SEC FORM 4

SEC FORM 4 SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KLINSKY STEVEN B

(Last)

(First)

(Middle)

C/O NEW MOUNTAIN CAPITAL, L.L.C.

1633 BROADWAY, 48TH FLOOR

(Street)

NEW YORK

10019

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
New Mountain Finance Corp [ NMFC ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
09/16/2025

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock								109,251.61⁽¹⁾	D
Common Stock	09/16/2025		P		21,339	A	$9.7813	965,111	I	See Note⁽²⁾
Common Stock								1,020,267	I	See Note⁽³⁾
Common Stock								11,191	I	See Note⁽⁴⁾
Common Stock								11,175	I	See Note⁽⁵⁾
Common Stock								11,175	I	See Note⁽⁶⁾
Common Stock								11,175	I	See Note⁽⁷⁾
Common Stock	09/16/2025		P		85,352	A	$9.7813	4,370,857	I	See Note⁽⁸⁾
Common Stock								3,457,379	I	See Note⁽⁹⁾
Common Stock								855,000	I	See Note⁽¹⁰⁾

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Includes shares previously acquired under the New Mountain Finance Corporation dividend reinvestment plan.

2. The Steven B. Klinsky 2008 Long Term Trust directly owns these shares. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

3. The Steven B. Klinsky Non-GST Exempt Trust directly owns these shares. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

4. Includes (i) 16 shares held directly and (ii) 11,175 shares held indirectly through a trust by an immediate family member of the reporting person. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

5. Shares are held indirectly through a trust by an immediate family member of the reporting person. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

6. Shares are held indirectly through a trust by an immediate family member of the reporting person. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

7. Shares are held indirectly through a trust by an immediate family member of the reporting person. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

8. The Steven B. Klinsky 2024 Revocable Trust ("2024 Trust 1") directly owns these shares. The reporting person disclaims beneficial ownership held by 2024 Trust 1 except to the extent of his pecuniary interest therein.

9. The Steven B. Klinsky 2024 Revocable Trust ("2024 Trust 2") directly owns these shares. The reporting person disclaims beneficial ownership held by 2024 Trust 2 except to the extent of his pecuniary interest therein.

10. The Steven B. Klinsky 2024 Revocable Trust ("2024 Trust 3") directly owns these shares. The reporting person disclaims beneficial ownership held by 2024 Trust 3 except to the extent of his pecuniary interest therein.

	/s/ Steven B. Klinsky	09/18/2025
	** 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 4 (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.

Director Klinsky Steven B bought $1,043,577 worth of shares (106,691 units at $9.78) (SEC Form 4)