ATS · ATS Corp /ATS · Holdings

$19.20 +0.17 (+0.89%) At close · Sep 11

Market Cap

$1.88B

98.13M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 140

Total Value: $2,355,673,197

Total Shares: 81,851,052

Showing 1–100 of 143 holdings by value · page 1 of 2

Institutional Ownership Trend

15 quarters

Superinvestors Holding ATS

All superinvestors →

Prem Watsa $71,558,592 Joel Greenblatt $241,608

Holder Concentration

Across 140 13F filers · Δ vs Mar 31, 2026

Top Holder

20.0%

+0.8 pts

Top 5

47.9%

−1.1 pts

Top 10

64.0%

+0.2 pts

HHI

706

Broadly held+16

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +9

Institutional value: -1.9%

Shares held: -3.8%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega FMR LLC	+627,984	2,905,456
Mega Legal & General Group Plc	+444,719	1,056,408
Large TORONTO DOMINION BANK	+387,441	480,616
Mid Alberta Investment Management Corp	+237,300	1,177,491
Mega NATIONAL BANK OF CANADA /FI/	+207,034	855,316

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mid TURTLE CREEK ASSET MANAGEMENT INC.	−1,812,102	3,084,567
Large Connor, Clark & Lunn Investment Management Ltd.	−1,175,297	1,089,460
Large Beutel, Goodman & Co Ltd.	−657,827	4,796,922
Mega FIL Ltd	−451,330	1,326,851
Mega TD Asset Management Inc	−418,863	1,003,596

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega Jupiter Topco LLC	2,322,073	$66,829,260
Mega NORGES BANK	1,084,181	$31,202,729
Small Langdon Equity Partners	600,000	$17,268,000
Small Roubaix Capital, LLC	246,909	$7,106,041
Small NewGen Asset Management Ltd	150,000	$4,317,000

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega JANUS HENDERSON GROUP PLC	2,297,214	$64,781,434
Large Vinva Investment Management Ltd	2,088,947	$58,908,305
Mega PRINCIPAL FINANCIAL GROUP INC	620,840	$17,507,688
Large ROYCE & ASSOCIATES LP	179,500	$5,061,900
Mega D. E. Shaw & Co., Inc.	30,200	$851,640

Filter: New 25 Increased 56 Reduced 44 Sold out 16 Unchanged 15

Showing 100 of 143

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

MASON CAPITAL MANAGEMENT LLC

$472,112,012

20.04%

16,404,170

ROYAL BANK OF CANADA

$226,827,351

9.63%

7,881,423

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC Global Asset Management Inc.	6,696,693	$192,730,824	85.0%	Defined
RBC Dominion Securities Inc.	1,115,180	$32,094,880	14.1%	Defined
RBC Phillips, Hager & North Investment Counsel Inc.	59,862	$1,722,828	0.8%	Defined
RBC Private Counsel (USA) Inc.	5,970	$171,816	0.1%	Defined
ROYAL TRUST CORP OF CANADA/	2,410	$69,359	0.0%	Defined
Held directly	1,308	$37,644	0.0%	Defined

EdgePoint Investment Group Inc.

$201,591,726

8.56%

7,004,577

Beutel, Goodman & Co Ltd.

$138,055,415

5.86%

4,796,922

TURTLE CREEK ASSET MANAGEMENT INC.

$88,773,838

3.77%

3,084,567

BANK OF MONTREAL /CAN/

$88,152,362

3.74%

3,062,973

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BMO Asset Management Inc.	334,713	$9,633,040	10.9%	Defined
BMO NESBITT BURNS INC.	750,951	$21,612,369	24.5%	Defined
Burgundy Asset Management Ltd.	1,977,309	$56,906,953	64.6%	Defined

FMR LLC

$83,619,023

3.55%

2,905,456

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	2,876,525	$82,786,389	99.0%	Defined
FIAM LLC	28,931	$832,634	1.0%	Defined

FAIRFAX FINANCIAL HOLDINGS LTD/ CAN

$71,558,592

3.04%

2,486,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
HAMBLIN WATSA INVESTMENT COUNSEL LTD joint	2,486,400	$71,558,592	100.0%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$69,026,844

2.93%

2,398,431

Jupiter Topco LLC

$66,829,260

2.84%

2,322,073

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JANUS HENDERSON INVESTORS US LLC	2,301,708	$66,243,156	99.1%	Defined
Held directly	20,365	$586,104	0.9%	Defined

TD Waterhouse Canada Inc.

