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Disclosery

ATS ATS CORPORATION

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COM (common), issuer CIK 1394832

121 managers (122 13F filers) reported a position in ATS shares at 2025-12-31, 83,164,737 shares in all. 21 filers opened a position and 13 filers sold out during the quarter.

Managers
121
13F filers
122
New
21
Added
41
Reduced
42
Sold out
13
Shares held by filers
83,164,737

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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$429M76.32%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA7,644,547$211M0.04%+442,76913F-HRTimelineGroup
EdgePoint Investment Group Inc.6,888,785$190M1.56%+507,49113F-HRTimeline
Beutel, Goodman & Co Ltd.5,837,138$161M0.99%-493,55013F-HRTimeline
TURTLE CREEK ASSET MANAGEMENT INC.5,642,052$155M6.84%-1,330,95813F-HRTimeline
VANGUARD GROUP INCin group VANGUARD GROUP INC3,397,166$93.6M<0.01%+55,73113F-HRTimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/3,022,693$83.3M0.03%+1,880,04013F-HRTimelineGroup
Connor, Clark & Lunn Investment Managem…2,485,638$68.5M0.18%+432,16613F-HRTimeline
FAIRFAX FINANCIAL HOLDINGS LTD/ CANin group FAIRFAX FINANCIAL HOLDINGS LT…2,486,400$68.3M3.28%013F-HRTimelineGroup
FMR LLCin group FMR LLC2,117,766$58.3M<0.01%+742,17913F-HRTimelineGroup
ACK Asset Management LLC1,846,196$50.8M6.38%013F-HRTimeline
Hill City Capital, LP1,649,857$45.4M1.72%013F-HRTimeline
Alberta Investment Management Corp1,340,265$36.9M0.22%013F-HR/ATimeline
Invesco Ltd.in group Invesco Ltd.1,272,222$35M<0.01%+75,49013F-HRTimelineGroup
Scheer, Rowlett & Associates Investment…1,226,450$33.8M2.32%+9,26613F-HRTimeline
TD Asset Management Inc1,193,208$32.9M0.03%+11,44613F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…1,141,835$31.5M0.05%+32,60513F-HRTimelineGroup
Franklin Resourcesgroup of 2 filers holding1,136,871$31.3M-9,340Timeline
VAN LANSCHOT KEMPEN INVESTMENT MANAGEME…815,031$30.8M0.26%-64713F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/1,100,381$30.3M<0.01%-151,31413F-HRTimelineGroup
Marathon Asset Management Ltd1,097,711$30.3M1.16%-68,29613F-HRTimeline
NORGES BANK1,079,090$29.7M<0.01%new13F-HRTimeline
TD Waterhouse Canada Inc.966,349$26.5M0.16%-463,88313F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC878,240$24.2M0.01%+4,10013F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson861,839$23.8M0.01%-36,50413F-HRTimelineGroup
1832 Asset Management L.P.818,559$22.5M0.03%+79,82813F-HRTimeline
MACKENZIE FINANCIAL CORP758,980$21.1M0.02%-379,57913F-HRTimeline
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…753,492$20.8M0.04%013F-HRTimeline
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…558,675$15.4M<0.01%-10,99913F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc542,023$14.9M<0.01%+47,41413F-HRTimelineGroup
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/418,332$11.5M0.01%-1,69313F-HRTimelineGroup
AGF MANAGEMENT LTDin group AGF MANAGEMENT LTD400,140$11M0.05%-89,81613F-HRTimelineGroup
CIBC WORLD MARKET INC.354,069$9.75M0.02%-15,44413F-HRTimeline
Public Sector Pension Investment Board287,829$7.93M0.03%+225,92313F-HRTimeline
Front Street Capital Management, Inc.286,994$7.9M1.12%-2,77813F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC285,377$7.86M<0.01%-222,50813F-HR/ATimelineGroup
Van Berkom & Associates Inc.269,136$7.42M0.21%-85813F-HRTimeline
MONTRUSCO BOLTON INVESTMENTS INC.254,681$7.02M0.09%-29,10013F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co236,332$6.52M<0.01%+5,82613F-HRTimelineGroup
UBS Group AGin group UBS Group AG228,774$6.3M<0.01%-2,82113F-HRTimelineGroup
Dixon Mitchell Investment Counsel Inc.211,025$5.82M0.19%-7,50013F-HRTimeline
LOUISBOURG INVESTMENTS INC.207,130$5.71M1.14%-8,16513F-HRTimeline
Granite Investment Partners, LLC203,876$5.61M0.33%-1,97113F-HRTimeline
SCOTIA CAPITAL INC.195,019$5.35M0.02%-13,99913F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP184,128$5.07M<0.01%+35,41613F-HRTimelineGroup
Focus Partners Wealthin group Focus Partners Wealth181,975$5.01M0.01%-1313F-HRTimelineGroup
Polar Asset Management Partners Inc.180,000$4.96M0.1%new13F-HRTimeline
Swiss National Bank164,400$4.54M<0.01%+4,30013F-HRTimeline
ROYCE & ASSOCIATES LP164,500$4.53M0.05%+30,00013F-HRTimeline
Delaney Capital Management Ltd.153,037$4.22M0.7%13F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC148,840$4.1M<0.01%+79,02013F-HRTimelineGroup
CIBC Asset Management Inc131,500$3.62M0.01%-3,35413F-HRTimeline
Federation des caisses Desjardins du Qu…116,404$3.2M0.01%-78,83013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP110,342$3.04M<0.01%+21,11913F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.108,100$2.98M<0.01%-109,80013F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO98,742$2.72M<0.01%new13F-HRTimelineGroup
