Steven B. Klinsky - 10 Mar 2026 SCHEDULE 13D/A Report for New Mountain Finance Corporation Common Stock, par value $0.01 per share (NMFC)

Filing manager: Steven B. Klinsky
Reporting owner: KLINSKY STEVEN B
Security: New Mountain Finance Corporation Common Stock, par value $0.01 per share
Beneficially owned shares: 12,330,154 shares
Large-stake signal: Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Ownership
13%
Beneficial ownership of this reported class.
Shares
12,330,154 shares
Shares beneficially owned as disclosed.
Event date
10 Mar 2026
Date tied to the ownership event or amendment.
Accepted by SEC
12 Mar 2026
EDGAR acceptance date.
How to read this large-stake filing
Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
Compare this filing with the holder history and issuer page before treating the percentage as a current position.
Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership: 13%
Symbol: NMFC
Shares outstanding: 98,483,657 shares
SEC form: SCHEDULE 13D/A
Accepted by SEC: 12 Mar 2026, 17:22:10 UTC
Event date: 10 Mar 2026
Prior SEC filing: 03 Mar 2026
Source filing: View source filing

Key filing fact

Steven B. Klinsky disclosed 13% ownership in New Mountain Finance Corporation Common Stock, par value $0.01 per share (NMFC) on 10 Mar 2026.

Key facts

Steven B. Klinsky filed SCHEDULE 13D/A for New Mountain Finance Corporation Common Stock, par value $0.01 per share (NMFC).
Disclosed ownership: 13%.
Date of event: 10 Mar 2026.

This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

Reporting persons

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name	Ownership	Shares owned	Sole voting power	Shared voting power	Signature	Title	CIK
KLINSKY STEVEN B	13%	12,330,154	9,800,061	2,530,093	/s/ Steven B. Klinsky	Steven B. Klinsky	0001018327
STEVEN B. KLINSKY 2008 LONG TERM TRUST	1.5%	1,465,110	0	1,465,110	/s/ Steven B. Klinsky	Steven B. Klinsky, Authorized Person
STEVEN B. KLINSKY NON-GST EXEMPT TRUST	1%	1,020,267	0	1,020,267	/s/ Steven B. Klinsky	Steven B. Klinsky, Authorized Person
STEVEN B. KLINSKY 2024 REVOCABLE TRUST (2024 TRUST 1)	5.4%	5,370,858	5,370,858	0	/s/ Steven B. Klinsky	Steven B. Klinsky, Authorized Person
STEVEN B. KLINSKY 2024 REVOCABLE TRUST (2024 TRUST 2)	3.5%	3,457,379	3,457,379	0	/s/ Steven B. Klinsky	Steven B. Klinsky, Authorized Person
STEVEN B. KLINSKY 2024 REVOCABLE TRUST (2024 TRUST 3)	0.87%	855,000	855,000	0	/s/ Steven B. Klinsky	Steven B. Klinsky, Authorized Person
Weinstein Adam B.	0.75%	738,856	738,856	0	/s/ Adam B. Weinstein	Adam B. Weinstein	0001515170

CIK / CUSIP context first

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