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ATS Corporation (ATS) institutional ownership

Latest close $26.97 Jul 28, 2026
Market cap$2.7B 52-week range SectorIndustrials
Funds holding · Q1 2026
116
reported ATS position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
62 buyers · 54 sellers

ATS Corporation (ATS) price and institutional activity

Dates

Q1 2026

$0 bought by 62 investors
Vinva Investment Management LtdFil Ltd +60 more
$0 sold by 54 investors
NorgesInvesco Ltd. +52 more
Bought Sold Totals per quarter; hover a bar for the names.

ATS Corporation (ATS) institutional activity · 54

Investor Type Est. change Change Δ Own Date
Norges · Exited
Change −1.1M Δ Own −100.0% Date Q1 2026
Norges Exited· Q1 2026 −1.1M −100.0% Q1 2026
Invesco Ltd. · Reduced
Change −929K Δ Own −73.0% Date Q1 2026
Invesco Ltd. Reduced· Q1 2026 −929K −73.0% Q1 2026
Healthcare of Ontario Pension Plan Trust Fund · Exited
Change −753K Δ Own −100.0% Date Q1 2026
Healthcare of Ontario Pension Plan Trust Fund Exited· Q1 2026 −753K −100.0% Q1 2026
Turtle Creek Asset Management Inc. · Reduced
Change −745K Date Q1 2026
Turtle Creek Asset Management Inc. Reduced· Q1 2026 −745K Q1 2026
1832 Asset Management L.P. · Reduced
Change −417K Date Q1 2026
1832 Asset Management L.P. Reduced· Q1 2026 −417K Q1 2026
Agf Management Ltd · Exited
Change −400K Δ Own −100.0% Date Q1 2026
Agf Management Ltd Exited· Q1 2026 −400K −100.0% Q1 2026
Alberta Investment Management Corp · Reduced
Change −400K Date Q1 2026
Alberta Investment Management Corp Reduced· Q1 2026 −400K Q1 2026
Mirae Asset Global Etfs Holdings Ltd. · Reduced
Change −384K Date Q1 2026
Mirae Asset Global Etfs Holdings Ltd. Reduced· Q1 2026 −384K Q1 2026
Beutel, Goodman & Co Ltd. · Reduced
Change −382K Date Q1 2026
Beutel, Goodman & Co Ltd. Reduced· Q1 2026 −382K Q1 2026
Principal Financial Group Inc · Reduced
Change −257K Date Q1 2026
Principal Financial Group Inc Reduced· Q1 2026 −257K Q1 2026
Goldman Sachs Group Inc · Reduced
Change −233K Date Q1 2026
Goldman Sachs Group Inc Reduced· Q1 2026 −233K Q1 2026
Connor, Clark & Lunn Investment Management Ltd. · Reduced
Change −221K Date Q1 2026
Connor, Clark & Lunn Investment Management Ltd. Reduced· Q1 2026 −221K Q1 2026
Polar Asset Management Partners Inc. · Exited
Change −180K Δ Own −100.0% Date Q1 2026
Polar Asset Management Partners Inc. Exited· Q1 2026 −180K −100.0% Q1 2026
Bank of America Corp · Reduced
Change −155K Date Q1 2026
Bank of America Corp Reduced· Q1 2026 −155K Q1 2026
Mackenzie Financial Corp · Reduced
Change −142K Date Q1 2026
Mackenzie Financial Corp Reduced· Q1 2026 −142K Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 54

Famous investor activity in ATS Corporation (ATS)

ATS Corporation (ATS) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Mason Capital Management LLC 14.9M
% of shares outstanding 15.2% Filing date Nov 13, 2024
Mason Capital Management LLC 14.9M 15.2% Nov 13, 2024
Turtle Creek Asset Management Inc. 4.9M
% of shares outstanding 5.0% Filing date May 15, 2026
Turtle Creek Asset Management Inc. 4.9M 5.0% May 15, 2026
Capital International Investors 5K
% of shares outstanding 0.0% Filing date Nov 13, 2024
Capital International Investors 5K 0.0% Nov 13, 2024
3 of 3

ATS Corporation (ATS) ownership FAQ

Who owns ATS?

116 reporting institutions disclosed ATS position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.