North Reef reports 9.55% stake in MarketAxess

North Reef Capital Management LP, together with North Reef Capital Management GP LLC and James Hanna, III, reports beneficial ownership of 3,395,000 shares of MarketAxess Holdings Inc. common stock.

Rhea-AI Filing Summary

North Reef Capital Management LP, together with North Reef Capital Management GP LLC and James Hanna, III, reports beneficial ownership of 3,395,000 shares of MarketAxess Holdings Inc. common stock.

This position represents 9.55% of the outstanding common shares. The reporting persons hold no sole voting or dispositive power, but have shared voting and shared dispositive power over all 3,395,000 shares.

Key Figures

Shares beneficially owned: 3,395,000 shares Percent of class: 9.55% Shared voting power: 3,395,000 shares +3 more

6 metrics

Shares beneficially owned 3,395,000 shares Beneficial ownership of MarketAxess common stock reported by the filers

Percent of class 9.55% Portion of MarketAxess common stock class beneficially owned

Shared voting power 3,395,000 shares Shares over which the filers share power to vote or direct the vote

Shared dispositive power 3,395,000 shares Shares over which the filers share power to dispose or direct disposition

Sole voting power 0 shares Shares with sole power to vote or direct the vote

Sole dispositive power 0 shares Shares with sole power to dispose or direct disposition

Key Terms

beneficially owned, shared voting power, shared dispositive power, Schedule 13G/A, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 3,395,000"

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 power financial

"(ii) Shared power to vote or to direct the vote: 3,395,000"

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 power financial

"(iv) Shared power to dispose or to direct the disposition of: 3,395,000"

Schedule 13G/A regulatory

""form_type": "SCHEDULE 13G/A""

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

CUSIP No. financial

"(e) | CUSIP No.: 57060D108"

FAQ

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

What ownership stake in MKTX does North Reef Capital report in this Schedule 13G/A?

North Reef Capital and related filers report beneficial ownership of 3,395,000 shares of MarketAxess Holdings Inc. common stock, representing 9.55% of the class, with shared voting and dispositive power over all of these shares.

Who are the reporting persons in the MarketAxess (MKTX) Schedule 13G/A amendment?

The reporting persons are North Reef Capital Management LP, North Reef Capital Management GP LLC, and James Hanna, III. All three jointly report beneficial ownership and shared voting and dispositive power over the same 3,395,000 shares of MarketAxess common stock.

What percentage of MarketAxess (MKTX) common stock is held by North Reef Capital?

North Reef Capital and its affiliates report holding 9.55% of MarketAxess common stock. This percentage is based on their beneficial ownership of 3,395,000 shares, with no sole voting power and full shared voting and dispositive power over those shares.

Does North Reef Capital have sole or shared voting power over its MKTX shares?

The filers report 0 shares with sole voting power and 3,395,000 shares with shared voting power. They likewise report 0 shares with sole dispositive power and 3,395,000 shares with shared dispositive power over MarketAxess common stock.

What class of MarketAxess (MKTX) securities is covered by this Schedule 13G/A?

The filing covers common stock, $0.003 par value, of MarketAxess Holdings Inc. identified by CUSIP 57060D108. The reported position of 3,395,000 shares and 9.55% of the class all relate to this common stock.

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

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Accepted by SEC EDGAR 08/14/2026 - 04:00 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Marketaxess Holdings Inc

(Name of Issuer)

Common Stock, $0.003 par value

(Title of Class of Securities)

57060D108

(CUSIP Number)

06/30/2026

(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

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 3,395,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,395,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,395,000.00

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)

9.55 %

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 3,395,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,395,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,395,000.00

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)

9.55 %

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 3,395,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,395,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,395,000.00

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)

9.55 %

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 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: 3,395,000
(b)	Percent of class: 9.55 %
(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: 3,395,000
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 3,395,000
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:	08/14/2026

North Reef Capital Management GP LLC

Signature:	/s/ James Hanna, III
Name/Title:	Managing Member
Date:	08/14/2026

James Hanna, III

Signature:	/s/ James Hanna, III
Name/Title:	James Hanna, III
Date:	08/14/2026

Exhibit Information

EXHIBIT 99.1 - JOINT FILING AGREEMENT