Vanguard Capital Management (MKTX) reports 5.32% ownership in MarketAxess

Rhea-AI Filing Summary

MarketAxess Holdings Inc reports that Vanguard Capital Management beneficially owned 1,892,096 shares of Common Stock, representing 5.32% of the class as of 03/31/2026. The filing states Vanguard has sole voting power for 282,837 shares and sole dispositive power for 1,892,096 shares. The statement attributes ownership across Vanguard affiliates and notes these shares include positions held for Vanguard funds and managed accounts. The filing is signed on 04/30/2026.

Insights

Institutional Ownership Analyst

Vanguard holds a sizable passive stake in MarketAxess at 5.32%.

The filing shows 1,892,096 shares and a 5.32% beneficial ownership level as of 03/31/2026, reflecting aggregated holdings across Vanguard business units and funds. This is a passive reporting schedule rather than an active acquisition.

Key dependencies include fund rebalancing and affiliate allocations; subsequent ownership changes will appear in amended schedules or other Section 13 filings.

Regulatory Compliance Specialist

Schedule 13G indicates passive investment reporting by an institutional investor.

The disclosure lists voting and dispositive powers explicitly: sole voting power 282,837 and sole dispositive power 1,892,096, and cites SEC Release No. 34-39538 for aggregation rules. The signature block shows filing formalities completed on 04/30/2026.

Future filings may amend ownership if the stake crosses passive thresholds or if voting intent changes.

Key Figures

Beneficial ownership: 1,892,096 shares Percent of class: 5.32% Sole voting power: 282,837 shares +2 more

5 metrics

Beneficial ownership 1,892,096 shares as of 03/31/2026

Percent of class 5.32% reported in Schedule 13G

Sole voting power 282,837 shares voting power reported by Vanguard

Sole dispositive power 1,892,096 shares dispositive power reported by Vanguard

Filing signature date 04/30/2026 signature by Head of Global Fund Administration

Key Terms

Schedule 13G, Beneficially owned, Dispositive power, SEC Release No. 34-39538

4 terms

Schedule 13G regulatory

"Name of form: SCHEDULE 13G reporting passive ownership"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Beneficially owned regulatory

"reflects the securities beneficially owned or deemed to be beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 1892096"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

SEC Release No. 34-39538 regulatory

"In accordance with SEC Release No. 34-39538 (January 12, 1998)"

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Accepted by SEC EDGAR 04/30/2026 - 11:45 AM Learn about SEC filing dates

FAQ

What stake does Vanguard Capital Management report in MarketAxess (MKTX)?

Vanguard reports beneficial ownership of 1,892,096 shares, equal to 5.32% of the class as of 03/31/2026. The figure aggregates holdings across Vanguard affiliates and managed funds.

How much voting power does Vanguard have in MKTX?

Vanguard reports sole voting power for 282,837 shares and no shared voting power. Voting and dispositive powers are listed separately in the filing.

Does the filing indicate Vanguard will sell or buy more MKTX shares?

No transaction instruction is provided. The Schedule 13G reports passive beneficial ownership and does not specify planned purchases or sales.

What date is the ownership figure tied to in the filing?

The ownership count is reported with the date 03/31/2026, and the filing is signed on 04/30/2026, per the signature block.

Why does the filing reference Vanguard affiliates?

The filing states aggregation under SEC Release No. 34-39538 and attributes the shares to Vanguard Capital Management and affiliates that exercise dispositive or voting power over managed funds and accounts.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

MarketAxess Holdings Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

57060D108

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 57060D108

1

Names of Reporting Persons

Vanguard Capital Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 282,837.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,892,096.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,892,096.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.32 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MarketAxess Holdings Inc
(b)	Address of issuer's principal executive offices: 299 Park Avenue, 10th Floor, New York, NY, 10171
Item 2.
(a)	Name of person filing: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 57060D108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1892096
(b)	Percent of class: 5.32 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 282837
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1892096
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Capital Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/30/2026