New Mountain Capital, L.L.C.
- Regulatory AUM
- $46.4B
- Discretionary
- $46.4B
- Clients
- 14
- Avg AUM / client
- $3.3B
- Accounts
- 14
- Employees
- 235
AUM over time
Annual snapshots from Form ADV filings · as of Mar 30, 2026
Investments (13F portfolio — 1 positions, $109,760,000)
13F period Mar 31, 2026| # | Issuer | Class | Value | Shares | % of 13F | % of AUM |
|---|---|---|---|---|---|---|
| 1 | Avantor Inc | COM | $109,760,000 | 14,000,000 | 100.0% | 0.24% |
Top 25 of 1 positions from the manager's latest Form 13F · source filing (EDGAR) ↗. 13F covers long US-listed positions only. "% of AUM" is share of the firm's total regulatory AUM (Form ADV Item 5.F).
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Pooled investment vehicles (non-investment companies) | 14 | $46.4B | 100.0% |
Private funds (9)
Reported in Form ADV Section 7.B.(1), filing of Mar 2024 · $22.9B combined gross assets
| Fund | Type | Domicile | Gross assets | Owners |
|---|---|---|---|---|
| New Mountain Partners Vi, L.P. master | Private Equity Fund | Delaware | $9.7B | 284 |
| New Mountain Partners V, L.P. master | Private Equity Fund | Delaware | $8.4B | 257 |
| Nmp Iv Continuation Fund (D), L.P. | Private Equity Fund | Delaware | $1.2B | 10 |
| New Mountain Partners Iv, L.P. master | Private Equity Fund | Delaware | $1.2B | 170 |
| Nmp Iii Continuation Fund, L.P. master | Private Equity Fund | Delaware | $1.1B | 73 |
| New Mountain Strategic Equity Fund I, L.P. | Private Equity Fund | Delaware | $569M | 22 |
| New Mountain Partners Vi Luxembourg, Scsp | Private Equity Fund | Luxembourg | $431M | 54 |
| New Mountain Partners Iii, L.P. master | Private Equity Fund | Delaware | $196M | 209 |
| Nmp Iv Rollover Fund (D), L.P. | Private Equity Fund | Delaware | $73.2M | 32 |
People (3)
| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Klinsky, Steven, Bruce | Founder, Chief Executive Officer | Jul 1999 (27y) | 50% – 75% | |
| Weinstein, Adam | Managing Director, Chief Financial Officer | Jan 2015 (12y) | Less than 5% | |
| Hartswell, Joseph, Wesley | Managing Director And Chief Compliance Officer | Aug 2015 (11y) | Less than 5% |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| New Mountain Capital Group, L.P. | Member | Jul 1999 | A | 75% or more |
| Nm Partners Manager Holdings, L.P. | Limited Partner | Oct 2018 | B | ≈ 56.25% – 100% via New Mountain Capital Group, L.P. |
| Nm Holdings Gp, L.L.C. | General Partner | Oct 2018 | B | GP / trustee / elected manager of New Mountain Capital Group, L.P. (indirect) |
Estimated effective ownership (look-through of filed bands):
- Nm Partners Manager Holdings, L.P.: 75% – 100% of New Mountain Capital Group, L.P. × 75% – 100% direct ≈ 56.25% – 100% of the firm
Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.
Private funds (9, $22.9B gross assets)
| Fund | Type | Gross assets | Min. investment | Owners |
|---|---|---|---|---|
| New Mountain Partners Vi, L.P. | Private Equity Fund | $9.7B | $10.0M | 284 |
| New Mountain Partners V, L.P. | Private Equity Fund | $8.4B | $10.0M | 257 |
| Nmp Iv Continuation Fund (D), L.P. | Private Equity Fund | $1.2B | $10.0M | 10 |
| New Mountain Partners Iv, L.P. | Private Equity Fund | $1.2B | $10.0M | 170 |
| Nmp Iii Continuation Fund, L.P. | Private Equity Fund | $1.1B | $10.0M | 73 |
| New Mountain Strategic Equity Fund I, L.P. | Private Equity Fund | $569M | $10.0M | 22 |
| New Mountain Partners Vi Luxembourg, Scsp | Private Equity Fund | $431M | $10.0M | 54 |
| New Mountain Partners Iii, L.P. | Private Equity Fund | $196M | $10.0M | 209 |
| Nmp Iv Rollover Fund (D), L.P. | Private Equity Fund | $73.2M | $10.0M | 32 |
From Form ADV Section 7.B private fund reporting.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 03/30/2026 | 4.87 MB | View · PDF · Source ↗ |
Archived copies of the firm's regulatory filings, versioned by content hash.
Disciplinary disclosures
No disciplinary events reported on the firm's latest Form ADV filing.
How they charge
- • Percentage of assets under management
- • Performance-based fees
- • Other fees
- • TRANSACTION, ADVISORY AND BOARD FEES
Services
- • Portfolio management for pooled investment vehicles
- • Other services
Custody
Firm reports having custody of client funds or securities (Item 9.A).
No custodian data reported or mined yet.
Source
All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Mar 30, 2026.
View current Form ADV (SEC/IAPD) ↗