$48,456,396

2.06%

1,683,683

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TORONTO DOMINION BANK	1,683,683	$48,456,396	100.0%	Defined

Hill City Capital, LP

$47,482,884

2.02%

1,649,857

ACK Asset Management LLC

$43,170,000

1.83%

1,500,000

FIL Ltd

$38,186,771

1.62%

1,326,851

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FIL Investments International	42,267	$1,216,444	3.2%	Defined
Fidelity Investments Canada ULC	1,284,584	$36,970,327	96.8%	Defined

Alberta Investment Management Corp

$33,888,190

1.44%

1,177,491

Scheer, Rowlett & Associates Investment Management Ltd.

$33,824,213

1.44%

1,175,268

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	1,175,268	$33,824,213	100.0%	Sole

BANK OF AMERICA CORP /DE/

$32,295,532

1.37%

1,122,152

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	15,763	$453,659	1.4%	Defined
BOFA SECURITIES, INC.	56,044	$1,612,946	5.0%	Defined
MERRILL LYNCH CANADA INC.	301,110	$8,665,945	26.8%	Defined
MANAGED ACCOUNT ADVISORS LLC joint	749,235	$21,562,982	66.8%	Defined

Connor, Clark & Lunn Investment Management Ltd.

$31,354,658

1.33%

1,089,460

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	1,089,460	$31,354,658	100.0%	Sole

NORGES BANK

$31,202,729

1.32%

1,084,181

Clearbridge Investments, LLC

$30,520,815

1.30%

1,060,487

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FRANKLIN TEMPLETON INVESTMENTS CORP	1,060,487	$30,520,815	100.0%	Defined

Legal & General Group Plc

$30,403,421

1.29%

1,056,408

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	2,890	$83,174	0.3%	Defined
Legal & General Investment Management Ltd joint	1,053,518	$30,320,247	99.7%	Defined

TD Asset Management Inc

$28,883,492

1.23%

1,003,596

Marathon Asset Management Ltd

$27,470,078

1.17%

954,485

NATIONAL BANK OF CANADA /FI/

$24,615,992

1.04%

855,316

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
National Bank Financial Inc.	807,453	$23,238,497	94.4%	Defined
Manager 6	352	$10,130	0.0%	Defined
Manager 7	20,169	$580,463	2.4%	Defined
Held directly	27,342	$786,902	3.2%	Defined

VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V.

$22,897,914

0.97%

795,619

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$22,701,203

0.96%

788,784

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	788,784	$22,701,203	100.0%	Defined

VANGUARD FIDUCIARY TRUST CO

$20,844,519

0.88%

724,271

Langdon Equity Partners

$17,268,000

0.73%

600,000

MASSACHUSETTS FINANCIAL SERVICES CO /MA/

$15,562,295

0.66%

540,733

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MFS INVESTMENT MANAGEMENT CANADA LTD	540,733	$15,562,295	100.0%	Defined

MACKENZIE FINANCIAL CORP

$15,102,995

0.64%

524,774

TORONTO DOMINION BANK

$11,711,042

0.50%

406,916

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES INC	8,308	$239,104	2.0%	Defined
Canada Trust Co	29,695	$854,622	7.3%	Defined
Held directly	368,913	$10,617,316	90.7%	Sole

Public Sector Pension Investment Board

$10,878,868

0.46%

378,001

1832 Asset Management L.P.

$10,238,341

0.43%

355,745

Waratah Capital Advisors Ltd.

$9,639,083

0.41%

334,923

CIBC WORLD MARKET INC.

