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Disclosery

ATS ATS CORPORATION

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COM (common), issuer CIK 1394832

121 managers (123 13F filers) reported a position in ATS shares at 2025-03-31, 87,355,519 shares in all. 8 filers opened a position and 16 filers sold out during the quarter.

Managers
121
13F filers
123
New
8
Added
61
Reduced
43
Sold out
16
Shares held by filers
87,355,519

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 2025

Filers in the available 13F reports with a share position at 2025-03-31, 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 LLC15,563,568$388M90.83%+648,80313F-HRTimeline
TURTLE CREEK ASSET MANAGEMENT INC.8,301,528$207M5.82%-37,04513F-HRTimeline
Beutel, Goodman & Co Ltd.7,052,324$176M1.01%+536,64213F-HR/ATimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA6,480,168$162M0.04%+1,172,20413F-HR/ATimelineGroup
EdgePoint Investment Group Inc.5,017,996$125M1.01%+1,477,35713F-HRTimeline
VANGUARD GROUP INCin group VANGUARD GROUP INC3,220,572$80.3M<0.01%-8,69313F-HRTimelineGroup
FAIRFAX FINANCIAL HOLDINGS LTD/ CANin group FAIRFAX FINANCIAL HOLDINGS LT…2,486,400$60.8M3.29%013F-HRTimelineGroup
ACK Asset Management LLC2,013,196$50.2M8.24%-80,00013F-HRTimeline
Connor, Clark & Lunn Investment Managem…1,976,154$49.3M0.21%+304,89013F-HRTimeline
Burgundy Asset Management Ltd.1,768,782$44.1M0.46%+318,25413F-HRTimeline
TD Waterhouse Canada Inc.1,673,096$41.5M0.34%+37,87213F-HRTimeline
Franklin Resourcesgroup of 2 filers holding1,617,534$40.3M-28,334Timeline
FMR LLCin group FMR LLC1,486,643$37.1M<0.01%-609,82613F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.1,402,085$35M0.01%-209,05513F-HRTimelineGroup
Hill City Capital, LP1,299,857$32.4M2.41%new13F-HRTimeline
MACKENZIE FINANCIAL CORP1,200,263$29.9M0.04%+68,34213F-HRTimeline
Capital World Investors1,196,000$29.8M<0.01%-2,253,76213F-HRTimeline
TD Asset Management Inc1,156,862$28.8M0.03%+280,83113F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…1,111,800$27.7M0.06%-61,35213F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/1,055,964$26.3M<0.01%+247,91213F-HRTimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/1,045,567$26.1M0.01%+83,15613F-HRTimelineGroup
NORGES BANK1,027,456$25.6M<0.01%013F-HR/ATimeline
Alberta Investment Management Corp966,127$24.1M0.16%-120,57313F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson922,164$24M0.01%-54013F-HRTimelineGroup
1832 Asset Management L.P.845,052$21.1M0.04%+182,16313F-HRTimeline
FIL Ltdin group FIL Ltd816,427$20.4M0.02%-1,048,63713F-HRTimelineGroup
Galibier Capital Management Ltd.806,997$20.1M6.27%+89,42613F-HRTimeline
Fiera Capital Corpin group Fiera Capital Corp723,111$18M0.07%+1,81413F-HRTimelineGroup
MOORE CAPITAL MANAGEMENT, LP722,482$18M0.6%new13F-HR/ATimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC696,840$17.4M0.01%+28,70013F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…641,202$16M0.04%+202,90013F-HRTimeline
Scheer, Rowlett & Associates Investment…632,491$15.8M1.17%+483,50713F-HRTimeline
Canoe Financial LP613,299$15.3M0.24%-28,69013F-HRTimeline
AGF MANAGEMENT LTDin group AGF MANAGEMENT LTD541,730$13.5M0.07%013F-HRTimelineGroup
NICOLA WEALTH MANAGEMENT LTD.523,300$13M1.27%+96,00013F-HR/ATimeline
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…513,106$12.8M<0.01%-25,70913F-HRTimelineGroup
Federation des caisses Desjardins du Qu…483,488$11.8M0.06%-66,27213F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc461,204$11.5M<0.01%+39,32213F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…449,550$11.2M0.03%+44,72713F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC434,044$10.8M<0.01%+191,84213F-HR/ATimelineGroup
UBS Group AGgroup of 2 filers holding418,626$10.4M-12,991Timeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/422,344$10.3M0.01%-71,25713F-HRTimelineGroup
Foresight Group Ltd Liability Partnersh…386,294$9.63M1.36%new13F-HR/ATimeline
Dixon Mitchell Investment Counsel Inc.356,125$8.88M0.4%+19,60013F-HRTimeline
CIBC WORLD MARKET INC.346,179$8.63M0.02%+9,97713F-HRTimeline
Heathbridge Capital Management Ltd.323,300$8.07M3.28%-5,70013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY301,687$7.52M<0.01%-10,13313F-HRTimelineGroup
Front Street Capital Management, Inc.288,962$7.2M1.37%+8,13213F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …251,058$6.26M0.01%-32,80013F-HRTimelineGroup
Select Equity Group, L.P.242,640$6.05M0.03%new13F-HRTimeline
Lombard Odier Asset Management (Europe)…114,315$5.9M0.47%+48,47813F-HRTimeline
Van Berkom & Associates Inc.231,789$5.78M0.19%-3,77613F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co200,610$5M<0.01%+2,20813F-HR/ATimelineGroup
SCOTIA CAPITAL INC.196,261$4.79M0.03%+4,45813F-HRTimeline
Swiss National Bank162,300$4.05M<0.01%-2,20013F-HRTimeline
Granite Investment Partners, LLC157,681$3.93M0.2%+14,19513F-HRTimeline
