Security key
57060D108
MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (MKTX)
CUSIP: 57060D108
Q3 2025 13F Holders as of 30 Sep 2025
- Security type / class
- Equity / Common Stock, $0.003 par value
- Total 13F shares
- 35,596,429
- Total 13F value
- $6,208,747,159
- Share change
- -1,696,202
- Put/Call ratio
- 11%
- SEC-reported price per share
- $174.25
- Number of holders
- 444
- Value change
- -$376,325,012
- Number of buys
- 217
- Number of sells
- 319
- Shares outstanding
- 35,578,748
Holder snapshot
7 signals
Show 1 more signal
Security identity
1 source field
Report period
Q3 2025
Institutions
444
Top holders
10
MKTX full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q4 2025
Previous quarter: Q2 2025
MARKETAXESS HOLDINGS INC SEC filings
MARKETAXESS HOLDINGS INC company facts
Broader feeds
Reporting periods
Holder history for CUSIP 57060D108
Recent filing periods:
Ownership snapshot
Top reported holders of MKTX - MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
GUARDIAN CAPITAL LP
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
15/15
Latest evidence
08 Sep 2025
13D/G
13F
3/4/5
Lead comparable stake: 4.8%
13D/G row: GUARDIAN CAPITAL LP
Showing 1-6 of 15 holder rows.
Quick read
GUARDIAN CAPITAL LP leads the comparable SEC ownership view at 4.8%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Comparable ownership
Top 5
GUARDIAN CAPITAL LP
4.8%
T. Rowe Price Investment Manageme...
3.7%
Stephen P. Casper
0.15%
Christophe Pierre Daniel Roupie
0.02%
Emily H. Portney
0.01%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| GUARDIAN CAPITAL LP |
13D/G
|
4.8%
|
$391,918,458
1,789,582 shares
|
$0 | 31 Dec 2024 |
| T. Rowe Price Investment Management, Inc. |
13F
13D/G
Company
|
3.7%
from 13D/G
|
$520,827,000
2,331,988 shares
|
— | 30 Jun 2025 |
| Stephen P. Casper |
3/4/5
Director
|
0.15%
|
$10,136,563
53,193 shares
|
-$298,544 | 08 Sep 2025 |
| Christophe Pierre Daniel Roupie |
3/4/5
Head of EMEA and APAC
|
0.02%
|
$1,727,291
8,208 shares
|
— | 14 May 2025 |
| Emily H. Portney |
3/4/5
Director
|
0.01%
|
$959,261
4,440 shares
|
— | 13 Aug 2025 |
| Michael R. Cianciulli |
3/4/5
Head of Ext Rep & Comp Accting
|
0%
|
$246,165
1,155 shares
|
— | 01 Apr 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
444
Shares
35,596,429
Rows available
444
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
521
Q3 2025 holders
444
Holder diff
-77
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend