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Which funds own IRON

Disc Medicine Inc in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $70m 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: $70m; 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
Woodline Partners LP Long/short equity · $32.4bn book	$70m	0.2%	958,281	+$8.8m0	Held

Ownership through time

At least 4 of the 95 managers whose filings are on file listed IRON in Q2 2026, against 2 in Q2 2023. 1 manager more than in Q1 2026: 2 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

Started in Q2 2026

No manager on file started a position.

Added to it

Cut it

No manager on file cut it.

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
Wellington Management Group LLP	Q1 2025	$127m	$127m
Woodline Partners LP	Q2 2023	$76m	$70m
Moore Capital Management LP	Q1 2026	$4.2m	$4.2m
Brevan Howard Capital Management LP	Q4 2025	$3.9m	$3.7m
Janus Henderson Group Ltd	Q4 2023	$82m	last listed Q2 2025
Point72 Asset Management LP	Q2 2024	$37m	last listed Q3 2024
Artisan Partners LP	Q1 2024	$6.8m	last listed Q3 2024
Hudson Bay Capital Management LP	Q3 2023	$6.8m	last listed Q3 2025
ExodusPoint Capital Management LP	Q3 2024	$4.6m	last listed Q4 2025
Freestone Grove Partners LP	Q1 2026	$4.4m	last listed Q1 2026
Davidson Kempner Capital Management LP	Q2 2023	$4.0m	last listed Q2 2023
PDT Partners LLC	Q2 2024	$1.6m	last listed Q4 2024

What IRON 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 IRON →

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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