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Which funds own OSIS

Osi Systems Inc in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $7.6m 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: $7.6m; 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
PDT Partners LLC Quantitative · $1.9bn book	$7.6m	0.4%	34,904	-$3.5m-7,200	Trimmed

Ownership through time

At least 5 of the 95 managers whose filings are on file listed OSIS in Q2 2026, against 2 in Q4 2013. The same number as in Q1 2026: 1 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

Janus Henderson Group Ltd772,314 to 905,925 shares+$29m
First Eagle Investment Management LLC24,662 to 52,162 shares+$6.0m
Neuberger Berman Group LLC303,923 to 324,715 shares+$4.5m

Largest decreases, by shares

PDT Partners LLC42,104 to 34,904 shares-$1.6m

Left it

No manager on file is shown leaving it.

Manager	First listed	Largest	Q2 2026
Janus Henderson Group Ltd	Q2 2017	$249m	$198m
Neuberger Berman Group LLC	Q3 2017	$81m	$71m
First Eagle Investment Management LLC	Q4 2024	$11m	$11m
PDT Partners LLC	Q4 2014	$11m	$7.6m
Winton Group Ltd	Q1 2019	$7.2m	$1.6m
Fidelity (FMR LLC)	Q1 2026	$522m	last listed Q1 2026
AllianceBernstein LP	Q4 2019	$65m	last listed Q1 2020
Arrowstreet Capital LP	Q3 2019	$35m	last listed Q4 2019
Marshall Wace LLP	Q3 2019	$28m	last listed Q1 2024
MFS Investment Management	Q4 2018	$22m	last listed Q4 2018
Two Sigma Advisers LP	Q1 2014	$5.4m	last listed Q1 2015
Voloridge Investment Management LLC	Q2 2019	$5.0m	last listed Q4 2019
Engaged Capital LLC	Q4 2013	$4.3m	last listed Q1 2014
Holocene Advisors LP	Q1 2018	$2.5m	last listed Q4 2019
Quantbot Technologies LP	Q4 2017	$2.3m	last listed Q2 2025

What OSIS 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 OSIS →

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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