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MarketAxess Holdings Inc. common stock is the subject of an amended beneficial-ownership report in which AQR Capital Management, LLC and its parent, AQR Capital Management Holdings, LLC, each reported 1,231,052 shares, or 3.5% of the class, with a September 30, 2026 event date. Each reported shared voting power over 1,220,972 shares and shared dispositive power over 1,231,052 shares. AQR Capital Management, LLC is a wholly owned subsidiary of AQR Capital Management Holdings, LLC.
Key Figures
Beneficial ownership:1,231,052 sharesPercent of class:3.5%Shared voting power:1,220,972 shares+1 more
4 metrics
Beneficial ownership1,231,052 sharesEach reporting entity reported this amount; September 30, 2026 event date.
Percent of class3.5%Reported by each entity for MarketAxess common stock.
Shared voting power1,220,972 sharesReported by each entity.
Shared dispositive power1,231,052 sharesReported by each entity.
Key Terms
beneficially owned, Shared Voting Power, Shared Dispositive Power
3 terms
beneficially ownedregulatory
"Aggregate Amount Beneficially Owned by Each Reporting Person 1,231,052.00"
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.
Shared Voting Powerregulatory
"Shared Voting Power 1,220,972.00"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
Shared Dispositive Powerregulatory
"Shared Dispositive Power 1,231,052.00"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many MKTX shares did AQR report owning?
Each of AQR Capital Management, LLC and AQR Capital Management Holdings, LLC reported beneficial ownership of 1,231,052 shares, or 3.5% of the class, with a September 30, 2026 event date.
How many MKTX shares did AQR report shared voting power over?
Each reporting entity reported shared voting power over 1,220,972 shares and shared dispositive power over 1,231,052 shares.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
MARKETAXESS HOLDINGS INC
(Name of Issuer)
Common Stock, $0.003 par value
(Title of Class of Securities)
57060D108
(CUSIP Number)
09/30/2026
(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
AQR Capital Management, LLC
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,220,972.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,231,052.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,231,052.00
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)
3.5 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP Number(s):
57060D108
1
Names of Reporting Persons
AQR Capital Management Holdings, LLC
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,220,972.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,231,052.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,231,052.00
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)
3.5 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
MARKETAXESS HOLDINGS INC
(b)
Address of issuer's principal executive offices:
55 HUDSON YARDS, 15TH FLOOR, NEW YORK, NEW YORK
10001
Item 2.
(a)
Name of person filing:
AQR Capital Management, LLC
AQR Capital Management Holdings, LLC
(b)
Address or principal business office or, if none, residence:
ONE GREENWICH PLAZA
SUITE 130
Greenwich, Connecticut
06830
(c)
Citizenship:
AQR Capital Management, LLC - UNITED STATES
AQR Capital Management Holdings, LLC - UNITED STATES
(d)
Title of class of securities:
Common Stock, $0.003 par value
(e)
CUSIP No.:
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:
1,231,052
(b)
Percent of class:
3.50 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
AQR Capital Management, LLC - 0
AQR Capital Management Holdings, LLC - 0
(ii) Shared power to vote or to direct the vote:
AQR Capital Management, LLC - 1,220,972
AQR Capital Management Holdings, LLC - 1,220,972
(iii) Sole power to dispose or to direct the disposition of:
AQR Capital Management, LLC - 0
AQR Capital Management Holdings, LLC - 0
(iv) Shared power to dispose or to direct the disposition of:
AQR Capital Management, LLC - 1,231,052
AQR Capital Management Holdings, LLC - 1,231,052
Item 5.
Ownership of 5 Percent or Less of a Class.
Ownership of 5 percent or less of a class
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
See Item 2(a) above.
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.
AQR Capital Management, LLC
Signature:
Henry Parkin
Name/Title:
Authorized Signatory
Date:
11/12/2026
AQR Capital Management Holdings, LLC
Signature:
Henry Parkin
Name/Title:
Authorized Signatory
Date:
11/12/2026
Exhibit Information
AQR Capital Management Holdings, LLC and AQR Capital Management, LLC hereby agree that this Schedule 13G is filed on behalf of each of the parties. AQR Capital Management, LLC is a wholly owned subsidiary of AQR Capital Management Holdings, LLC.
