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Disclosery

ATS ATS CORPORATION

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COM (common), issuer CIK 1394832

129 managers (132 13F filers) reported a position in ATS shares at 2025-06-30, 86,800,688 shares in all. 21 filers opened a position and 12 filers sold out during the quarter.

Managers
129
13F filers
132
New
21
Added
48
Reduced
51
Sold out
12
Shares held by filers
86,800,688

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 2025

Filers in the available 13F reports with a share position at 2025-06-30, 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 LLC15,563,568$496M97%013F-HRTimeline
TURTLE CREEK ASSET MANAGEMENT INC.7,590,538$242M7.02%-710,99013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA7,074,621$226M0.04%+594,45313F-HR/ATimelineGroup
Beutel, Goodman & Co Ltd.6,834,488$218M1.24%-217,83613F-HRTimeline
EdgePoint Investment Group Inc.6,434,005$205M1.55%+1,416,00913F-HRTimeline
VANGUARD GROUP INCgroup of 2 filers holding3,279,417$105M+58,845Timeline
FAIRFAX FINANCIAL HOLDINGS LTD/ CANin group FAIRFAX FINANCIAL HOLDINGS LT…2,486,400$79.1M4.23%013F-HRTimelineGroup
Connor, Clark & Lunn Investment Managem…2,369,028$75.6M0.27%+392,87413F-HRTimeline
Franklin Resourcesgroup of 2 filers holding1,864,142$59.4M+246,608Timeline
ACK Asset Management LLC1,846,196$58.9M7.73%-167,00013F-HRTimeline
Burgundy Asset Management Ltd.1,812,147$57.7M0.56%+43,36513F-HRTimeline
TD Waterhouse Canada Inc.1,452,320$46.4M0.33%-220,77613F-HRTimeline
MACKENZIE FINANCIAL CORP1,410,833$45M0.06%+210,57013F-HRTimeline
FMR LLCin group FMR LLC1,405,012$44.8M<0.01%-81,63113F-HRTimelineGroup
TD Asset Management Inc1,278,879$40.7M0.03%+122,01713F-HRTimeline
Marathon Asset Management Ltd1,234,961$39.3M1.26%new13F-HRTimeline
Hill City Capital, LP1,224,857$39M2.1%-75,00013F-HRTimeline
Capital World Investors1,196,000$38.1M0.01%013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.1,188,227$37.9M0.01%-213,85813F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…1,112,974$35.4M0.07%+1,17413F-HRTimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/1,098,424$35.1M0.02%+52,85713F-HRTimelineGroup
NORGES BANK1,027,456$32.8M<0.01%013F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson922,164$29.4M0.01%013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/861,833$27.5M<0.01%-194,13113F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…841,502$26.9M0.05%+200,30013F-HRTimeline
1832 Asset Management L.P.824,558$26.3M0.05%-20,49413F-HRTimeline
Scheer, Rowlett & Associates Investment…792,305$25.3M1.64%+159,81413F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC783,440$24.9M0.01%+86,60013F-HRTimelineGroup
Alberta Investment Management Corp767,600$24.5M0.19%-198,52713F-HR/ATimeline
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…631,114$20.1M0.01%+118,00813F-HRTimelineGroup
MOORE CAPITAL MANAGEMENT, LP611,120$19.5M0.39%-111,36213F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC556,575$17.7M<0.01%+122,53113F-HRTimelineGroup
AGF MANAGEMENT LTDin group AGF MANAGEMENT LTD489,956$15.6M0.07%-51,77413F-HRTimelineGroup
Galibier Capital Management Ltd.486,375$15.5M4.65%-320,62213F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/439,018$14M0.02%+16,67413F-HR/ATimelineGroup
Legal & General Group Plcin group Legal & General Group Plc438,440$14M<0.01%-22,76413F-HRTimelineGroup
Dixon Mitchell Investment Counsel Inc.402,125$12.8M0.5%+46,00013F-HRTimeline
Foresight Group Ltd Liability Partnersh…381,812$12.2M1.72%-4,48213F-HRTimeline
JARISLOWSKY, FRASER Ltd379,208$12.1M0.07%+241,68813F-HRTimeline
CIBC WORLD MARKET INC.369,726$11.8M0.03%+23,54713F-HRTimeline
UBS Group AGgroup of 2 filers holding338,180$10.8M-80,446Timeline
MONTRUSCO BOLTON INVESTMENTS INC.318,781$10.1M0.11%new13F-HRTimeline
VAN LANSCHOT KEMPEN INVESTMENT MANAGEME…225,582$9.8M0.09%new13F-HRTimeline
Front Street Capital Management, Inc.293,985$9.37M1.8%+5,02313F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT279,805$8.89M0.13%new13F-HRTimeline
Van Berkom & Associates Inc.269,260$8.57M0.26%+37,47113F-HRTimeline
Federation des caisses Desjardins du Qu…266,968$8.51M0.04%-216,52013F-HRTimeline
SCOTIA CAPITAL INC.203,774$6.49M0.03%+7,51313F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co200,237$6.37M<0.01%-37313F-HRTimelineGroup
Swiss National Bank160,100$5.09M<0.01%-2,20013F-HRTimeline
Granite Investment Partners, LLC153,040$4.88M0.24%-4,64113F-HRTimeline
Fiera Capital Corpin group Fiera Capital Corp132,369$4.22M0.01%-590,74213F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY130,873$4.17M<0.01%-170,81413F-HRTimelineGroup
ROYCE & ASSOCIATES LP125,500$4M0.04%+5,00013F-HRTimeline
Lombard Odier Asset Management (Europe)…122,148$3.9M0.28%+7,83313F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP120,088$3.83M<0.01%+3,38213F-HRTimelineGroup
Waratah Capital Advisors Ltd.118,480$3.78M0.26%+11,30513F-HRTimeline
LOUISBOURG INVESTMENTS INC.101,522$3.23M0.76%new13F-HRTimeline
NATIXIS ADVISORS, LLCin group Natixis Investment Managers98,912$3.15M0.01%+12,76513F-HRTimelineGroup
