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Which funds own RIO

Rio Tinto ADR Reptg One PLC ADR in the Q2 2026 filings. At least 3 of the 91 current managers on file reported a position, worth $360m 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: 3; at least, of 91 current
Combined value: $360m; as reported
Opened: 0; new this quarter
Added to: 2; 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
Neuberger Berman Group LLC Long-only · $150bn book	$227m	0.2%	2,389,913	-$2.2m-64,989	Trimmed
Renaissance Technologies LLC Quantitative · $72.6bn book	$115m	0.2%	1,214,600	+$25m+248,800	Added
Farallon Capital Management LLC Long/short equity · $21.7bn book	$17m	0.1%	183,475	+$12m+129,675	Added

Ownership through time

At least 10 of the 95 managers whose filings are on file listed RIO in Q2 2026, against 5 in Q2 2013. 3 managers more than in Q1 2026: 3 started positions.

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

Largest increases, by shares

Tudor Investment Corpnew: 249,474 shares+$24m
Renaissance Technologies LLC965,800 to 1,214,600 shares+$24m
Hudson Bay Capital Management LPnew: 190,000 shares+$18m
Farallon Capital Management LLC53,800 to 183,475 shares+$12m
Quantbot Technologies LPnew: 16,594 shares+$1.6m

Largest decreases, by shares

Arrowstreet Capital LP3,710,224 to 1,715,018 shares-$189m
Neuberger Berman Group LLC2,454,902 to 2,389,913 shares-$6.2m
Bridgewater Associates LP114,239 to 72,797 shares-$3.9m
Baillie Gifford & Co590 to 524 shares-$6k

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
Neuberger Berman Group LLC	Q1 2017	$525m	$227m
Arrowstreet Capital LP	Q1 2017	$1.0bn	$163m
Renaissance Technologies LLC	Q2 2016	$115m	$115m
Tudor Investment Corp	Q4 2020	$24m	$24m
Hudson Bay Capital Management LP	Q2 2014	$18m	$18m
Farallon Capital Management LLC	Q1 2023	$17m	$17m
Bridgewater Associates LP	Q2 2013	$38m	$6.9m
Quantbot Technologies LP	Q4 2013	$4.2m	$1.6m
Dodge & Cox	Q2 2013	$1.5m	$285k
Baillie Gifford & Co	Q3 2014	$4.4m	$50k
Wellington Management Group LLP	Q4 2016	$1.8bn	last listed Q2 2025
Capital World Investors	Q4 2020	$682m	last listed Q2 2025
Acadian Asset Management LLC	Q2 2020	$265m	last listed Q1 2024
Citadel Advisors LLC	Q1 2019	$157m	last listed Q4 2023
Jane Street Group LLC	Q1 2014	$139m	last listed Q3 2020
Two Sigma Investments LP	Q2 2015	$119m	last listed Q3 2023
Two Sigma Advisers LP	Q4 2016	$104m	last listed Q3 2022
D. E. Shaw & Co.	Q1 2015	$83m	last listed Q2 2025
Holocene Advisors LP	Q3 2022	$82m	last listed Q3 2023
Marshall Wace LLP	Q4 2016	$72m	last listed Q3 2025

What RIO 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 RIO →

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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