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Which funds own GATX

Gatx Corp in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $187m between them. It is among the largest positions of fewer than a fifth of the current managers on file. Buying and selling roughly cancelled this quarter, which is what a name looks like when the argument is still live.

Managers holding: 1; at least, of 91 current
Combined value: $187m; as reported
Opened: 0; new this quarter
Added to: 0; already held
Trimmed or sold out: 1; 0 sold out entirely

Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.

Managers reporting a position

Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.

Manager	Value	Weight	Shares	Change on the quarter	Action
GAMCO Investors Inc Activist · $11.1bn book	$187m	1.7%	1,054,962	-$1.1m-46,011	Trimmed

Ownership through time

At least 7 of the 95 managers whose filings are on file listed GATX in Q2 2026, against 3 in Q2 2013. The same number as in Q1 2026: 2 started positions; 2 no longer listed it among the positions read, which can mean a holding below the listed range or a filing not yet made.

Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.

Managers on file listing it

Their combined reported value

Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.

Started in Q2 2026

Hudson Bay Capital Management LP$7.1m
Freestone Grove Partners LP$1.5m

Largest increases, by shares

Hudson Bay Capital Management LPnew: 40,178 shares+$7.1m
Freestone Grove Partners LPnew: 8,524 shares+$1.5m
Quantbot Technologies LP12,174 to 18,685 shares+$1.2m
AllianceBernstein LP580,189 to 581,469 shares+$219k

Largest decreases, by shares

GAMCO Investors Inc1,100,973 to 1,054,962 shares-$8.2m
Tudor Investment Corp181,928 to 154,990 shares-$4.8m
Walleye Capital LLC131,764 to 122,415 shares-$1.7m

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
GAMCO Investors Inc	Q2 2013	$234m	$187m
AllianceBernstein LP	Q3 2020	$138m	$99m
Tudor Investment Corp	Q2 2013	$31m	$27m
Walleye Capital LLC	Q2 2025	$25m	$22m
Hudson Bay Capital Management LP	Q2 2026	$7.1m	$7.1m
Quantbot Technologies LP	Q2 2022	$3.3m	$3.3m
Freestone Grove Partners LP	Q2 2026	$1.5m	$1.5m
Wellington Management Group LLP	Q2 2013	$231m	last listed Q1 2026
Janus Henderson Group Ltd	Q2 2018	$114m	last listed Q1 2025
AQR Capital Management LLC	Q1 2017	$38m	last listed Q4 2018
Millennium Management LLC	Q4 2014	$27m	last listed Q4 2014
Steadfast Capital Management LP	Q3 2025	$24m	last listed Q3 2025
Winton Group Ltd	Q3 2014	$23m	last listed Q4 2020
Schonfeld Strategic Advisors LLC	Q4 2017	$18m	last listed Q3 2025
Voloridge Investment Management LLC	Q4 2016	$13m	last listed Q1 2025
Balyasny Asset Management LLC	Q4 2014	$12m	last listed Q4 2014
Two Sigma Advisers LP	Q1 2024	$11m	last listed Q1 2024

What GATX is worth

Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.

Build the comp set around GATX →

How much of the picture this is

A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.

What to do with a name the funds are buying

Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.

Comps ExplorerValue it against the peers it trades beside Every managerRead any of these books in full Deal tapeWhat buyers paid for whole companies, not slices Hedge fund interviewsHow the room runs, and the stock pitch it wants

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The holdings, every quarter, and the week between

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