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Disclosery

ATS ATS CORPORATION

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COM (common), issuer CIK 1394832

114 managers (115 13F filers) reported a position in ATS shares at 2025-09-30, 83,527,331 shares in all. 15 filers opened a position and 31 filers sold out during the quarter.

Managers
114
13F filers
115
New
15
Added
41
Reduced
45
Sold out
31
Shares held by filers
83,527,331

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, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, 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$408M82.99%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA7,201,778$189M0.03%+127,15713F-HRTimelineGroup
TURTLE CREEK ASSET MANAGEMENT INC.6,973,010$183M5.51%-617,52813F-HRTimeline
EdgePoint Investment Group Inc.6,381,294$167M1.25%-52,71113F-HRTimeline
Beutel, Goodman & Co Ltd.6,330,688$166M1%-503,80013F-HRTimeline
VANGUARD GROUP INCgroup of 2 filers holding3,341,435$87.4M+62,018Timeline
FAIRFAX FINANCIAL HOLDINGS LTD/ CANin group FAIRFAX FINANCIAL HOLDINGS LT…2,486,400$64.1M3.11%013F-HRTimelineGroup
Connor, Clark & Lunn Investment Managem…2,053,472$53.7M0.17%-315,55613F-HRTimeline
Burgundy Asset Management Ltd.1,807,557$50M0.47%-4,59013F-HRTimeline
ACK Asset Management LLC1,846,196$48.4M6.05%013F-HRTimeline
Hill City Capital, LP1,649,857$43.2M1.83%+425,00013F-HRTimeline
TD Waterhouse Canada Inc.1,430,232$37.4M0.24%-22,08813F-HRTimeline
FMR LLCin group FMR LLC1,375,587$36M<0.01%-29,42513F-HRTimelineGroup
Alberta Investment Management Corp1,340,265$35.1M0.25%+572,66513F-HR/ATimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/1,251,695$32.8M<0.01%+389,86213F-HR/ATimelineGroup
Scheer, Rowlett & Associates Investment…1,217,184$31.8M1.9%+424,87913F-HRTimeline
Invesco Ltd.in group Invesco Ltd.1,196,732$31.4M<0.01%+8,50513F-HRTimelineGroup
TD Asset Management Inc1,181,762$30.9M0.03%-97,11713F-HRTimeline
Marathon Asset Management Ltd1,166,007$30.5M1.12%-68,95413F-HRTimeline
Franklin Resourcesgroup of 2 filers holding1,146,211$30M-717,931Timeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/1,142,653$29.9M0.01%+44,22913F-HRTimelineGroup
MACKENZIE FINANCIAL CORP1,138,559$29.8M0.04%-272,27413F-HRTimeline
VAN LANSCHOT KEMPEN INVESTMENT MANAGEME…815,678$29.7M0.27%+590,09613F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…1,109,230$29M0.05%-3,74413F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson898,343$23.5M0.01%-23,82113F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC874,140$22.9M0.01%+90,70013F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…753,492$19.7M0.04%-88,01013F-HRTimeline
1832 Asset Management L.P.738,731$19.4M0.03%-85,82713F-HRTimeline
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…569,674$14.9M<0.01%-61,44013F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC507,885$13.3M<0.01%-48,69013F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc494,609$13M<0.01%+56,16913F-HRTimelineGroup
AGF MANAGEMENT LTDin group AGF MANAGEMENT LTD489,956$12.8M0.06%013F-HRTimelineGroup
Galibier Capital Management Ltd.447,446$11.7M3.9%-38,92913F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/420,025$10.8M0.01%-18,99313F-HRTimelineGroup
Foresight Group Ltd Liability Partnersh…388,892$10.2M1.52%+7,08013F-HRTimeline
CIBC WORLD MARKET INC.369,513$9.67M0.02%-21313F-HRTimeline
JARISLOWSKY, FRASER Ltd334,904$8.76M0.05%-44,30413F-HRTimeline
Front Street Capital Management, Inc.289,772$7.59M1.17%-4,21313F-HRTimeline
MONTRUSCO BOLTON INVESTMENTS INC.283,781$7.43M0.09%-35,00013F-HRTimeline
Van Berkom & Associates Inc.269,994$7.06M0.2%+73413F-HRTimeline
UBS Group AGgroup of 2 filers holding231,595$6.07M-106,585Timeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co230,506$6.03M<0.01%+30,26913F-HRTimelineGroup
Roubaix Capital, LLC223,532$5.86M2.73%new13F-HRTimeline
Dixon Mitchell Investment Counsel Inc.218,525$5.72M0.2%-183,60013F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.217,900$5.7M<0.01%+159,32813F-HRTimelineGroup
LOUISBOURG INVESTMENTS INC.215,295$5.63M1.23%+113,77313F-HRTimeline
Granite Investment Partners, LLC205,847$5.39M0.31%+52,80713F-HRTimeline
SCOTIA CAPITAL INC.209,018$5.38M0.02%+5,24413F-HRTimeline
Federation des caisses Desjardins du Qu…195,234$5.04M0.02%-71,73413F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth181,988$4.77M0.01%new13F-HRTimelineGroup
Swiss National Bank160,100$4.19M<0.01%013F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP148,712$3.89M<0.01%+28,62413F-HRTimelineGroup
CIBC Asset Management Inc134,854$3.52M0.01%+55,15113F-HRTimeline