Canoe Financial LP81,114$2.59M0.04%-532,18513F-HRTimeline
CIBC Asset Management Inc79,703$2.54M0.01%-23,67513F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP77,062$2.46M<0.01%+33,48913F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …63,161$2M<0.01%-59,89413F-HRTimelineGroup
Nuveen, LLCin group TIAA62,584$1.99M<0.01%-3,52213F-HRTimelineGroup
Caldwell Investment Management Ltd.60,800$1.94M1.68%013F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.58,572$1.87M<0.01%+27,67213F-HRTimelineGroup
Aviso Financial Inc.50,653$1.62M0.07%+45213F-HRTimeline
BRITISH COLUMBIA INVESTMENT MANAGEMENT …50,516$1.61M0.01%+3,64513F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC45,855$1.47M<0.01%+2,60513F-HRTimelineGroup
TORONTO DOMINION BANKin group TORONTO DOMINION BANK43,240$1.38M<0.01%-17,33613F-HRTimelineGroup
Lombard Odier Asset Management (Switzer…39,572$1.26M0.06%new13F-HRTimeline
FIL Ltdin group FIL Ltd35,436$1.13M<0.01%-780,99113F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC32,225$1.03M<0.01%-9,86013F-HRTimelineGroup
Ewing Morris & Co. Investment Partners …31,600$1.01M0.45%+3,32013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…29,859$950K<0.01%-50,37713F-HRTimelineGroup
Northwest & Ethical Investments L.P.29,543$941K0.02%+21,21013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…28,880$920K<0.01%-420,67013F-HR/ATimelineGroup
Trexquant Investment LP28,803$918K0.01%new13F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…28,082$895K<0.01%new13F-HRTimelineGroup
Amundiin group Amundi27,180$888K<0.01%-3,35813F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…27,279$868K<0.01%+4,15113F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…27,152$864K<0.01%-2,61913F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC26,092$832K<0.01%new13F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC22,790$726K<0.01%-103,50313F-HRTimelineGroup
BANK OF NOVA SCOTIA TRUST COin group BANK OF NOVA SCOTIA21,802$695K0.07%+4,08913F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC21,628$690K<0.01%-17213F-HR/ATimelineGroup
Onex Canada Asset Management Inc.19,053$608K0.07%-24,24613F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc16,205$517K<0.01%+2,86913F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC15,640$499K<0.01%-1,76013F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.14,000$446K<0.01%013F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…13,873$442K<0.01%-22613F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC12,610$401K<0.01%+4,15113F-HRTimelineGroup
TRUE Private Wealth Advisors12,080$385K0.04%013F-HRTimeline
Nebula Research & Development LLC11,283$360K0.03%-3,42113F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd10,941$349K0.01%new13F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp10,774$343K<0.01%-46713F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\9,965$318K<0.01%+2,34613F-HRTimelineGroup
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP9,371$299K<0.01%new13F-HRTimelineGroup
CIDEL ASSET MANAGEMENT INC9,270$295K0.02%+98413F-HRTimeline
Engineers Gate Manager LP8,990$287K<0.01%-1,46913F-HRTimeline
Dynamic Technology Lab Private Ltd8,810$281K0.04%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…8,812$281K0.01%-3,90313F-HRTimelineGroup
HANTZ FINANCIAL SERVICES, INC.8,292$264K<0.01%-52913F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
SkyView Investment Advisors, LLC7,449$237K0.03%new13F-HRTimeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC6,885$219K<0.01%new13F-HR/ATimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC6,674$213K0.01%-116,09113F-HRTimeline
Cresset Asset Management, LLC6,466$206K<0.01%-5,99813F-HR/ATimeline
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP5,130$164K<0.01%+1,31513F-HRTimelineGroup
SHELL ASSET MANAGEMENT CO4,331$138K<0.01%013F-HRTimeline
SIMPLEX TRADING, LLC3,630$115K<0.01%new13F-HRTimeline
STEPH & CO2,000$63.8K0.02%-3,31713F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC1,348$43K<0.01%new13F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.644$20.5K<0.01%+5313F-HR/ATimelineGroup
Caitong International Asset Management …493$15.7K0.01%+44513F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO354$11.3K<0.01%+4013F-HRTimelineGroup
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise360$11K<0.01%-33113F-HRTimelineGroup
Washington Trust Advisors, Inc.178$5.67K<0.01%+13513F-HRTimeline
Allworth Financial LP120$3.83K<0.01%new13F-HRTimeline
Pacer Advisors, Inc.93$2.96K<0.01%+4813F-HRTimeline
WealthCollab, LLC89$2.84K<0.01%new13F-HRTimeline
Brooklyn Investment Group85$2.71K<0.01%new13F-HR/ATimeline
Geneos Wealth Management Inc.57$1.82K<0.01%-11413F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP54$1.72K<0.01%+1613F-HRTimelineGroup
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…46$1.47K<0.01%013F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\38$1.21K<0.01%-60313F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…20$638<0.01%-513F-HRTimelineGroup
Bell Investment Advisors, Inc20$638<0.01%new13F-HRTimeline
Leonteq Securities AG4$175<0.01%013F-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