Institutional Manager · CIK 0001475483
AMERICAN SECURITIES LLC
NEW YORK, NY · File #028-15332
Latest AUM
$1.31B
Positions
1
Top-10 Concentration
100.0%
Filings
10
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| REDUCE | Amentum Holdings, Inc. | AMTM | 0 | $0 | +$227.4M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 20251 pos · $1.31B
- 13F HOLDINGS REPORTQ/E Sep 20251 pos · $1.08B
- 13F HOLDINGS REPORTQ/E Jun 20251 pos · $1.06B
- 13F HOLDINGS REPORTQ/E Mar 20251 pos · $798.9M
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20241 pos · $923.1M
- 13F HOLDINGS REPORTQ/E Dec 20241 pos · $0
- 13F HOLDINGS REPORTQ/E Sep 20241 pos · $0
- 13F HOLDINGS REPORTQ/E Jun 20241 pos · $0
- 13F HOLDINGS REPORTQ/E Mar 20241 pos · $0
- 13F HOLDINGS REPORTQ/E Dec 20231 pos · $139.7M
Top 1 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | Amentum Holdings, Inc. | AMTM | 45,026,743 | $1.31B | 100.00% |