$9,413,563

0.40%

327,087

ArrowMark Colorado Holdings LLC

$8,058,400

0.34%

280,000

Vanguard Global Advisers, LLC

$7,888,684

0.33%

274,103

Roubaix Capital, LLC

$7,106,041

0.30%

246,909

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$7,008,649

0.30%

243,525

MORGAN STANLEY

$6,741,308

0.29%

234,236

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	23	$661	0.0%	Defined
MORGAN STANLEY & CO. LLC	16,200	$466,236	6.9%	Defined
Morgan Stanley Canada LTD	203,243	$5,849,333	86.8%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	11,337	$326,278	4.8%	Defined
MORGAN STANLEY SMITH BARNEY LLC	3,255	$93,678	1.4%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	12	$345	0.0%	Defined
Calvert Research & Management	166	$4,777	0.1%	Defined

GOLDMAN SACHS GROUP INC

$6,439,869

0.27%

223,762

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	165,096	$4,751,462	73.8%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	58,666	$1,688,407	26.2%	Defined

UBS Group AG

$6,405,074

0.27%

222,553

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	528	$15,195	0.2%	Defined
UBS AG	218,525	$6,289,149	98.2%	Defined
UBS Switzerland AG	3,500	$100,730	1.6%	Defined

SCOTIA CAPITAL INC.

$6,122,052

0.26%

212,719

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF NOVA SCOTIA	212,719	$6,122,052	100.0%	Defined

Dixon Mitchell Investment Counsel Inc.

$6,073,299

0.26%

211,025

JANE STREET GROUP, LLC

$5,745,495

0.24%

199,635

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	25,567	$735,818	12.8%	Defined
Jane Street Global Trading, LLC	174,068	$5,009,677	87.2%	Defined

Granite Investment Partners, LLC

$5,637,829

0.24%

195,894

Van Berkom & Associates Inc.

$5,412,539

0.23%

188,066

Focus Partners Wealth

$5,237,240

0.22%

181,975

FIRST TRUST ADVISORS LP

$5,226,217

0.22%

181,592

Swiss National Bank

$4,835,040

0.21%

168,000

DIMENSIONAL FUND ADVISORS LP

$4,810,547

0.20%

167,149

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	1,800	$51,804	1.1%	Defined
DFA Australia Ltd.	9,626	$277,036	5.8%	Defined
Dimensional Ireland Ltd	19,783	$569,354	11.8%	Defined
Held directly	135,940	$3,912,353	81.3%	Sole

Candelo Capital Management LP

$4,751,578

0.20%

165,100

SIG North Trading, ULC

$4,622,068

0.20%

160,600

Delaney Capital Management Ltd.

$4,616,081

0.20%

160,392

NewGen Asset Management Ltd

$4,317,000

0.18%

150,000

CIBC Asset Management Inc

$3,978,719

0.17%

138,246

Front Street Capital Management, Inc.

$3,596,722

0.15%

124,973

HARBOR CAPITAL ADVISORS, INC.

$3,315,398

0.14%

115,198

LOUISBOURG INVESTMENTS INC.

$3,197,573

0.14%

111,104

Polar Asset Management Partners Inc.

$3,027,742

0.13%

105,203

BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp

$2,922,493

0.12%

101,546

K.J. Harrison & Partners Inc

$2,878,000

0.12%

100,000

MONTRUSCO BOLTON INVESTMENTS INC.

$2,850,831

0.12%

99,056

SEI INVESTMENTS CO

$2,802,481

0.12%

97,376

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI TRUST CO	97,376	$2,802,481	100.0%	Sole

PCJ Investment Counsel Ltd.

$2,464,719

0.10%

85,640

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	85,640	$2,464,719	100.0%	Sole

LAZARD ASSET MANAGEMENT LLC

$2,390,236

0.10%

83,052

Canoe Financial LP

$2,389,430

0.10%

83,024

HALLSTATT ADVISORS L.P.

