BRIGHTLINE CAPITAL MANAGEMENT, LLC
Long book
$338.1M
Q1 2026
Positions
9
Top-10 weight
100%
concentration
Last quarter
+25.6%
SPY +14.8%
Turnover
30%
of book per quarter
Strategy in plain words
auto-generated from filingsBRIGHTLINE CAPITAL MANAGEMENT, LLC is a concentrated fundamental stock-picker, running a $338.1M US long book across 9 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The portfolio is actively managed, with meaningful quarterly turnover. Current anchor positions: VIASAT INC, CONSTELLIUM SE, DANA INC, AMENTUM HOLDINGS INC, ECOVYST INC.
Over the last 9 quarters its long book ran on average 7.3pp per quarter ahead of the S&P 500, beating the index in 6 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
-8.4%
Q2 2024
+9.4%
Q3 2024
-5.0%
Q4 2024
-20.1%
Q1 2025
+32.4%
Q2 2025
+33.2%
Q3 2025
+16.1%
Q4 2025
+22.6%
Q1 2026
+25.6%
Sector allocation
Industrials 46%
Communications 28%
Services media 11%
Materials 11%
Other 4%
Long book by quarter
What does BRIGHTLINE CAPITAL own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| VSAT VIASAT INC | Communications | 2.1M | $96.2M | 28.4% | +0.3% |
| CSTM CONSTELLIUM SE | Industrials | 1.8M | $45.4M | 13.4% | +0.3% |
| DAN DANA INC | Industrials | 1.1M | $38.7M | 11.4% | +0.3% |
| AMTM AMENTUM HOLDINGS INC | Services media | 1.4M | $36.4M | 10.8% | +0.3% |
| ECVT ECOVYST INC | Materials | 2.8M | $36.0M | 10.6% | +36.6% |
| FLR FLUOR CORP | Industrials | 601.0K | $28.0M | 8.3% | +7.5% |
| RRX REGAL REXNORD CORP | Industrials | 125.0K | $23.4M | 6.9% | New |
| KALU KAISER ALUMINUM CORP | Industrials | 175.0K | $21.1M | 6.2% | +4.2% |
| UDM TASEKO MINES LTD | — | 2.0M | $12.9M | 3.8% | New |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 15, 2026 | 9 | $338.1M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 13, 2026 | 8 | $247.4M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 13, 2025 | 10 | $244.0M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 15 | $232.2M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 14, 2025 | 12 | $115.3M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 13, 2025 | 13 | $145.8M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 13, 2024 | 20 | $236.8M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 13, 2024 | 19 | $201.5M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 14, 2024 | 15 | $166.2M | canonical | SEC ↗ |
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