$ATS

$18.95 +$0.01 (0.05%) Close

$ATS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 98.1M shares outstanding

Who owns ATS?

By type of holder

Institutions 83.1% Everyone else 16.9%

No insider has reported a holding in the last two years, so insiders are counted in "Everyone else".

Concentration Top 10 holders own 53.3%

Mason Capital Management LLC 16.7% · Royal Bank Of Canada 8.0%

Institutional ownership

83.1%

-3.6 pts vs last qtr

Institutional holders

139

+8 vs last qtr

Net shares bought

−3.5M

by institutions in Q2 2026

New / sold out

24 / 16

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jupiter Topco LLC NEW +2.3M
Norges Bank NEW +1.1M

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −2.3M
Vinva Investment Management Ltd SOLD OUT −2.1M

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for ATS Corp in the last 12 months.

Is your stake being diluted?

There are not yet two fiscal years of reported share counts for ATS Corp.

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years77% 1–3 years13% Under 1 year11%

Quarterly turnover

11.8%

of institutional shares changed hands

Top 10 managers, median time held

3 years

Super Investors

Investment managers reporting ATS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
MC Mason Capital Management LLC	16.4M	16.72%	Unchanged	2023	77.8%
Shares held by quarter Peak holding16.4M (Q1'26) Change over 8 quarters+1.5M Share of the company16.720% Mason Capital Management LLC's full portfolio →
RB Royal Bank Of Canada	7.9M	8.03%	+119.6K (+1.5%)	2023	0.0%
Shares held by quarter Peak holding7.9M (Q2'26) Change over 8 quarters+4.0M Share of the company8.030% Royal Bank Of Canada's full portfolio →

Mason Capital Management LLC

16.4M

% of company

16.72%

Change vs last qtr

Unchanged

Held since

2023

Royal Bank Of Canada

7.9M

% of company

8.03%

Change vs last qtr

+119.6K (+1.5%)

Held since

2023

28 more super investors behind a free account

See every manager holding ATS Corp, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ATS on Form N-PORT; together they hold 12.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
FV Fidelity Value Fund Fidelity Capital Trust	$41.4M	1.5M	1.55%	0.39%	July 31, 2026
VT Vanguard Total International Stock Index Fund Vanguard Star Funds	$33M	1.2M	1.23%	0.01%	July 31, 2026

Fidelity Value Fund

Fidelity Capital Trust

Position value

$41.4M

% of company

1.55%

% of the fund

0.39%

As of

July 31, 2026

Vanguard Total International Stock Index Fund

Vanguard Star Funds

Position value

$33M

% of company

1.23%

% of the fund

0.01%

As of

July 31, 2026

23 more funds behind a free account

See every fund holding ATS Corp and how much of the fund the position is.

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