Free · no sign-up · Q2 2026

Which funds own MTRN

Materion Corp in the Q2 2026 filings. At least 4 of the 91 current managers on file reported a position, worth $94m 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: 4; at least, of 91 current
Combined value: $94m; as reported
Opened: 1; new this quarter
Added to: 1; already held
Trimmed or sold out: 3; 1 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	$54m	0.5%	180,940	+$26m-10,300	Trimmed
First Eagle Investment Management LLC Value · $60.8bn book	$36m	0.1%	119,300	+$21m+17,350	Added
PDT Partners LLC Quantitative · $1.9bn book	$4.7m	0.2%	15,931	opened15,931	New
ARK Investment Management LLC Long-only · $15.4bn book	$100k	0.0%	455	+$100k-116	Trimmed

Sold out of this quarter

Valued at what the position was worth in the previous filing, because by this one it is gone.

Capital World Investors · Long-only$60m held before

Ownership through time

At least 7 of the 95 managers whose filings are on file listed MTRN in Q2 2026, against 1 in Q2 2013. 1 manager more than in Q1 2026: 1 started a position; 1 listed it again; 1 sold out, by its own filing.

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

PDT Partners LLC$4.7m

Largest increases, by shares

Capital Research Global Investors789,873 to 1,000,456 shares+$63m
First Eagle Investment Management LLC101,950 to 119,300 shares+$5.2m
PDT Partners LLCnew: 15,931 shares+$4.7m

Largest decreases, by shares

Soros Fund Management LLC21,142 to 1,437 shares-$5.9m
GAMCO Investors Inc191,240 to 180,940 shares-$3.1m
ARK Investment Management LLC571 to 455 shares-$34k

Left it

Capital World Investorswas $60m

Manager	First listed	Largest	Q2 2026
Capital Research Global Investors	Q3 2022	$298m	$298m
GAMCO Investors Inc	Q2 2013	$54m	$54m
First Eagle Investment Management LLC	Q3 2025	$35m	$35m
Acadian Asset Management LLC	Q3 2016	$47m	$15m
PDT Partners LLC	Q4 2014	$4.7m	$4.7m
Soros Fund Management LLC	Q1 2026	$3.1m	$427k
ARK Investment Management LLC	Q3 2024	$135k	$135k
Capital World Investors	Q1 2026	$60m	last listed Q1 2026
Man Group PLC	Q1 2018	$13m	last listed Q2 2018
Arrowstreet Capital LP	Q1 2018	$7.5m	last listed Q1 2018
Winton Group Ltd	Q4 2017	$6.4m	last listed Q2 2019
Squarepoint Ops LLC	Q3 2019	$5.1m	last listed Q3 2019
Tudor Investment Corp	Q3 2019	$2.9m	last listed Q1 2022
Caxton Associates LLP	Q3 2025	$1.2m	last listed Q4 2025
Quantbot Technologies LP	Q3 2020	$288k	last listed Q3 2020

What MTRN 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 MTRN →

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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