F-HR/ATimelineGroup
Blue Trust, Inc.733$20.7K<0.01%013F-HRTimeline
Hillsdale Investment Management Inc.600$16.9K<0.01%013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.354$9.98K<0.01%+32413F-HRTimelineGroup
Farther Finance Advisors, LLC263$7.6K<0.01%013F-HRTimeline
Pacer Advisors, Inc.239$7K<0.01%+10213F-HR/ATimeline
NewEdge Advisors, LLC214$6.03K<0.01%new13F-HR/ATimeline
Larson Financial Group LLC198$5.58K<0.01%+7713F-HRTimeline
WELLINGTON-ALTUS USA INC.125$3.6K<0.01%new13F-HRTimeline
2UniFi Bank113$3.19K<0.01%-2413F-HRTimeline
WealthCollab, LLC89$2.51K<0.01%013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.58$1.64K<0.01%013F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…56$1.58K<0.01%-1313F-HR/ATimelineGroup
Root Financial Partners, LLC40$1.13K<0.01%013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP36$1.01K<0.01%013F-HRTimelineGroup
Bell Investment Advisors, Inc20$564<0.01%013F-HRTimeline
Caitong International Asset Management …17$479<0.01%new13F-HRTimeline
Leonteq Securities AG4$157<0.01%013F-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