Ticker · CUSIP 57060D108

MKTX

MARKETAXESS HLDGS INC

Financial Services·Capital Markets

···Share

Holders (tracked)

Combined shares

4,971,613

Combined value

$901.11M

Last close

$169.00

Quarter

2025Q4

Price is -6.8% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$169.00-52.52 (-23.71%)H $227.35 · L $157.46 · Avg Vol 622K

Tracked holders · last 8 quarters

+5 vs previous quarter over the last 8.

SEC event timeline

25 events

Pintoff Scott · General Counsel and Secretary
2026-04-10
Sold $17.2K @ $171.96
Insider sell
T. Rowe Price added2026-02-17
+2,381 shares · 2025Q4
Position
Ken Griffin (Citadel Advisors) added2026-02-17
+315,122 shares · 2025Q4
Position
D.E. Shaw & Co. trimmed2026-02-17
−149,519 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+1,607,009 shares · 2025Q4
Position
Two Sigma Investments added2026-02-17
+169,143 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+23,589 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−305,891 shares · 2025Q4
Position
Steve Cohen (Point72) exited2026-02-17
−163,900 shares · 2025Q4
Position
Ray Dalio (Bridgewater Associates) opened position2026-02-13
+13,261 shares · 2025Q4
Position
Renaissance Technologies trimmed2026-02-12
−69,000 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+503,855 shares · 2025Q4
Position
First Eagle Investment Management opened position2026-02-04
+22 shares · 2025Q4
Position
Baillie Gifford & Co trimmed2026-01-23
−125,083 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) exited2025-12-09
−93,154 shares · 2025Q3
Position
AQR Capital Management added2025-11-14
+192,626 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+175,374 shares · 2025Q3
Position
Steve Cohen (Point72) added2025-11-14
+108,432 shares · 2025Q3
Position
Two Sigma Investments added2025-11-14
+84,295 shares · 2025Q3
Position
D.E. Shaw & Co. added2025-11-14
+16,720 shares · 2025Q3
Position
T. Rowe Price trimmed2025-11-14
−27,884 shares · 2025Q3
Position
Renaissance Technologies added2025-11-13
+54,400 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−513,089 shares · 2025Q3
Position
Norges Bank (Norway SWF) added2025-11-12
+11,159 shares · 2024Q3
Position
Baillie Gifford & Co trimmed2025-10-31
−22,491 shares · 2025Q3
Position

Insider activity

Last 30 days

Net (open-market)

−$17.2K

Buys

0 · $0

Sells

1 · $17.2K

Unique insiders

Date	Insider	Code	Shares	Price	Value
04-10	Pintoff Scott General Counsel and Secretary · Insider	S	100	$171.96	$17.2K

View full insider history for MKTX →

Follow-the-investor returns

If you'd copied each holder of MKTX…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Ken Griffin (Citadel Advisors)	2016Q2	$180.85	-6.6%	$5.6M
Ken Griffin (Citadel Advisors)	2016Q2	$180.85	-6.6%	$5.6M
Ken Griffin (Citadel Advisors)	2016Q2	$180.85	-6.6%	$5.6M
First Eagle Investment Management	2025Q4	$181.27	-6.8%	$4K
AQR Capital Management	2016Q1	$192.46	-12.2%	$432.3M
Izzy Englander (Millennium Mgmt)	2016Q1	$197.53	-14.4%	$8.7M
Izzy Englander (Millennium Mgmt)	2016Q1	$197.53	-14.4%	$8.7M
Two Sigma Investments	2020Q3	$197.77	-14.5%	$90.2M
Renaissance Technologies	2016Q1	$206.07	-18.0%	$29.7M
Baillie Gifford & Co	2016Q1	$210.47	-19.7%	$6.6M
D.E. Shaw & Co.	2016Q1	$216.77	-22.0%	$6.1M
Paul Tudor Jones (Tudor Investment)	2016Q2	$223.20	-24.3%	$389K
Paul Tudor Jones (Tudor Investment)	2016Q2	$223.20	-24.3%	$389K
Paul Tudor Jones (Tudor Investment)	2016Q2	$223.20	-24.3%	$389K
Ray Dalio (Bridgewater Associates)	2019Q4	$234.37	-27.9%	$2.2M
T. Rowe Price	2016Q1	$308.95	-45.3%	$5.7M
Norges Bank (Norway SWF)	2016Q1	$10481.20	-98.4%	$85.2M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions4

Norges Bank (Norway SWF)
+503,855
$91.3M
Paul Tudor Jones (Tudor Investment)
+23,589
$4.3M
Ray Dalio (Bridgewater Associates)
+13,261
$2.4M
First Eagle Investment Management
+22
$4K

