Free · no sign-up · Q2 2026

Which funds own RGEN

Repligen Corp in the Q2 2026 filings. At least 2 of the 91 current managers on file reported a position, worth $447m 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: 2; at least, of 91 current
Combined value: $447m; as reported
Opened: 0; new this quarter
Added to: 2; already held
Trimmed or sold out: 2; 2 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
Maverick Capital Ltd Long/short equity · $11.3bn book	$271m	2.4%	1,984,554	+$92m+465,749	Added
Holocene Advisors LP Long/short equity · $44.4bn book	$176m	0.4%	1,292,191	+$93m+583,302	Added

Sold out of this quarter

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

Artisan Partners LP · Long-only$22m held before
Oaktree Capital Management LP · Activist$8.8m held before

Ownership through time

At least 10 of the 95 managers whose filings are on file listed RGEN in Q2 2026, against 1 in Q3 2013. 1 manager more than in Q1 2026: 2 started positions; 2 listed it again; 1 sold out, by its own filing; 2 no longer listed it among the positions read, which can mean a holding below the listed range 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

Marshall Wace LLP$38m
Moore Capital Management LP$5.1m

Largest increases, by shares

Holocene Advisors LP708,889 to 1,292,191 shares+$80m
Maverick Capital Ltd1,518,805 to 1,984,554 shares+$64m
Marshall Wace LLPnew: 282,107 shares+$38m
MFS Investment Management1,397,515 to 1,617,021 shares+$30m
Moore Capital Management LPnew: 37,549 shares+$5.1m

Largest decreases, by shares

T. Rowe Price Associates Inc4,878,141 to 1,752,274 shares-$426m
Hudson Bay Capital Management LP92,500 to 60,000 shares-$4.4m
AllianceBernstein LP831,792 to 795,282 shares-$4.3m

Left it

Artisan Partners LPwas $22m

Manager	First listed	Largest	Q2 2026
Maverick Capital Ltd	Q1 2021	$271m	$271m
T. Rowe Price Associates Inc	Q1 2020	$1.0bn	$239m
MFS Investment Management	Q3 2022	$221m	$221m
Holocene Advisors LP	Q1 2018	$184m	$176m
AllianceBernstein LP	Q1 2020	$329m	$94m
Janus Henderson Group Ltd	Q2 2026	$55m	$55m
Balyasny Asset Management LLC	Q1 2020	$103m	$49m
Marshall Wace LLP	Q2 2014	$284m	$38m
Hudson Bay Capital Management LP	Q1 2022	$11m	$8.2m
Moore Capital Management LP	Q3 2023	$25m	$5.1m
Invesco Ltd	Q3 2018	$618m	last listed Q1 2023
Fidelity (FMR LLC)	Q3 2023	$354m	last listed Q3 2023
Artisan Partners LP	Q1 2020	$274m	last listed Q1 2026
Wellington Management Group LLP	Q1 2019	$251m	last listed Q1 2024
Point72 Asset Management LP	Q3 2018	$238m	last listed Q1 2026
Citadel Advisors LLC	Q4 2024	$228m	last listed Q4 2025
Renaissance Technologies LLC	Q1 2015	$132m	last listed Q2 2022
Millennium Management LLC	Q2 2020	$109m	last listed Q4 2025
Walleye Capital LLC	Q1 2025	$68m	last listed Q4 2025
Two Sigma Investments LP	Q2 2024	$65m	last listed Q2 2025

What RGEN 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 RGEN →

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.

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The holdings, every quarter, and the week between

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