# EDGAR Filing Document

**Accession Number:** 0001496099
**File Stem:** 0001140361-23-010706
**Filing Date:** 2023-3
**Character Count:** 2103
**Document Hash:** b8c728144fa8a60f0e71ada7f23e6415
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-23-010706.hdr.sgml**: 20230308

**ACCESSION NUMBER**: 0001140361-23-010706

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230308

**DATE AS OF CHANGE**: 20230308

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** New Mountain Finance Corp
- **CENTRAL INDEX KEY:** 0001496099
- **IRS NUMBER:** 272978010
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 814-00832
- **FILM NUMBER:** 23716876

**BUSINESS ADDRESS:**
- **STREET 1:** 1633 BROADWAY
- **STREET 2:** 48TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 2127300200

**MAIL ADDRESS:**
- **STREET 1:** 1633 BROADWAY
- **STREET 2:** 48TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** New Mountain Guardian Corp
- **DATE OF NAME CHANGE:** 20100706

### UNITED STATES<br>

### SECURITIES AND EXCHANGE COMMISSION<br>

### Washington, D.C. 20549

### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of<br>

#### the Securities Exchange Act of 1934 (Amendment No.)
Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐<br> Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

&nbsp;&nbsp;&nbsp;&nbsp;☒ Definitive Additional Materials

☐<br> Soliciting Material under §240.14a-12

### New Mountain Finance Corporation
(Name of Registrant as Specified In Its Charter)<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒ No fee required. <br> ☐ Fee paid previously with preliminary materials. <br> ☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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