Ats Institutional Ownership

NYSE ATS

$19.08 +0.38 (+2.03%)

As of: Oct 21, 2026 · 3:59 PM EDT

Institutions by Trading Activity

143 Institutions

Increased 82 57.3%

Unchanged 15 10.5%

Reduced 46 32.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

83.38%

▼-8.96 pp QoQ

Shares Held by Institutions

81.63Mn

of 97.90Mn outstanding

▼-9.90% QoQ

Shares Outstanding

97.90Mn

16.27Mn held outside 13F filers

Institutional Investors

143

filed 13F for Jun 2026

▲+12 vs prior quarter

Net Shares Added (QoQ)

-8.97Mn

distributed since last quarter

Value of Holdings

$1.53Bn

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

Updated Oct 11, 2026

ATS Corp (NYSE:ATS) was held by 143 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

Collectively, these holders controlled 83.38% of ATS's outstanding shares in Q2 2026, down from 92.35% in Q1 2026.
Total holdings of ATS shares fell 9.90% from Q1 2026, and the holder count rose 10.00% from Q2 2025.
Among the 143 holders of ATS, 82 added to their positions, 46 reduced their stakes and 15 left their positions unchanged.
Altogether, institutional holders owned 81.63Mn ATS shares at the end of Q2 2026, down 8.97Mn from the prior quarter and down 5.03Mn from a year earlier.
Mason Capital Management LLC was the top holder of ATS as of June 30, 2026, with 16.4Mn shares, or 16.76% of shares outstanding.
Among holders that already owned ATS, the biggest buyers in Q2 2026 were FMR LLC (+627.98K shares), Legal & General Group PLC (+444.72K shares), Toronto Dominion Bank (+313.74K shares), Alberta Investment Management Corp (+237.3K shares) and National Bank of Canada (+207.03K shares).
Among holders that kept a stake in ATS, the biggest sellers in Q2 2026 were Turtle Creek Asset Management Inc. (-7.3Mn shares), Connor, Clark & Lunn Investment Management Ltd. (-1.18Mn shares), Beutel, Goodman & Co Ltd. (-657.83K shares), FIL Ltd (-451.33K shares) and TD Asset Management Inc (-418.86K shares).
Business Quant data shows the 10 biggest positions in ATS as of Q2 2026 were held by Mason Capital Management LLC (16.4Mn shares), Royal Bank of Canada (7.88Mn shares), EdgePoint Investment Group Inc. (7Mn shares), Beutel, Goodman & Co Ltd. (4.8Mn shares), Turtle Creek Asset Management Inc. (3.08Mn shares), Bank of Montreal (3.06Mn shares), FMR LLC (2.91Mn shares), Fairfax Financial Holdings Ltd (2.49Mn shares), Vanguard Capital Management LLC (2.4Mn shares) and Jupiter Topco LLC (2.32Mn shares).

Form 13F Holdings

143 Institutional Holders

Report period 30 Jun, 2026

Total shares held 81.63Mn

Of outstanding 83.38%

#	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