New Mountain Capital, L.L.C.
Long book
$109.8M
Q1 2026
Positions
1
Top-10 weight
100%
concentration
Last quarter
+31.6%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsNew Mountain Capital, L.L.C. is a diversified fundamental manager, specialised in healthcare (100% of the long book), running a $109.8M US long book across 1 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: AVANTOR INC.
Over the last 9 quarters its long book ran on average 12.2pp per quarter behind the S&P 500, beating the index in 2 of 9 quarters. We rate its filings as signal-bearing: position changes reflect genuine views.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-17.1%
Q2 2024
+22.0%
Q3 2024
-18.6%
Q4 2024
-23.1%
Q1 2025
-17.0%
Q2 2025
-7.3%
Q3 2025
-8.2%
Q4 2025
-31.6%
Q1 2026
+31.6%
Sector allocation
Healthcare 100%
Long book by quarter
What does New Mountain own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| AVTR AVANTOR INC | Healthcare | 14.0M | $109.8M | 100.0% | Held |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 13, 2026 | 1 | $109.8M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 17, 2026 | 1 | $160.4M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 14, 2025 | 1 | $174.7M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 1 | $188.4M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 15, 2025 | 1 | $226.9M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 13, 2025 | 1 | $295.0M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 14, 2024 | 2 | $1.71B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 14, 2024 | 2 | $1.49B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 15, 2024 | 2 | $1.57B | canonical | SEC ↗ |