Ats ATS Institutional Ownership

NYSE ATS

$18.05 -0.23 (-1.26%)

At close: Sep 30, 2026 · 4:00 PM EDT

Institutions by Trading Activity

144 Institutions

Increased 83 57.6%

Unchanged 15 10.4%

Reduced 46 31.9%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

83.63%

▼-8.91 pp QoQ

Shares Held by Institutions

81.87Mn

of 97.90Mn outstanding

▼-4.03% QoQ

Shares Outstanding

97.90Mn

16.02Mn held outside 13F filers

Institutional Investors

144

filed 13F for Jun 2026

▲+13 vs prior quarter

Net Shares Added (QoQ)

-3.44Mn

distributed since last quarter

Value of Holdings

$1.48Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

ATS Corp /ATS (NYSE:ATS) appears in 144 institutional 13F filings for the quarter ending June 2026.

These investors collectively held 83.6% of Ats's outstanding shares in June 2026, down from 92.5% in March 2026.
They decreased total shares held in ATS by -4.03% quarter over quarter, and investors in Ats increased 9.92% from a year ago.
Activity in ATS broke down as 83 buyers, 46 sellers, and 15 unchanged among 144 total holders.
The aggregate institutional position in Ats amounted to 81.87Mn shares as of June 2026, down by 3.44Mn shares quarter on quarter, and down 4.79Mn shares year over year.
MASON CAPITAL MANAGEMENT LLC holds the largest position in ATS at 16.4Mn shares as of June 30, 2026, or 16.76% of shares outstanding.
Top purchasers of ATS stock for the quarter ending June 2026 included Jupiter Topco LLC (2.32Mn), NORGES BANK (1.08Mn), FMR LLC (627.98K), Langdon Equity Partners (600.0K), Legal & General Group Plc (444.72K).
Top sellers of ATS stock for the quarter ending June 2026 included Turtle Creek Asset Management Inc. (7.3Mn), Connor, Clark & Lunn Investment Management Ltd. (1.18Mn), Beutel, Goodman & Co Ltd. (657.83K), FIL Ltd (451.33K), TD ASSET MANAGEMENT INC (418.86K).
Ats's 10 largest shareholders as of June 2026 include MASON CAPITAL MANAGEMENT LLC (16.4Mn), Royal Bank Of Canada (7.88Mn), EdgePoint Investment Group Inc. (7.0Mn), Beutel, Goodman & Co Ltd. (4.8Mn), Turtle Creek Asset Management Inc. (3.08Mn), Bank Of Montreal /Can/ (3.06Mn), FMR LLC (2.91Mn), Fairfax Financial Holdings Ltd/ Can (2.49Mn), VANGUARD CAPITAL MANAGEMENT LLC (2.4Mn), Jupiter Topco LLC (2.32Mn) per Business Quant data.

Form 13F Holdings

143 Institutional Holders

Report period 30 Jun, 2026

Total shares held 81.87Mn

Of outstanding 83.63%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	MASON CAPITAL MANAGEMENT LLC	0001218735	16,404,170	16.76%	0	0.00%	$472.11Mn
2	Royal Bank Of Canada	0001000275	7,881,423	8.05%	▲119,585	+1.54%	$226.83Mn
3	EdgePoint Investment Group Inc.	0001481669	7,004,577	7.16%	▼163,535	-2.28%	$201.70Mn
4	Beutel, Goodman & Co Ltd.	0001361974	4,796,922	4.90%	▼657,827	-12.06%	$138.22K
5	Turtle Creek Asset Management Inc.	0001484148	3,084,567	3.15%	▼7,301,252	-70.30%	$88.77Mn
6	Bank Of Montreal /Can/	0000927971	3,062,973	3.13%	▼52,387	-1.68%	$88.20Mn
7	FMR LLC	0000315066	2,905,456	2.97%	▲627,984	+27.57%	$83.75Mn
8	Fairfax Financial Holdings Ltd/ Can	0000915191	2,486,400	2.54%	0	0.00%	$70.49Mn
9	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	2,398,431	2.45%	▲31,701	+1.34%	$69.13Mn
10	Jupiter Topco LLC	0002146052	2,322,073	2.37%	▲2,322,073	0.00%	$66.91Mn
11	TD Waterhouse Canada Inc.	0001999606	1,683,683	1.72%	▲49,234	+3.01%	$47.43Mn
12	Hill City Capital, LP	0001837343	1,649,857	1.69%	0	0.00%	$47.48Mn
13	ACK Asset Management LLC	0001510940	1,500,000	1.53%	▼346,196	-18.75%	$43.17Mn
14	FIL Ltd	0000318989	1,326,851	1.36%	▼451,330	-25.38%	$38.24Mn
15	Alberta Investment Management Corp	0001463559	1,177,491	1.20%	▲237,300	+25.24%	$33.90Mn
16	Scheer, Rowlett & Associates Investment Management Ltd.	0001426327	1,175,268	1.20%	▼6,669	-0.56%	$33.84Mn
17	Bank Of America Corp /De/	0000070858	1,122,152	1.15%	▲176,277	+18.64%	$32.30Mn
18	Connor, Clark & Lunn Investment Management Ltd.	0001596800	1,089,460	1.11%	▼1,175,297	-51.90%	$31.37Mn
19	NORGES BANK	0001374170	1,084,181	1.11%	▲1,084,181	0.00%	$31.22Mn
20	Clearbridge Investments, LLC	0001348883	1,060,487	1.08%	▼30,804	-2.82%	$30.52Mn

Showing 1 to 20 of 143 holders