$2,389,315

0.10%

83,020

CITADEL ADVISORS LLC

$2,368,823

0.10%

82,308

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	38,133	$1,097,467	46.3%	Defined
Held directly	44,175	$1,271,356	53.7%	Defined

TORONTO DOMINION BANK

$2,121,086

0.09%

73,700

MANUFACTURERS LIFE INSURANCE COMPANY, THE

$2,119,762

0.09%

73,654

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MANULIFE FINANCIAL CORP joint	73,654	$2,119,762	100.0%	Defined

GEODE CAPITAL MANAGEMENT, LLC

$2,003,030

0.09%

69,598

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	14,489	$416,993	20.8%	Defined
Held directly	55,109	$1,586,037	79.2%	Defined

VANGUARD ASSET MANAGEMENT, Ltd

$1,923,367

0.08%

66,830

CenterBook Partners LP

$1,875,880

0.08%

65,180

Nuveen, LLC

$1,801,167

0.08%

62,584

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TIAA CREF INVESTMENT MANAGEMENT LLC joint	62,584	$1,801,167	100.0%	Defined

Caldwell Investment Management Ltd.

$1,749,824

0.07%

60,800

BOOTHBAY FUND MANAGEMENT, LLC

$1,722,972

0.07%

59,867

Federation des caisses Desjardins du Quebec

$1,581,374

0.07%

54,947

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Desjardins Securities inc.	43,281	$1,245,627	78.8%	Defined
Regime de rentes du Mouvement Desjardins	8,500	$244,630	15.5%	Defined
Held directly	3,166	$91,117	5.8%	Defined

Zurcher Kantonalbank (Zurich Cantonalbank)

$1,564,509

0.07%

54,361

VAN ECK ASSOCIATES CORP

$1,338,471

0.06%

46,507

GUARDIAN CAPITAL LP

$1,336,341

0.06%

46,433

INTACT INVESTMENT MANAGEMENT INC.

$1,165,273

0.05%

40,489

Aviso Financial Inc.

$1,154,394

0.05%

40,111

PenderFund Capital Management Ltd.

$1,085,006

0.05%

37,700

CITIGROUP INC

$1,054,815

0.04%

36,651

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	36,651	$1,054,815	100.0%	Defined

BANK OF NOVA SCOTIA TRUST CO

$1,015,674

0.04%

35,291

XTX Topco Ltd

$1,007,674

0.04%

35,013

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	35,013	$1,007,674	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$1,001,284

0.04%

34,791

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	34,791	$1,001,284	100.0%	Other

AMERICAN CENTURY COMPANIES INC

$935,350

0.04%

32,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	32,500	$935,350	100.0%	Defined

Engineers Gate Manager LP

$902,627

0.04%

31,363

Verition Fund Management LLC

$849,384

0.04%

29,513

PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO

$816,373

0.03%

28,366

SIG North Trading, ULC

$791,450

0.03%

27,500

FRANKLIN RESOURCES INC

$731,356

0.03%

25,412

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FRANKLIN ADVISERS INC	12,663	$364,441	49.8%	Defined
FRANKLIN ADVISORY SERVICES LLC	4,033	$116,069	15.9%	Defined
FRANKLIN TEMPLETON INVESTMENTS CORP	8,716	$250,846	34.3%	Defined

Squarepoint Ops LLC

$712,592

0.03%

24,760

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	24,760	$712,592	100.0%	Defined

SIG North Trading, ULC

$649,708

0.03%

22,575

ExodusPoint Capital Management, LP

$636,038

0.03%

22,100

Vanguard Investments Australia, Ltd.

$629,533

0.03%

21,874

WELLS FARGO & COMPANY/MN

$568,346

0.02%

19,748

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	342	$9,842	1.7%	Defined
WELLS FARGO CLEARING SERVICES, LLC	19,406	$558,504	98.3%	Defined

BARCLAYS PLC

$483,906

0.02%

16,814

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	16,814	$483,906	100.0%	Defined

Key facts CIK 1394832 CUSIP 00217Y104 13F (30d) 51 filings 49 filers Visit website Investor relations