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MarketAxess Holdings
MKTX

509 hedge funds and large institutions have $8.05B invested in MarketAxess Holdings in 2025 Q1 according to their latest regulatory filings, with 79 funds opening new positions, 200 increasing their positions, 181 reducing their positions, and 83 closing their positions.

New
Increased
Maintained
Reduced
Closed

113% more call options, than puts

Call options by funds: $40.6M | Put options by funds: $19.1M

100% more funds holding in top 10

Funds holding in top 10: 2 → 4 (+2)

10% more repeat investments, than reductions

Existing positions increased: 200 | Existing positions reduced: 181

5% less first-time investments, than exits

New positions opened: 79 | Existing positions closed: 83

1.19% less ownership

Funds ownership: 99.95% → 98.76% (-1.2%)

2% less funds holding

Funds holding: 518 → 509 (-9)

5% less capital invested

Capital invested by funds: $8.52B → $8.05B (-$463M)

Holders
509
Holders Change
-9
Holders Change %
-1.74%
% of All Funds
6.83%
Holding in Top 10
4
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+100%
% of All Funds
0.05%
New
79
Increased
200
Reduced
181
Closed
83
Calls
$40.6M
Puts
$19.1M
Net Calls
+$21.5M
Net Calls Change
+$24.8M

Top Buyers

1
Millennium Management
Millennium Management
New York
+$99.7M
2
Citadel Advisors
Citadel Advisors
Florida
+$78.5M
3
Holocene Advisors
Holocene Advisors
New York
+$52.6M
4
American Century Companies
American Century Companies
Missouri
+$42.5M
5
BAM
Burgundy Asset Management
Ontario, Canada
+$33.2M

Top Sellers

1
BlackRock
BlackRock
New York
-$117M
2
Artisan Partners
Artisan Partners
Wisconsin
-$55.7M
3
GAM
GuardCap Asset Management
United Kingdom
-$50.5M
4
JP Morgan Chase
JP Morgan Chase
New York
-$38.9M
5
State Street
State Street
Massachusetts
-$34.5M
Name Holding Trade Value Shares
Change 		Change in
Stake
PCM
576
Penserra Capital Management
California
– -$21K -96 Closed
RIL
577
Rothschild Investment LLC
Illinois
– -$20.8K -92 Closed
LFA
578
LGT Financial Advisors
Texas
– -$4.75K -21 Closed
TAM
579
Tucker Asset Management
Colorado
– -$4.29K -19 Closed
AS
580
Altshuler Shaham
Israel
– -$3.84K -17 Closed
GBT
581
Grove Bank & Trust
Florida
– -$3.39K -15 Closed
RCM
582
Raleigh Capital Management
North Carolina
– -$2.71K -12 Closed
RIM
583
Ranger Investment Management
Texas
– -$2.71K -12 Closed
DF
584
Dunhill Financial
United Kingdom
– -$2.51K -11 Closed
VWM
585
Venturi Wealth Management
Texas
– -$2.26K -10 Closed
EBA
586
Eagle Bay Advisors
New York
– -$1.81K -8 Closed
MSWM
587
Mowery & Schoenfeld Wealth Management
Illinois
– -$1.36K -6 Closed
NWWA
588
New Wave Wealth Advisors
Arkansas
– -$1.36K -6 Closed
TFM
589
TFC Financial Management
Massachusetts
– -$1.13K -5 Closed
FFO
590
Fortitude Family Office
Arizona
– -$452 -2 Closed
AWM
591
Avior Wealth Management
Nebraska
– -$226 -1 Closed
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MKTX Hedge Fund Activity: Q1 2025 in Review

509 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in MarketAxess Holdings (MKTX) for Q1 2025, worth a combined $8.05B — down 5.4% from $8.52B a quarter earlier.

Sellers outnumbered buyers: 83 funds closed out of MKTX and 79 opened new positions — a net loss of 4 holders — while 181 trimmed existing stakes and 200 added.

The largest buyer was Millennium Management, adding an estimated $99.7M. The largest seller was BlackRock, cutting an estimated $117M.

  • 509 institutional investors held MarketAxess Holdings (MKTX) as of Q1 2025, down from 518 in Q4 2024.
  • Funds reported $8.05B of MarketAxess Holdings stock for Q1 2025, down 5.4% quarter-over-quarter.
  • 79 funds opened new MarketAxess Holdings positions in Q1 2025 and 83 closed out, a net change of -4 holders.
  • The largest MarketAxess Holdings buyer in Q1 2025 was Millennium Management, an estimated $99.7M added.
  • The largest MarketAxess Holdings seller in Q1 2025 was BlackRock, an estimated $117M sold.

Based on aggregated 13F filings for Q1 2025.