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Which funds own WRB

Berkley W R Corp in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $4.3m 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: $4.3m; as reported
Opened: 0; new this quarter
Added to: 0; already held
Trimmed or sold out: 0; 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
Markel Group Inc Activist · $13.1bn book	$4.3m	0.0%	60,750	+$300k0	Held

Ownership through time

At least 11 of the 95 managers whose filings are on file listed WRB in Q2 2026, against 7 in Q2 2013. 3 managers more than in Q1 2026: 4 listed it again; 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

AQR Capital Management LLC1,848,105 to 3,680,160 shares+$129m
Arrowstreet Capital LP803,150 to 2,588,583 shares+$126m
Tudor Investment Corp426,345 to 571,238 shares+$10m

Largest decreases, by shares

Quantbot Technologies LP172,464 to 44,134 shares-$9.1m
Invesco Ltd5,051,765 to 5,028,284 shares-$1.7m
GAMCO Investors Inc91,219 to 90,834 shares-$27k

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
Invesco Ltd	Q1 2020	$375m	$355m
AQR Capital Management LLC	Q4 2017	$260m	$260m
Arrowstreet Capital LP	Q1 2017	$183m	$183m
Two Sigma Investments LP	Q2 2013	$142m	$142m
Squarepoint Ops LLC	Q1 2016	$53m	$53m
Tudor Investment Corp	Q2 2013	$40m	$40m
GAMCO Investors Inc	Q2 2013	$29m	$6.4m
ExodusPoint Capital Management LP	Q2 2019	$21m	$5.2m
Markel Group Inc	Q2 2017	$4.7m	$4.3m
Brevan Howard Capital Management LP	Q3 2024	$4.2m	$3.5m
Quantbot Technologies LP	Q4 2014	$11m	$3.1m
Janus Henderson Group Ltd	Q1 2018	$698m	last listed Q1 2026
First Eagle Investment Management LLC	Q2 2013	$564m	last listed Q2 2023
Balyasny Asset Management LLC	Q1 2016	$188m	last listed Q3 2025
Wellington Management Group LLP	Q1 2017	$187m	last listed Q3 2022
Millennium Management LLC	Q3 2015	$183m	last listed Q2 2023
Capital World Investors	Q2 2013	$161m	last listed Q1 2023
Citadel Advisors LLC	Q4 2015	$133m	last listed Q4 2020
Woodline Partners LP	Q1 2024	$84m	last listed Q2 2025
D. E. Shaw & Co.	Q1 2021	$83m	last listed Q2 2023
Point72 Asset Management LP	Q4 2016	$74m	last listed Q2 2023

What WRB 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 WRB →

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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