New Mountain Capital, L.L.C. — 13F Holdings & Portfolio
CIK 1407718 · latest 13F-HR filed 2026-05-13
New Mountain Capital, L.L.C. manages $109.8M in 13F-reported U.S. long-equity assets across 1 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are AVTR (100.00%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 0 new positions, exited 0, added to 0, and trimmed 1.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$109.8M
Long-equity book
1
Distinct positions
2026-03-31
Filed 2026-05-13
+0 / −0 / ↑0 / ↓1
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | AVANTOR INC | AVTR | 05352A100 | $109.8M | 100.00% | 14,000,000 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-13 | $109.8M | 1 | 0001172661-26-001765 |
| 2025-12-31 | 2026-02-17 | $160.4M | 1 | 0001172661-26-000966 |
| 2025-09-30 | 2025-11-14 | $174.7M | 1 | 0001172661-25-004866 |