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MKTX in the 13F filings

Marketaxess Holdings Inc · CUSIP 57060D108

Sector · Other financial servicesTheme · Financial services· L3VLUP-defined
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Dec 2024
the date the book describes
Filed
5 Nov 2026
latest of these filings; the earliest 31 Jan 2025
Managers listing it
15
at least, of 95 tracked, among listed positions
Comparable managers
94
filed both Q3 2024 and Q4 2024; 9 listed it in both
Shares listed
4,477,972
combined, among listed positions
Reported value
$1.0bn
combined, at the quarter end

Among the 94 comparable managers: 9 buyers (opened or added shares) and 6 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing MKTX in Q4 2024

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2024, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

15 of 15 holders

ActionFiling
Fidelity (FMR LLC)2,300,536$520munder 0.1%Added+341,4935 Nov 2026 (the filing on sec.gov)
Marshall Wace LLP481,431$109m0.13%Trimmed-3,33213 Feb 2025 (the filing on sec.gov)
Baillie Gifford & Co303,200$69m0.05%Trimmed-15,39831 Jan 2025 (the filing on sec.gov)
Two Sigma Investments LP288,319$65m0.14%Added+51,39614 Feb 2025 (the filing on sec.gov)
Artisan Partners LP246,297$56m0.08%Trimmed-14,00212 Feb 2025 (the filing on sec.gov)
Two Sigma Advisers LP233,100$53m0.12%Added+44,70014 Feb 2025 (the filing on sec.gov)
Renaissance Technologies LLC227,880$52m0.08%Added+40,27013 Feb 2025 (the filing on sec.gov)
Balyasny Asset Management LLC212,163$48m0.07%Addedn.a.14 Feb 2025 (the filing on sec.gov)
Walleye Capital LLC102,427$23m0.06%Addedn.a.13 Feb 2025 (the filing on sec.gov)
Hudson Bay Capital Management LP29,897$6.8munder 0.1%Trimmed-28,61814 Feb 2025 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC22,906$5.2munder 0.1%Addedn.a.14 Feb 2025 (the filing on sec.gov)
Quantbot Technologies LP14,199$3.2m0.12%Newnew11 Feb 2025 (the filing on sec.gov)
Caxton Associates LLP8,173$1.8m0.06%Newnew14 Feb 2025 (the filing on sec.gov)
Polen Capital Management LLC4,357$985kunder 0.1%Trimmed-4,31210 Feb 2025 (the filing on sec.gov)
Freestone Grove Partners LP3,087$698kunder 0.1%Heldn.a.14 Feb 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2024 to Q4 2024, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (2)

Exited (1)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
14 in Q3 2024 to 10 in Q2 2026

Tracked managers listing it, at least.

051015202014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MKTX by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20132$24mn.a.n.a.
Q3 20133$53mn.a.n.a.
Q4 20133$65mn.a.n.a.
Q1 20143$75mn.a.n.a.
Q2 20142$104mn.a.n.a.
Q3 20144$158mn.a.n.a.
Q4 20143$170mn.a.n.a.
Q1 20153$215mn.a.n.a.
Q2 20154$381mn.a.n.a.
Q3 20154$426mn.a.n.a.
Q4 20155$566mn.a.n.a.
Q1 20165$717mn.a.n.a.
Q2 20168$1.1bnn.a.n.a.
Q3 20168$1.1bnn.a.n.a.
Q4 20169$785mn.a.n.a.
Q1 201711$1.3bnn.a.n.a.
Q2 201711$1.6bnn.a.n.a.
Q3 20179$1.5bnn.a.n.a.
Q4 201713$2.4bnn.a.n.a.
Q1 201813$2.7bnn.a.n.a.
Q2 201812$2.4bnn.a.n.a.
Q3 201811$2.1bnn.a.n.a.
Q4 201812$2.5bnn.a.n.a.
Q1 201911$2.7bnn.a.n.a.
Q2 201912$3.4bnn.a.n.a.
Q3 201910$3.2bnn.a.n.a.
Q4 201912$3.3bnn.a.n.a.
Q1 202018$2.5bnn.a.n.a.
Q2 202016$3.2bnn.a.n.a.
Q3 202015$2.7bnn.a.n.a.
Q4 202016$3.4bnn.a.n.a.
Q1 202117$3.4bnn.a.n.a.
Q2 202113$3.6bnn.a.n.a.
Q3 202112$3.1bnn.a.n.a.
Q4 202114$3.2bnn.a.n.a.
Q1 202214$2.3bnn.a.n.a.
Q2 202218$1.6bnn.a.n.a.
Q3 202216$672mn.a.n.a.
Q4 20229$671mn.a.n.a.
Q1 20237$1.1bnn.a.n.a.
Q2 20239$756mn.a.n.a.
Q3 202314$595mn.a.n.a.
Q4 202313$898m85
Q1 20249$353m55
Q2 202414$562m114
Q3 202414$1.0bn95
Q4 202415$1.0bn96
Q1 202513$1.0bn95
Q2 202519$1.2bn139
Q3 202516$670m133
Q4 202514$892m1620
Q1 202613$1.0bn1319
Q2 202610$475m1915

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MKTX and V →MKTX and AXP →MKTX and BAC →Choose a stock to compare with MKTX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MKTX, latest filings →Back to the 13F Explorer →