Kayne Anderson/Sabinal Disclose 19,187,581 MNR Units in Initial Form 3

Rhea-AI Filing Summary

MACH Natural Resources LP (MNR) received an initial Form 3 disclosing that Kayne Anderson Capital Advisors L.P. and related entity Sabinal Energy Operating, LLC reported indirect beneficial ownership of 19,187,581 common units. The report lists the event date as 09/16/2025 and signatures on the filing dated 09/22/2025. Kayne Anderson states these units are held by Sabinal Energy Operating, LLC, a portfolio company of a private investment fund managed by Kayne Anderson. Both reporting persons are identified as Director and as a 10% owner of the issuer.

Positive

• Initial Section 16 disclosure filed, establishing regulatory transparency for significant ownership
• 19,187,581 common units reported as indirect beneficial ownership, indicating a sizable institutional stake
• Clear identification of the relationship: units held by Sabinal Energy Operating, LLC, a portfolio company managed by Kayne Anderson

Negative

• None.

Insights

Securities Analyst

TL;DR: A registered investment manager and its portfolio entity disclosed indirect ownership above 10%, establishing an institutional stake in MNR.

The Form 3 shows Kayne Anderson Capital Advisors L.P. and Sabinal Energy Operating, LLC beneficially own 19,187,581 common units of MACH Natural Resources LP via indirect ownership. The filing is an initial Section 16 disclosure triggered by the 09/16/2025 event date, with signatures dated 09/22/2025. This establishes a reportable institutional position and the filing meets Section 16 initial reporting requirements; it does not include transfers, derivative positions, or transaction prices.

Corporate Governance Expert

TL;DR: Form 3 confirms governance visibility and a greater-than-10% ownership threshold by an affiliated portfolio company.

The document identifies both reporting entities as directors and 10% owners, indicating governance interest and significant shareholding disclosure. The units are held indirectly by Sabinal Energy Operating, LLC, described as a portfolio company of a fund managed by Kayne Anderson. The filing contains no amendments, no derivative holdings, and no additional explanatory detail beyond the ownership statement.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

KAYNE ANDERSON CAPITAL ADVISORS LP

(Last) (First) (Middle)

2121 AVENUE OF THE STARS

9TH FLOOR

(Street)

LOS ANGELES CA 90067

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/16/2025

3. Issuer Name and Ticker or Trading Symbol
MACH NATURAL RESOURCES LP [ MNR ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Units	19,187,581	I(1)	Sabinal Energy Operating, LLC

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

KAYNE ANDERSON CAPITAL ADVISORS LP

(Last) (First) (Middle)

2121 AVENUE OF THE STARS

9TH FLOOR

(Street)

LOS ANGELES CA 90067

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Sabinal Energy Operating, LLC

(Last) (First) (Middle)

717 TEXAS AVENUE, SUITE 2200

(Street)

HOUSTON TX 77002

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. The reported units are held by Sabinal Energy Operating, LLC, a portfolio company of a private investment fund managed by Kayne Anderson Capital Advisors, L.P.

	/s/ Michael O'Neil	09/22/2025
	/s/ Oren Marouni	09/22/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did the Form 3 for MACH Natural Resources LP (MNR) disclose?

The Form 3 disclosed that Kayne Anderson Capital Advisors L.P. and Sabinal Energy Operating, LLC indirectly beneficially own 19,187,581 common units of MNR.

When was the event requiring the Form 3 reported for MNR?

The event date reported on the Form 3 is 09/16/2025, with signatures on the filing dated 09/22/2025.

How is the reported ownership held according to the filing?

The filing states the units are held indirectly by Sabinal Energy Operating, LLC, a portfolio company of a private investment fund managed by Kayne Anderson.

Does the Form 3 report any derivative securities or transactions for MNR?

No. Table II for derivative securities is blank and the filing reports only non-derivative common units.

Did the reporting persons indicate their relationship to MNR?

Yes. Both Kayne Anderson Capital Advisors L.P. and Sabinal Energy Operating, LLC are marked as Director and as a 10% owner in the filing.