ROYCE & ASSOCIATES LP134,500$3.52M0.04%+9,00013F-HRTimeline
Fiera Capital Corpin group Fiera Capital Corp93,159$2.44M0.01%-39,21013F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…91,611$2.4M0.01%+64,33213F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP89,223$2.34M<0.01%+12,16113F-HRTimelineGroup
Canoe Financial LP78,877$2.06M0.03%-2,23713F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK77,955$2.05M<0.01%+34,71513F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …76,460$2M<0.01%+13,29913F-HRTimelineGroup
Bastion Asset Management Inc.72,655$1.9M1.1%new13F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC69,820$1.83M<0.01%+43,72813F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY69,639$1.82M<0.01%-61,23413F-HR/ATimelineGroup
Nuveen, LLCin group TIAA62,584$1.64M<0.01%013F-HRTimelineGroup
Public Sector Pension Investment Board61,906$1.62M0.01%new13F-HRTimeline
Caldwell Investment Management Ltd.60,800$1.6M1.05%013F-HRTimeline
Aviso Financial Inc.52,243$1.37M0.06%+1,59013F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC50,232$1.32M<0.01%+4,37713F-HRTimelineGroup
Blackstone Inc.in group Blackstone Inc.49,501$1.3M0.01%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
BRITISH COLUMBIA INVESTMENT MANAGEMENT …47,806$1.25M0.01%-2,71013F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC43,821$1.15M<0.01%new13F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…33,085$866K<0.01%+3,22613F-HRTimelineGroup
Main Management ETF Advisors, LLCin group Main Management ETF Advisors,…29,450$772K0.03%new13F-HRTimelineGroup
Lombard Odier Asset Management (Switzer…21,515$771K0.03%-18,05713F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…28,731$752K<0.01%-14913F-HRTimelineGroup
Amundiin group Amundi27,180$727K<0.01%013F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…27,205$712K<0.01%+5313F-HRTimeline
BANK OF NOVA SCOTIA TRUST COin group BANK OF NOVA SCOTIA25,075$657K0.06%+3,27313F-HRTimelineGroup
PenderFund Capital Management Ltd.20,000$523K0.09%new13F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc18,595$489K<0.01%+2,39013F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC17,794$466K<0.01%-4,99613F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC16,442$430K<0.01%+3,83213F-HRTimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…15,538$407K<0.01%+1,66513F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd13,621$357K0.02%+2,68013F-HRTimelineGroup
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP12,126$318K<0.01%+2,75513F-HRTimelineGroup
TRUE Private Wealth Advisors12,080$316K0.03%013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\10,888$285K<0.01%+92313F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC10,170$266K0.01%+3,49613F-HRTimeline
ALLIANCEBERNSTEIN L.P.9,820$257K<0.01%-4,18013F-HRTimeline
Mariner, LLCin group Mariner, LLC9,024$236K<0.01%-6,61613F-HRTimelineGroup
Northwest & Ethical Investments L.P.8,613$225K0.01%-20,93013F-HRTimeline
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP6,012$158K<0.01%+88213F-HRTimelineGroup
Quantbot Technologies LP4,665$122K<0.01%new13F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC4,508$118K<0.01%-17,12013F-HR/ATimelineGroup
State of Wyoming4,262$112K0.01%new13F-HRTimeline
SHELL ASSET MANAGEMENT CO1,302$34K<0.01%-3,02913F-HRTimeline
Quarry LP1,238$32.4K0.01%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,000$26.2K<0.01%-7,81213F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO714$18.7K<0.01%+36013F-HR/ATimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.621$17.2K<0.01%-2313F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN632$16.6K<0.01%new13F-HRTimelineGroup
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise360$9K<0.01%013F-HRTimelineGroup
Farther Finance Advisors, LLC243$6.37K<0.01%new13F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.173$5K<0.01%-8,11913F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Caitong International Asset Management …143$3.75K<0.01%-35013F-HRTimeline
Pacer Advisors, Inc.99$2.59K<0.01%+613F-HRTimeline
WealthCollab, LLC89$2.33K<0.01%013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP49$1.26K<0.01%-513F-HRTimelineGroup
Root Financial Partners, LLC40$1.05K<0.01%new13F-HRTimeline
SIMPLEX TRADING, LLC67$1K<0.01%-3,56313F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…20$524<0.01%013F-HRTimelineGroup
Bell Investment Advisors, Inc20$524<0.01%013F-HRTimeline
Larson Financial Group LLC13$341<0.01%new13F-HRTimeline
Leonteq Securities AG4$146<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