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Which funds own OTTR

Otter Tail Corp in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $24m 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: $24m; 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	$24m	0.2%	264,798	+$600k-2	Trimmed

Ownership through time

At least 4 of the 95 managers whose filings are on file listed OTTR in Q2 2026, against 2 in Q2 2013. 1 manager fewer than in Q1 2026: 1 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, 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

No manager on file started a position.

Largest increases, by shares

Two Sigma Investments LP662,934 to 725,769 shares+$5.7m
PDT Partners LLC20,600 to 27,000 shares+$576k
Winton Group Ltd14,621 to 19,946 shares+$479k

Largest decreases, by shares

No manager on file sold part of it.

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
Two Sigma Investments LP	Q1 2026	$65m	$65m
GAMCO Investors Inc	Q2 2013	$25m	$24m
PDT Partners LLC	Q1 2026	$2.4m	$2.4m
Winton Group Ltd	Q1 2023	$1.8m	$1.8m
Renaissance Technologies LLC	Q3 2018	$47m	last listed Q1 2020
Two Sigma Advisers LP	Q4 2025	$13m	last listed Q4 2025
Acadian Asset Management LLC	Q3 2013	$12m	last listed Q4 2022
Tudor Investment Corp	Q2 2013	$9.8m	last listed Q4 2024
Schonfeld Strategic Advisors LLC	Q1 2019	$5.7m	last listed Q1 2025
ExodusPoint Capital Management LP	Q1 2024	$5.2m	last listed Q3 2024
Quantbot Technologies LP	Q2 2020	$2.6m	last listed Q1 2026
Caxton Associates LLP	Q1 2022	$512k	last listed Q1 2022
Holocene Advisors LP	Q4 2018	$412k	last listed Q4 2018

What OTTR 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 OTTR →

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

One email a week on what moved in the market and what it means for the people interviewing into it, with the 13F changes the quarter they are filed.

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