Trusts tied to New Mountain Finance (NMFC) director buy 500K shares

Rhea-AI Filing Summary

New Mountain Finance Corp director and 10% owner Steven B. Klinsky reported a net purchase of 500,000 shares of Common Stock in open-market transactions at $8.05 per share on March 10 and 11, 2026. These shares are held indirectly through various trusts and related entities, and the filing notes that Klinsky disclaims beneficial ownership except for his pecuniary interest. The Form 4 also lists updated direct and indirect share balances for multiple trusts and family-related accounts.

Insights

Insider transactions analyst

Entities tied to a major insider made sizeable open‑market share purchases.

Entities associated with director and 10% owner Steven B. Klinsky bought a combined 500,000 shares of New Mountain Finance Corp common stock in open-market trades at $8.05 per share over March 10–11, 2026. All reported trades are non-derivative common stock purchases.

The ownership is reported as indirect, largely through multiple trusts and family-related vehicles, and Klinsky disclaims beneficial ownership beyond his pecuniary interest. No derivative positions are shown, and there are no same-date sales, so this filing reflects a straightforward net increase in indirectly held shares.

The filing does not show how these purchases compare with total shares outstanding, so the overall impact on ownership concentration cannot be assessed from this data alone. Subsequent company filings may provide broader context on total capital structure and insider ownership levels.

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

OMB APPROVAL

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

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock								116,823.91(1)	D
Common Stock	03/10/2026		P		74,586	A	$8.05	1,373,030	I	See Note(2)
Common Stock	03/11/2026		P		92,080	A	$8.05	1,465,110	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	03/10/2026		P		149,172	A	$8.05	5,186,696	I	See Note(8)
Common Stock	03/11/2026		P		184,162	A	$8.05	5,370,858	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

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.

	Steven B. Klinsky	03/12/2026
	** 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).
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FAQ

What insider transactions did NMFC report for Steven B. Klinsky on this Form 4?

The Form 4 reports that entities associated with director and 10% owner Steven B. Klinsky bought 500,000 shares of New Mountain Finance Corp common stock in open-market transactions at $8.05 per share on March 10 and 11, 2026, increasing their indirect holdings.

At what price were the NMFC shares purchased in the reported insider trades?

All reported insider purchases were executed at $8.05 per share. The filing shows four open-market transactions in New Mountain Finance Corp common stock on March 10 and 11, 2026, each using the same per-share purchase price for the non-derivative common stock.

Are the NMFC shares in this Form 4 held directly by Steven B. Klinsky?

Most reported shares are held indirectly through various trusts and family-related entities. The Form 4 states that these trusts directly own the shares and that Steven B. Klinsky disclaims beneficial ownership except to the extent of his pecuniary interest in those entities.

How many NMFC shares did the trusts and related entities buy in total?

The transaction summary shows total net purchases of 500,000 shares of New Mountain Finance Corp common stock. These were executed across four open-market buy transactions, all reported as indirect ownership through trusts and related entities, with no corresponding sales in this filing.

Does this NMFC Form 4 include any stock option exercises or derivative transactions?

No, the filing does not include any derivative transactions or option exercises. All reported trades are non-derivative common stock open-market purchases, and the derivative summary section shows zero derivative transaction count and zero derivative shares exercised or converted.

What ongoing NMFC shareholdings are disclosed for Steven B. Klinsky and related entities?

The Form 4 lists updated direct and indirect holdings, including balances such as 1,465,110 and 5,370,858 shares for certain indirect accounts, plus smaller trust and direct positions. These figures reflect post-transaction holdings for each entity rather than a single consolidated total position.