Marketaxess: North Reef reports 5.27% stake

Marketaxess Holdings Inc ownership filing: North Reef Capital Management LP and affiliated filers report beneficial ownership of 1,875,000 shares of Common Stock, representing 5.27% of the class as of 03/31/2026.

Rhea-AI Filing Summary

Marketaxess Holdings Inc ownership filing: North Reef Capital Management LP and affiliated filers report beneficial ownership of 1,875,000 shares of Common Stock, representing 5.27% of the class as of 03/31/2026. The filing lists shared voting and dispositive power over these shares.

Insights

Institutional Ownership Analyst

North Reef reports a passive, >5% stake in Marketaxess.

The filing shows 1,875,000 shares beneficially owned, equal to 5.27% of common stock as of 03/31/2026. Ownership is reported as shared voting and dispositive power, consistent with an institutional position.

Future disclosures may provide changes in position; cash‑flow treatment is not stated in the excerpt.

Compliance & Filings Specialist

Schedule 13G format and signatories are complete.

Signatures include a Chief Compliance Officer and the managing member, with the joint filing agreement referenced as Exhibit 99.1. The CUSIP 57060D108 and class title are specified, aligning with standard beneficial ownership reporting.

Timing: the report cites an ownership as of 03/31/2026 and signatures dated 05/15/2026.

Key Figures

Filing type: Schedule 13G Shares beneficially owned: 1,875,000 shares Percent of class: 5.27% +2 more

5 metrics

Filing type Schedule 13G Beneficial ownership report for common stock

Shares beneficially owned 1,875,000 shares Ownership reported as of 03/31/2026

Percent of class 5.27% Percent of common stock as of 03/31/2026

CUSIP 57060D108 Identifies Marketaxess common stock class

Signature date 05/15/2026 Signatures by compliance officer and managing member

Key Terms

Schedule 13G, Beneficially owned, Shared dispositive power

3 terms

Schedule 13G regulatory

"Name of form: SCHEDULE 13G — beneficial ownership report"

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 financial

"Amount beneficially owned: 1,875,000 — shows beneficial ownership"

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 dispositive power regulatory

"Shared Dispositive Power 1,875,000.00 — joint control over disposition"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake did North Reef report in Marketaxess (MKTX)?

They reported beneficial ownership of 1,875,000 shares, equal to 5.27% of Marketaxess common stock as of 03/31/2026. The filing lists shared voting and dispositive power over those shares.

Which entities and individuals signed the MKTX Schedule 13G?

The filing names North Reef Capital Management LP, North Reef Capital Management GP LLC, and James Hanna, III. Signatures include the Chief Compliance Officer and the managing member, dated 05/15/2026.

Does the Schedule 13G state how the shares were acquired?

The excerpt lists the amount and ownership percentages but does not describe acquisition method. It reports shared voting and dispositive power; transactional history or purchase dates are not included in the provided text.

What identifiers and filing details are in the MKTX submission?

The filing specifies the class as Common Stock, $0.003 par value with CUSIP 57060D108, ownership reported as of 03/31/2026, and an Exhibit 99.1 joint filing agreement attached.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/15/2026 - 02:00 PM EDT Learn about SEC filing dates

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, $0.003 par value

(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

North Reef Capital Management LP

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,875,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,875,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,875,000.00

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)

5.27 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): 57060D108

1

Names of Reporting Persons

North Reef Capital Management GP 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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,875,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,875,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,875,000.00

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)

5.27 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: Limited Liability Company

SCHEDULE 13G

CUSIP Number(s): 57060D108

1

Names of Reporting Persons

James Hanna, III

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

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,875,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,875,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,875,000.00

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)

5.27 %

12

Type of Reporting Person (See Instructions)

IN

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, NY 10001
Item 2.
(a)	Name of person filing: North Reef Capital Management LP North Reef Capital Management GP LLC James Hanna, III
(b)	Address or principal business office or, if none, residence: c/o North Reef Capital Management LP 1833 South Coast Highway Suite 210 Laguna Beach, California 92651
(c)	Citizenship: North Reef Capital Management LP - Delaware North Reef Capital Management GP LLC - Delaware James Hanna, III - California
(d)	Title of class of securities: Common Stock, $0.003 par value
(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: 1,875,000
(b)	Percent of class: 5.27%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,875,000
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,875,000
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.
	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.
	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.

North Reef Capital Management LP

Signature:	/s/ Daniel Locasto
Name/Title:	Chief Compliance Officer
Date:	05/15/2026

North Reef Capital Management GP LLC

Signature:	/s/ James Hanna, III
Name/Title:	Managing Member
Date:	05/15/2026

James Hanna, III

Signature:	/s/ James Hanna, III
Name/Title:	James Hanna, III
Date:	05/15/2026

Exhibit Information

EXHIBIT 99.1 - JOINT FILING AGREEMENT