Free · no sign-up · Q2 2026

Which funds own MKTX

MarketAxess Holdings in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $3.2m 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: $3.2m; as reported
Opened: 0; new this quarter
Added to: 1; 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
PDT Partners LLC Quantitative · $1.9bn book	$3.2m	0.2%	28,171	+$2.5m+23,891	Added

Sold out of this quarter

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

Baillie Gifford & Co · Long-only$4.8m held before
Quantbot Technologies LP · Quantitative$1.1m held before

Ownership through time

At least 10 of the 95 managers whose filings are on file listed MKTX in Q2 2026, against 2 in Q2 2013. 3 managers fewer than in Q1 2026: 3 started positions; 1 sold out, by its own filing; 5 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

Freestone Grove Partners LP$20m
Brevan Howard Capital Management LP$5.8m
Caxton Associates LLP$1.2m

Largest increases, by shares

Neuberger Berman Group LLC966,029 to 1,229,929 shares+$30m
Freestone Grove Partners LPnew: 172,799 shares+$20m
Brevan Howard Capital Management LPnew: 51,050 shares+$5.8m
First Eagle Investment Management LLC22 to 49,577 shares+$5.6m
PDT Partners LLC4,280 to 28,171 shares+$2.7m

Largest decreases, by shares

AQR Capital Management LLC2,683,745 to 1,987,288 shares-$78m
Walleye Capital LLC332,723 to 94,002 shares-$27m
Holocene Advisors LP43,799 to 38,269 shares-$628k

Left it

Baillie Gifford & Cowas $4.8m

Manager	First listed	Largest	Q2 2026
AQR Capital Management LLC	Q4 2016	$464m	$223m
Neuberger Berman Group LLC	Q3 2014	$367m	$140m
Two Sigma Investments LP	Q3 2020	$97m	$62m
Freestone Grove Partners LP	Q4 2024	$20m	$20m
Walleye Capital LLC	Q2 2022	$55m	$11m
Brevan Howard Capital Management LP	Q3 2024	$5.9m	$5.8m
First Eagle Investment Management LLC	Q4 2025	$5.6m	$5.6m
Holocene Advisors LP	Q4 2017	$54m	$4.3m
PDT Partners LLC	Q1 2020	$8.6m	$3.2m
Caxton Associates LLP	Q2 2020	$8.8m	$1.2m
T. Rowe Price Associates Inc	Q4 2017	$1.7bn	last listed Q4 2023
Baillie Gifford & Co	Q2 2013	$1.4bn	last listed Q1 2026
Fidelity (FMR LLC)	Q3 2024	$521m	last listed Q2 2025
Renaissance Technologies LLC	Q2 2013	$519m	last listed Q4 2025
Capital World Investors	Q4 2015	$461m	last listed Q1 2021
Wellington Management Group LLP	Q2 2015	$383m	last listed Q1 2022
Invesco Ltd	Q2 2016	$305m	last listed Q4 2021
AllianceBernstein LP	Q4 2016	$249m	last listed Q4 2021
Janus Henderson Group Ltd	Q4 2014	$184m	last listed Q2 2025
Millennium Management LLC	Q2 2019	$179m	last listed Q1 2026

What MKTX 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 MKTX →

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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