TORONTO DOMINION BANKin group TORONTO DOMINION BANK81,910$2.26M<0.01%+3,95513F-HRTimelineGroup
Canoe Financial LP80,600$2.22M0.03%+1,72313F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …76,426$2.11M<0.01%-3413F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC75,879$2.09M<0.01%+32,05813F-HRTimelineGroup
AYAL Capital Advisors Ltd72,200$1.99M1.09%new13F-HRTimeline
Fiera Capital Corpin group Fiera Capital Corp71,007$1.96M0.01%-22,15213F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…64,639$1.78M<0.01%-26,97213F-HRTimeline
Nuveen, LLCin group TIAA62,584$1.73M<0.01%013F-HRTimelineGroup
Caldwell Investment Management Ltd.60,800$1.69M1.04%013F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC59,255$1.67M<0.01%+9,02313F-HRTimelineGroup
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC58,426$1.61M<0.01%new13F-HRTimelineGroup
FIL Ltdin group FIL Ltd53,569$1.47M<0.01%new13F-HRTimelineGroup
Aviso Financial Inc.51,725$1.42M0.05%-51813F-HRTimeline
GUARDIAN CAPITAL LPin group GUARDIAN CAPITAL LP47,063$1.3M0.04%new13F-HRTimelineGroup
BRITISH COLUMBIA INVESTMENT MANAGEMENT …43,753$1.21M0.01%-4,05313F-HRTimeline
BANK OF NOVA SCOTIA TRUST COin group BANK OF NOVA SCOTIA30,514$840K0.07%+5,43913F-HRTimelineGroup
Main Management ETF Advisors, LLCin group Main Management ETF Advisors,…29,754$819K0.03%+30413F-HRTimelineGroup
SIG North Trading, ULC29,342$808K0.14%new13F-HRTimeline
Purpose Unlimited Inc.in group Purpose Unlimited Inc.28,802$793K0.04%13F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…27,215$751K<0.01%+1013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC25,149$694K<0.01%+8,70713F-HRTimelineGroup
Candelo Capital Management LP24,700$680K0.62%new13F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC22,063$608K<0.01%new13F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY21,491$592K<0.01%-48,14813F-HR/ATimelineGroup
Aberdeen Group plcin group Aberdeen Group plc20,007$551K<0.01%+1,41213F-HRTimelineGroup
PenderFund Capital Management Ltd.20,000$551K0.09%013F-HRTimeline
Numerai GP LLC16,305$449K0.05%new13F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…16,006$442K<0.01%+46813F-HRTimelineGroup
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP13,571$374K<0.01%+7,55913F-HRTimelineGroup
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP12,593$347K<0.01%+46713F-HRTimelineGroup
Third View Private Wealth, LLC12,264$338K0.05%13F-HRTimeline
Mariner, LLCin group Mariner, LLC12,167$335K<0.01%+3,14313F-HRTimelineGroup
TRUE Private Wealth Advisors12,080$333K0.03%013F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC11,372$313K<0.01%new13F-HRTimelineGroup
SkyView Investment Advisors, LLC10,966$302K0.04%new13F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd10,640$293K0.01%-2,98113F-HRTimelineGroup
Northwest & Ethical Investments L.P.10,553$291K0.01%+1,94013F-HR/ATimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\10,261$283K<0.01%-62713F-HRTimelineGroup
Investment Management Corp of Ontario10,116$279K<0.01%new13F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…9,790$270K<0.01%-18,94113F-HR/ATimelineGroup
Verition Fund Management LLC9,192$253K<0.01%new13F-HRTimeline
ALLIANCEBERNSTEIN L.P.8,960$247K<0.01%-86013F-HRTimeline
Campbell & CO Investment Adviser LLC8,805$242K0.01%new13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…8,529$235K<0.01%-24,55613F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC7,634$210K<0.01%-10,16013F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC5,264$145K<0.01%+75613F-HRTimelineGroup
Smartleaf Asset Management LLC1,052$29.2K<0.01%new13F-HRTimeline
Blue Trust, Inc.733$20.2K<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN711$19.6K<0.01%+7913F-HRTimelineGroup
Hillsdale Investment Management Inc.600$16.6K<0.01%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO553$15.2K<0.01%-16113F-HRTimelineGroup
Farther Finance Advisors, LLC263$7.24K<0.01%+2013F-HRTimeline
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise261$7K<0.01%-9913F-HRTimelineGroup
HANTZ FINANCIAL SERVICES, INC.173$5K<0.01%013F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Pacer Advisors, Inc.137$3.77K<0.01%+3813F-HR/ATimeline
2UniFi Bank137$3.77K<0.01%new13F-HRTimeline
Larson Financial Group LLC121$3.33K<0.01%+10813F-HRTimeline
WealthCollab, LLC89$2.45K<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…69$1.9K<0.01%+4913F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.58$1.6K<0.01%new13F-HRTimelineGroup
Root Financial Partners, LLC40$1.1K<0.01%013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP36$991<0.01%-1313F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.30$826<0.01%-59113F-HRTimelineGroup
Bell Investment Advisors, Inc20$551<0.01%013F-HRTimeline
Leonteq Securities AG4$151<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