Brightline Capital Management, LLC holds a concentrated book of 9 stocks worth $338.1M as of Q1 2026 (disclosed May 15, 2026, a ~45-day 13F lag). This quarter they opened Regal Rexnord Corp. Their largest long position is Viasat Inc at 28% of the equity book. Cloning the disclosed picks since 2018 would be +263% (+16.4%/yr). That is a simulation of the disclosed long book, not audited returns.
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Use Arkolith to show BRIGHTLINE CAPITAL MANAGEMENT, LLC's latest holdings, largest changes, and filing provenance.
The reported book (valued from quarter-end) returned +360.8%, a 97.4-point gap that is the cost of the ~45-day 13F disclosure lag a real follower can't avoid.
Growth of $10,000 cloning Brightline Capital Management, LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~45 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
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, no cost basis
Other tracked managers holding the same core names as Brightline Capital Management, LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| BlackRock, Inc. | 10 / 9 | $5.1B |
| VANGUARD CAPITAL MANAGEMENT LLC | 10 / 9 | $1.8B |
| GEODE CAPITAL MANAGEMENT, LLC | 10 / 9 | $1.0B |
| MORGAN STANLEY | 10 / 9 | $641.0M |
| Nuveen, LLC | 10 / 9 | $613.5M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 10 / 9 | $492.2M |
| UBS Group AG | 10 / 9 | $448.8M |
| GOLDMAN SACHS GROUP INC | 10 / 9 | $393.9M |
Ranked by how many of Brightline Capital Management, LLC's top 9 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Viasat Inc COM | $96.2M | 2.10M | 28.4% | ▲+0.3% Added · +6K sh | |
| 2 | Constellium SE CL A SHS | $45.4M | 1.85M | 13.4% | ▲+0.3% Added · +5K sh | |
| 3 | Dana Inc COM | $38.7M | 1.15M | 11.4% | ▲+0.3% Added · +4K sh | |
| 4 | Amentum Holdings Inc COM | $36.4M | 1.40M | 10.8% | ▲+0.3% Added · +4K sh | |
| 5 | Ecovyst Inc COM | $36.0M | 2.80M | 10.6% | ▲+37% Added · +750K sh | |
| 6 | Fluor Corp New COM | $28.0M | 601.0K | 8.3% | ▲+7.5% Added · +42K sh | |
| 7 | Regal Rexnord Corporation COM | $23.4M | 125.0K | 6.9% | ▲New New position | |
| 8 | Kaiser Aluminum Corp COM PAR $0.01 | $21.1M | 175.0K | 6.2% | ▲+4.2% Added · +7K sh | |
| 9 | Taseko Mines Ltd COM | $12.9M | 2.00M | 3.8% | ▲New New position |
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 9 | $338.1M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 13, 2026 | 8 | $247.4M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 13, 2025 | 10 | $244.0M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 14, 2025 | 15 | $232.2M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 14, 2025 | 12 | $115.3M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 13, 2025 | 13 | $145.8M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 13, 2024 | 20 | $236.8M | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 13, 2024 | 19 | $201.5M | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 14, 2024 | 15 | $166.2M | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 14, 2024 | 10 | $92.2M | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Oct 31, 2023 | 4 | $24.4M | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 11, 2023 | 1 | $8.7M | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 5, 2023 | 1 | $0 | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 3, 2023 | 5 | $45.4M | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 9, 2022 | 5 | $49.7M | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 3, 2022 | 4 | $43.1M | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 12, 2022 | 9 | $143.1M | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 7, 2022 | 13 | $162.8M | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 8, 2021 | 12 | $139.8M | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 9, 2021 | 11 | $148.6M | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 12, 2021 | 13 | $148.2M | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 9, 2021 | 15 | $132.5M | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 10, 2020 | 11 | $82.4M | 13F-HR |
| Q2 2020 | Jun 30, 2020 | Aug 4, 2020 | 6 | $26.4M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; 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.