JARISLOWSKY, FRASER Ltd137,520$3.43M0.02%+2,98513F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC126,293$3.15M<0.01%+16,37213F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …123,055$3.08M<0.01%-514,33013F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC122,765$3.06M0.11%-7,71113F-HRTimeline
ROYCE & ASSOCIATES LP120,500$3M0.03%+45,00013F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP116,706$2.91M<0.01%+13,20913F-HRTimelineGroup
Waratah Capital Advisors Ltd.107,175$2.67M0.18%new13F-HRTimeline
CIBC Asset Management Inc103,378$2.58M0.01%-219,33513F-HRTimeline
NATIXIS ADVISORS, LLCin group Natixis Investment Managers86,147$2.15M<0.01%-8,28313F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…80,236$2M<0.01%+14,77813F-HRTimelineGroup
Nuveen, LLCin group TIAA66,106$1.65M<0.01%13F-HRTimelineGroup
Caldwell Investment Management Ltd.60,800$1.57M1.16%+12,70013F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK60,576$1.51M<0.01%+4,81613F-HRTimelineGroup
Aviso Financial Inc.50,201$1.25M0.06%+4,52013F-HRTimeline
BRITISH COLUMBIA INVESTMENT MANAGEMENT …46,871$1.17M0.01%-420,00813F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC43,250$1.09M<0.01%+2,19613F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP43,573$1.09M<0.01%+6,11013F-HRTimelineGroup
Onex Canada Asset Management Inc.43,299$1.08M0.14%-14,94913F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC42,085$1.05M<0.01%+9,63613F-HR/ATimelineGroup
Ewing Morris & Co. Investment Partners …28,280$1.01M0.32%013F-HRTimeline
Amundiin group Amundi30,538$770K<0.01%+1,56213F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.30,900$770K<0.01%-1,40013F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…29,771$742K<0.01%+3,39613F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…23,128$576K<0.01%013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC21,800$543K<0.01%+4,21713F-HR/ATimelineGroup
BANK OF NOVA SCOTIA TRUST COin group BANK OF NOVA SCOTIA17,713$442K0.05%+2,37213F-HRTimelineGroup
Caption Management, LLC17,607$439K0.02%new13F-HRTimeline
Mariner, LLCin group Mariner, LLC17,400$434K<0.01%+8,07213F-HRTimelineGroup
Nebula Research & Development LLC14,704$367K0.03%+3,62313F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…14,099$351K<0.01%-77613F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.14,000$349K<0.01%-1,021,52413F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN13,677$341K<0.01%+1,40213F-HRTimelineGroup
Aberdeen Group plcin group Aberdeen Group plc13,336$332K<0.01%+6913F-HRTimelineGroup
Dynasty Wealth Management, LLC12,934$322K0.01%+19613F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…12,715$317K0.01%+10,54413F-HRTimelineGroup
Cresset Asset Management, LLC12,464$311K<0.01%-3,24013F-HRTimeline
TRUE Private Wealth Advisors12,080$301K0.04%013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp11,241$280K<0.01%+813F-HRTimelineGroup
Procyon Advisors, LLC11,084$276K0.02%+1,45613F-HRTimeline
Engineers Gate Manager LP10,459$261K<0.01%+1,46913F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.8,821$220K<0.01%+5713F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
CITIGROUP INCin group CITIGROUP INC8,459$211K<0.01%-41013F-HRTimelineGroup
Northwest & Ethical Investments L.P.8,333$208K0.01%+1,80613F-HRTimeline
CIDEL ASSET MANAGEMENT INC8,286$207K0.01%+65013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\7,619$190K<0.01%+29913F-HRTimelineGroup
STEPH & CO5,317$133K0.05%+3,67413F-HRTimeline
SHELL ASSET MANAGEMENT CO4,331$108K0.01%-40013F-HRTimeline
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP3,815$95K<0.01%+1,33213F-HRTimelineGroup
State of Wyoming705$17.6K<0.01%-20013F-HRTimeline
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise691$17K<0.01%13F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\641$16K<0.01%-1,46413F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.591$14.7K<0.01%-4613F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO314$7.83K<0.01%-14213F-HRTimelineGroup
Geneos Wealth Management Inc.171$4.26K<0.01%+11413F-HRTimeline
COLDSTREAM CAPITAL MANAGEMENT INC62$1.55K<0.01%new13F-HRTimeline
Caitong International Asset Management …48$1.2K<0.01%new13F-HRTimeline
SALEM INVESTMENT COUNSELORS INC47$1.17K<0.01%013F-HRTimeline
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…46$1.15K<0.01%+3113F-HRTimelineGroup
Pacer Advisors, Inc.45$1.12K<0.01%013F-HRTimeline
Washington Trust Advisors, Inc.43$1.07K<0.01%-13213F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP38$985<0.01%-4013F-HR/ATimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…25$623<0.01%+813F-HRTimelineGroup
Leonteq Securities AG4$143<0.01%-17313F-HRTimeline
Bogart Wealth, LLC1$25<0.01%-6213F-HRTimeline
CONCOURSE FINANCIAL GROUP SECURITIES, I…0$0013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.

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