Free · no sign-up · Q2 2026

Which funds own IDXX

Idexx Labs Inc in the Q2 2026 filings. At least 13 of the 91 current managers on file reported a position, worth $4.0bn between them. It is among the largest positions of fewer than a fifth of the current managers on file. The quarter went one way: 10 managers opened or added against 5 cutting.

Managers holding: 13; at least, of 91 current
Combined value: $4.0bn; as reported
Opened: 3; new this quarter
Added to: 7; already held
Trimmed or sold out: 5; 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
Invesco Ltd Long-only · $1264bn book	$1.9bn	0.2%	3,611,416	+$19m+261,739	Added
Arrowstreet Capital LP Quantitative · $225bn book	$562m	0.2%	1,067,078	+$90m+228,239	Added
Capital Research Global Investors Long-only · $717bn book	$416m	0.1%	789,111	-$24m+7,766	Added
Polen Capital Management LLC Long-only · $11.6bn book	$280m	2.4%	532,384	-$111m-163,427	Trimmed
Baillie Gifford & Co Long-only · $110bn book	$186m	0.2%	353,797	opened353,797	New
Neuberger Berman Group LLC Long-only · $150bn book	$186m	0.1%	353,322	-$11m+3,615	Added
Squarepoint Ops LLC Multi-strategy · $90.5bn book	$166m	0.2%	315,164	+$110m+214,855	Added
Point72 Asset Management LP Multi-strategy · $90.7bn book	$138m	0.2%	262,905	+$66m+133,621	Added
Holocene Advisors LP Long/short equity · $44.4bn book	$92m	0.2%	175,568	+$9.4m+27,836	Added
Freestone Grove Partners LP Multi-strategy · $15.6bn book	$32m	0.2%	60,557	-$19m-29,959	Trimmed
Quantbot Technologies LP Quantitative · $2.5bn book	$5.1m	0.2%	9,631	opened9,631	New
Farallon Capital Management LLC Long/short equity · $21.7bn book	$4.7m	0.0%	9,000	opened9,000	New
Harris Associates LP Activist · $75.4bn book	$200k	0.0%	455	unchanged-27	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$280m held before
Tudor Investment Corp · Macro$4.9m held before

Ownership through time

At least 22 of the 95 managers whose filings are on file listed IDXX in Q2 2026, against 6 in Q2 2013. 6 managers more than in Q1 2026: 6 started positions; 3 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

Baillie Gifford & Co$186m
MFS Investment Management$180m
ExodusPoint Capital Management LP$6.8m
Brevan Howard Capital Management LP$5.6m
Quantbot Technologies LP$5.1m
Farallon Capital Management LLC$4.7m

Largest increases, by shares

Baillie Gifford & Conew: 353,797 shares+$186m
MFS Investment Managementnew: 336,986 shares+$180m
Invesco Ltd3,349,677 to 3,611,416 shares+$138m
Arrowstreet Capital LP838,839 to 1,067,078 shares+$120m
Squarepoint Ops LLC100,309 to 315,164 shares+$113m

Largest decreases, by shares

T. Rowe Price Associates Inc638,063 to 458,318 shares-$95m
Polen Capital Management LLC695,811 to 532,384 shares-$86m
Freestone Grove Partners LP90,516 to 60,557 shares-$16m
Wellington Management Group LLP735,475 to 726,695 shares-$4.6m
Harris Associates LP482 to 455 shares-$14k

Left it

Capital World Investorswas $280m

Manager	First listed	Largest	Q2 2026
Invesco Ltd	Q1 2017	$2.2bn	$1.9bn
Arrowstreet Capital LP	Q1 2017	$562m	$562m
Capital Research Global Investors	Q4 2023	$441m	$415m
Wellington Management Group LLP	Q1 2020	$527m	$383m
Polen Capital Management LLC	Q2 2025	$720m	$280m
T. Rowe Price Associates Inc	Q2 2013	$1.0bn	$241m
Baillie Gifford & Co	Q2 2013	$186m	$186m
Neuberger Berman Group LLC	Q2 2013	$544m	$186m
MFS Investment Management	Q4 2014	$205m	$180m
Squarepoint Ops LLC	Q1 2015	$166m	$166m
Point72 Asset Management LP	Q3 2017	$138m	$138m
Holocene Advisors LP	Q1 2019	$92m	$92m
Renaissance Technologies LLC	Q2 2013	$473m	$58m
Marshall Wace LLP	Q2 2015	$150m	$49m
Freestone Grove Partners LP	Q4 2024	$51m	$32m
AllianceBernstein LP	Q1 2020	$1.8bn	last listed Q1 2025
Fidelity (FMR LLC)	Q1 2020	$725m	last listed Q4 2022
Ruane Cunniff & Goldfarb LP	Q2 2013	$700m	last listed Q3 2019
Capital World Investors	Q1 2017	$655m	last listed Q1 2026
Citadel Advisors LLC	Q4 2022	$356m	last listed Q1 2023
Acadian Asset Management LLC	Q2 2017	$239m	last listed Q1 2026
Janus Henderson Group Ltd	Q4 2014	$193m	last listed Q2 2022
Millennium Management LLC	Q4 2014	$181m	last listed Q4 2024
Durable Capital Partners LP	Q1 2020	$153m	last listed Q1 2025
AQR Capital Management LLC	Q1 2017	$119m	last listed Q3 2025

What IDXX 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.

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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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