Marketaxess Holdings Inc (MKTX) - 13D/13G Filings

Real time Form 13D and 13G transaction reports:

  • Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
  • Due to inconsistent filing format, it is highly recommended that you read the orignal filing form.
  • Shares have beem adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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Reported
DateTime
Transaction
Date
TypeCompany
Symbol
Filed By
Symbol
Shares Owned
% Owned
Shares Vs. Prev ReportView
2026-08-14
4:00 pm
Purchase
2026-06-3013GMARKET
MKTX
North Reef Capital Management L.P.3,395,000
9.550%
1,520,000increase
(+81.07%)
Filing
History
2026-08-13
11:13 am
Sale
2026-06-3013GMARKET
MKTX
AQR CAPITAL MANAGEMENT LLC1,987,288
5.590%
-570,809decrease
(-22.31%)
Filing
History
2026-08-06
4:14 pm
Purchase
2026-06-3013GMARKET
MKTX
PRIMECAP MANAGEMENT CO3,504,905
9.860%
329,480increase
(+10.38%)
Filing
History
2026-05-15
2:00 pm
Purchase
2026-03-3113GMARKET
MKTX
North Reef Capital Management L.P.1,875,000
5.270%
1,875,000increase
(New Position)
Filing
History
2026-05-06
11:30 am
Sale
2026-03-3113GMARKET
MKTX
FMR LLC1,500,929
4.200%
-795,228decrease
(-34.63%)
Filing
History
2026-04-30
11:45 am
Purchase
2026-03-3113GMARKET
MKTX
VANGUARD CAPITAL MANAGEMENT LLC1,892,096
5.320%
1,892,096increase
(New Position)
Filing
History
2026-04-29
2:14 pm
Purchase
2026-03-3113GMARKET
MKTX
VANGUARD PORTFOLIO MANAGEMENT LLC2,168,085
6.090%
2,168,085increase
(New Position)
Filing
History
2026-03-27
10:30 am
Sale
2026-03-1313GMARKET
MKTX
VANGUARD GROUP INC0
0.000%
-3,854,312decrease
(Position Closed)
Filing
History
2026-02-13
09:17 am
Purchase
2025-12-3113GMARKET
MKTX
AQR CAPITAL MANAGEMENT LLC2,558,097
6.880%
2,558,097increase
(New Position)
Filing
History
2026-02-11
12:56 pm
Purchase
2025-12-3113GMARKET
MKTX
PRIMECAP MANAGEMENT CO3,175,425
8.540%
944,830increase
(+42.36%)
Filing
History
2026-02-06
12:08 pm
Purchase
2026-01-3113GMARKET
MKTX
BlackRock, Inc.
BLK
4,034,537
10.900%
353,892increase
(+9.61%)
Filing
History
2026-01-21
12:30 pm
Purchase
2025-12-3113GMARKET
MKTX
BlackRock, Inc.
BLK
3,680,645
9.900%
2,108,132increase
(+134.06%)
Filing
History
2025-11-14
12:18 pm
Sale
2025-09-3013GMARKET
MKTX
T. Rowe Price Investment Management, Inc.1,370,694
3.700%
-691,597decrease
(-33.54%)
Filing
History
2025-11-13
8:32 pm
Purchase
2025-09-3013GMARKET
MKTX
PRIMECAP MANAGEMENT CO2,230,595
5.970%
2,230,595increase
(New Position)
Filing
History
2025-10-31
11:04 am
Sale
2025-09-3013GMARKET
MKTX
VANGUARD GROUP INC3,854,312
10.310%
-672,110decrease
(-14.85%)
Filing
History
2025-10-17
6:13 pm
Sale
2025-09-3013GMARKET
MKTX
BlackRock, Inc.
BLK
1,572,513
4.200%
-907,978decrease
(-36.60%)
Filing
History
2025-08-06
12:06 pm
Purchase
2025-06-3013GMARKET
MKTX
FMR LLC2,296,157
6.100%
377,581increase
(+19.68%)
Filing
History
2025-04-17
09:35 am
Sale
2025-03-3113GMARKET
MKTX
BlackRock, Inc.
BLK
2,480,491
6.600%
-698,075decrease
(-21.96%)
Filing
History
2025-02-14
4:14 pm
Sale
2024-12-3113GMARKET
MKTX
GUARDIAN CAPITAL LP1,789,582
4.746%
-93,250decrease
(-4.95%)
Filing
History
2024-11-14
1:28 pm
Purchase
2024-09-3013GMARKET
MKTX
T. Rowe Price Investment Management, Inc.2,062,291
5.500%
833,961increase
(+67.89%)
Filing
History
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