American Securities LLC holds a concentrated book of 2 reported positions worth $3.9B as of Q1 2026 (disclosed May 14, 2026, a ~44-day 13F lag). This quarter Solv Energy Inc-CL A first appears in 13F filings, a listing rather than a purchase. Their largest long position is Solv Energy Inc-CL A at 70% of the reported non-option book. Cloning the disclosed picks since 2015 would be +148% (+8.2%/yr). That is a simulation of the disclosed long book, not audited returns.
Following at the filing date actually beat the quarter-end book by 62.7 points over this window.
Growth of $10,000 cloning American Securities LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~44 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: concentrated book
Excluding Solv Energy Inc-CL A (70% of the book), the rest is a concentrated book:
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
100% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
No buys this quarter.
No trims or exits this quarter.
Other tracked managers holding the same core names as American Securities LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| CenterBook Partners LP | 2 / 2 | $13.2M |
| Hel Ved Capital Management Ltd | 2 / 2 | $7.4M |
| Cinctive Capital Management LP | 2 / 2 | $12.8M |
| Atom Investors LP | 2 / 2 | $4.0M |
| George Soros | 2 / 2 | $17.3M |
| Boothbay Fund Management, LLC | 2 / 2 | $8.3M |
| ExodusPoint Capital Management, LP | 2 / 2 | $12.0M |
| Walleye Capital LLC | 2 / 2 | $19.1M |
Ranked by the share of each fund's own book sitting in the names it shares with American Securities LLC: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | SOLV Energy Inc Class A Common Stock | $2.8B | 91.77M | 70.1% | →Listed Newly reportable | |
| 2 | Amentum Holdings, Inc. Common Stock | $1.2B | 45.03M | 29.9% | —Held |
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1475483/holdings"
Use Arkolith to show AMERICAN SECURITIES LLC's latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter, log scale (the range spans more than 20x). Raw filing totals can include option notional.
| Quarter | As of | Filed | Lag | Positions | Value | Form |
|---|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 14, 2026 | 44d | 2 | $3.9B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 12, 2026 | 43d | 1 | $1.3B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 7, 2025 | 38d | 1 | $1.1B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 29, 2025 | 29d | 1 | $1.1B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 12, 2025 | 42d | 1 | $798.9M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 14, 2025 | 45d | 1 | $923.1M | 13F-HR/A |
| Q3 2024 | Sep 30, 2024 | Nov 12, 2024 | 43d | 1 | $0 | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 12, 2024 | 43d | 1 | $0 | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 14, 2024 | 44d | 1 | $0 | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 13, 2024 | 44d | 1 | $109.0M | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 14, 2023 | 45d | 1 | $139.7M | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 4, 2023 | 35d | 1 | $175.5M | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 15, 2023 | 45d | 1 | $194.7M | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 13, 2023 | 44d | 1 | $102.1M | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 14, 2022 | 45d | 1 | $79.6M | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 13, 2022 | 43d | 1 | $179.4M | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 14, 2022 | 45d | 1 | $149.1M | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 15, 2021 | 46d | 1 | $198.8M | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 16, 2021 | 47d | 1 | $236.9M | 13F-HR/A |
| Q1 2021 | Mar 31, 2021 | May 12, 2021 | 42d | 1 | $238.5M | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 4, 2021 | 35d | 1 | $201.4M | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 12, 2020 | 43d | 1 | $134.1M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. Disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.