Brightline Capital Management portfolio
Concentrated managerInvestment firmPortfolio as of Jun 30, 2026 (Q2 2026) · filed with the SEC on Aug 14, 2026 · data updated on Nov 5, 2026 · Q2 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Brightline Capital Management reported a $462M portfolio of 11 positions to the SEC as of the end of Q2 2026. Its largest positions are VSAT, CSTM, RRX. During the quarter it opened Herc Holdings and Owens Corning and exited Amentum Holdings and Kaiser Aluminum.
Sections with a free account
What changed this quarter
11 positions with a change (4 new, 5 added to, 2 sold). 10 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Amentum Holdings−7.9 ppof portfolioSold out10.8% → —
- Kaiser Aluminum−4.6 ppof portfolioSold out6.2% → —
- Herc Holdings+4.4 ppof portfolioNew— → 4.4%
- Owens Corning+2.8 ppof portfolioNew— → 2.8%
- Willscot Holdings+2.1 ppof portfolioNew— → 2.1%
- Regal Rexnord+30%more sharesIncreased6.9% → 8.4%
- Algoma Steel Group+1.5 ppof portfolioNew— → 1.5%
- Fluor+20%more sharesIncreased8.3% → 8.2%
- Ecovyst+7.6%more sharesIncreased10.6% → 8.1%
- Constellium+4.1%more sharesIncreased13.4% → 13.3%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- ViasatVSAT41.1%
- ConstelliumCSTM13.3%
- Regal RexnordRRX8.4%
- FluorFLR8.2%
- EcovystECVT8.1%
- DanaDAN6.8%
- Herc HoldingsHRI4.4%
- Trekor MetalsTGB3.3%
- Owens CorningOC2.8%
- Willscot HoldingsWSC2.1%
- Algoma Steel GroupASTL1.5%
“Since”: first quarter of the current run, unbroken until today. In the details, prices are the quarter-end prices of the quarters in which it added shares, per the 13F. The manager may have bought at any price within each quarter; the SEC only publishes the value at quarter end.
Portfolio by sector
- ● Information Technology 41%
- ● Materials 26%
- ● Industrials 26%
- ● Consumer Discretionary 7%
How its portfolio changed (8 quarters)
Q2 2026: 11
Q2 2026: 99%
Q2 2026: 14.0%
Traded turnover: the weight it bought plus the weight it sold in the quarter, divided by two, excluding price moves. The plain “turnover” in the header does include that effect. With a free account: the full history and sectors over time.
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Investment firm, per its Form ADV of Mar 9, 2026 (high confidence).
The data, as reported: BRIGHTLINE CAPITAL MANAGEMENT, LLC (CRD 161661): 7.B private funds: 2 hedge (gross assets $346M); 5.D assets by client type: pooled vehicles 100% (of $346M)
The type comes from a rule applied to that data. If it looks wrong, tell us.
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