Added to4

AQR Capital Management
+1,607,009
$291.3M
Ken Griffin (Citadel Advisors)
+315,122
$57.1M
Two Sigma Investments
+169,143
$30.7M
T. Rowe Price
+2,381
$432

Trimmed4

Izzy Englander (Millennium Mgmt)
−305,891
$55.4M
D.E. Shaw & Co.
−149,519
$27.1M
Baillie Gifford & Co
−125,083
$22.7M
Renaissance Technologies
−69,000
$12.5M

Exited1

Steve Cohen (Point72)
−163,900
$28.6M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	20	10,979,973	$122.48B	—
2022Q2	22	9,740,579	$94.71B	+2
2022Q3	21	7,301,656	$1.62B	-1
2022Q4	19	6,418,329	$1.79B	-2
2023Q1	19	6,912,262	$2.70B	—
2023Q2	17	7,167,511	$1.87B	-2
2023Q3	19	6,383,026	$1.36B	+2
2023Q4	13	5,730,563	$1.68B	-6
2024Q1	16	4,783,707	$1.05B	+3
2024Q2	15	4,946,075	$991.8M	-1
2024Q3	14	2,034,626	$521.3M	-1
2024Q4	12	1,856,778	$419.7M	-2
2025Q1	12	2,226,121	$481.6M	—
2025Q2	15	3,157,175	$702.9M	+3
2025Q3	12	3,842,024	$669.5M	-3
2025Q4	17	4,971,613	$901.1M	+5

Congress members trading this stock

Date	Member	Type	Amount range	Filing
2025-02-12	Julie Johnson	Sell	$1K – $15K	PDF ↗
2025-01-15	Julie Johnson	Buy	$1K – $15K	PDF ↗

Who owns MKTX

17 super-investors · 2025Q4

Tracked stake

4.97M

Combined value

$901M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New6Added6Trim5

#	Manager	Shares	Value	% of book	Last action	8Q trend
1	AQR Capital Management	2.56M	$464M	0.2%	Added+1.61M
2	Ken Griffin Citadel Advisors	625.2K	$113M	0.0%	Added+315.1K
3	Two Sigma Investments	533.5K	$97M	0.1%	Added+169.1K
4	Norges Bank Norway SWF	503.9K	$91M	0.0%	New+503.9K
5	Izzy Englander Millennium Mgmt	301.7K	$55M	0.0%	Trim−305.9K
6	Renaissance Technologies	176.0K	$32M	0.0%	Trim−69.0K
7	Izzy Englander Millennium Mgmt	51.2K	$9M	0.0%	Trim−305.9K
8	Baillie Gifford & Co	39.1K	$7M	0.0%	Trim−125.1K
9	Ken Griffin Citadel Advisors	37.1K	$7M	0.0%	Added+315.1K
10	D.E. Shaw & Co.	36.1K	$7M	0.0%	Trim−149.5K
11	T. Rowe Price	34.0K	$6M	0.0%	Added+2.4K
12	Ken Griffin Citadel Advisors	33.2K	$6M	0.0%	Added+315.1K
13	Paul Tudor Jones Tudor Investment	23.6K	$4M	0.0%	New+23.6K
14	Ray Dalio Bridgewater Associates	13.3K	$2M	0.0%	New+13.3K
15	Paul Tudor Jones Tudor Investment	3.4K	$616K	0.0%	New+23.6K
16	Paul Tudor Jones Tudor Investment	2.3K	$417K	0.0%	New+23.6K
17	First Eagle Investment Management	22	$4K	0.0%	New+22	—

Recent moves

20 transactions

ADDKen Griffin (Citadel Advisors)
+315,122 · 2025Q4
ADDTwo Sigma Investments
+169,143 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+23,589 · 2025Q4
TRIMD.E. Shaw & Co.
−149,519 · 2025Q4
ADDAQR Capital Management
+1,607,009 · 2025Q4
SOLDSteve Cohen (Point72)
−163,900 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−305,891 · 2025Q4
ADDT. Rowe Price
+2,381 · 2025Q4
NEWRay Dalio (Bridgewater Associates)
+13,261 · 2025Q4
TRIMRenaissance Technologies
−69,000 · 2025Q4
NEWNorges Bank (Norway SWF)
+503,855 · 2025Q4
NEWFirst Eagle Investment Management
+22 · 2025Q4
TRIMBaillie Gifford & Co
−125,083 · 2025Q4
SOLDPaul Tudor Jones (Tudor Investment)
−93,154 · 2025Q3
ADDSteve Cohen (Point72)
+108,432 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+175,374 · 2025Q3
ADDTwo Sigma Investments
+84,295 · 2025Q3
ADDD.E. Shaw & Co.
+16,720 · 2025Q3
TRIMT. Rowe Price
−27,884 · 2025Q3
ADDAQR Capital Management
+192,626 · 2025Q3

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