Arkolith/Funds/Brightline Capital Management, LLC

Brightline Capital Management, LLC

CIK 1432450
Holdings as of Jun 30, 2026·disclosed Aug 14, 2026·~45-day 13F lag·13F-HR
Active Filer

Brightline Capital Management, LLC holds a concentrated book of 11 reported positions worth $461.5M as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter Trekor Metals Ltd first appears in 13F filings, a listing rather than a purchase; they opened Herc Holdings Inc. Their largest long position is Viasat Inc at 41% of the reported non-option book. Cloning the disclosed picks since 2018 would be +213% (+14.2%/yr). That is a simulation of the disclosed long book, not audited returns.

Opened
4
bought for the first time
+1 more · largest first
1 newly reportable · first quarter we see the security in 13F filings, a listing not a purchase
Added to
6
already held, bought more
+3 more · largest first
Trimmed
0
sold some, still holds it
no trims
Sold out
3
exited the position entirely

Growth of $10,000: cloning the disclosed book

If you'd copied them
+212.8%
+14.2%/yr · since Feb '18
Their reported book
+230.3%
held from quarter-end
S&P 500
+234.0%
same window
$4K$13K$21K$29K$38KFeb '18Sep '19Aug '21Mar '23Feb '25Sep '26
Brightline Capital Management, LLC (copied at disclosure) S&P 500

The reported book (valued from quarter-end) returned +230.3%, a 17.5-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.

How much sits in the biggest positions

Top-heavy: concentrated book

Top 5 holdings
79%
Top 10 holdings
99%
Top 20 holdings
100%

Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.

Where the money is, by sector

100% mapped to company sectors

Communication Services
41%
Materials
29%
Industrials
23%
Consumer Discretionary
7%

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.

Biggest moves: latest quarter

Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis

Bought
Trimmed / exited
Newly reportable· first quarter we see the security in 13F filings · position value, not a trade

Funds with the most overlap

Other tracked managers holding the same core names as Brightline Capital Management, LLC

Manager / fundShared namesTheir $ in those
Kerrisdale Advisers, LLC2 / 11$110.6M
Coliseum Capital Management, LLC2 / 11$285.7M
Lodge Hill Capital, LLC2 / 11$70.0M
Tiptree Advisors, LLC2 / 11$16.4M
JB Capital Partners LP2 / 11$53.9M
Cramer Rosenthal McGlynn LLC2 / 11$140.4M
Lee Danner & Bass Inc2 / 11$77.6M
BDF-Gestion2 / 11$31.5M

Ranked by the share of each fund's own book sitting in the names it shares with Brightline Capital Management, 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.

Holdings: largest first

Bars show each position's share of the portfolio. Click a row for its position history.

11 positions
#SecurityValueShares% PortLast moveHistory
1Viasat Inc
COM
$189.7M2.11M
41.1%
▲+0.6%
Added · +12K sh
2Constellium SE
CL A SHS
$61.3M1.92M
13.3%
▲+4.1%
Added · +76K sh
3Regal Rexnord Corporation
COM
$38.8M163.0K
8.4%
▲+30%
Added · +38K sh
4Fluor Corp
COM
$37.9M723.0K
8.2%
▲+20%
Added · +122K sh
5Ecovyst Inc
COM
$37.5M3.01M
8.1%
▲+7.6%
Added · +212K sh
6Dana Inc
COM
$31.6M1.16M
6.8%
▲+0.9%
Added · +10K sh
7Herc Hldgs Inc
COM
$20.4M142.0K
4.4%
▲New
New position
8Trekor Metals Ltd
COM
$15.1M2.20M
3.3%
→Listed
Newly reportable
9Owens Corning New
COM
$12.7M80.0K
2.8%
▲New
New position
10Willscot Hldgs Corp
COM CL A
$9.9M342.0K
2.1%
▲New
New position
11Algoma STL Group Inc
COM
$6.7M1.66M
1.5%
▲New
New position
Showing all 11 positions
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Filing history

As-of date vs the date the SEC received each filing

$461.5M · Q2 2026Q3 2020 · $82.4MQ2 2026 · $461.5M

Reported 13F total per quarter, log scale (the range spans more than 20x). Raw filing totals can include option notional.

QuarterAs ofFiledLagPositionsValueForm
Q2 2026Jun 30, 2026Aug 14, 202645d11$461.5M13F-HR
Q1 2026Mar 31, 2026May 15, 202645d9$338.1M13F-HR
Q4 2025Dec 31, 2025Feb 13, 202644d8$247.4M13F-HR
Q3 2025Sep 30, 2025Nov 13, 202544d10$244.0M13F-HR
Q2 2025Jun 30, 2025Aug 14, 202545d15$232.2M13F-HR
Q1 2025Mar 31, 2025May 14, 202544d12$115.3M13F-HR
Q4 2024Dec 31, 2024Feb 13, 202544d13$145.8M13F-HR
Q3 2024Sep 30, 2024Nov 13, 202444d20$236.8M13F-HR
Q2 2024Jun 30, 2024Aug 13, 202444d19$201.5M13F-HR
Q1 2024Mar 31, 2024May 14, 202444d15$166.2M13F-HR
Q4 2023Dec 31, 2023Feb 14, 202445d10$92.2M13F-HR
Q3 2023Sep 30, 2023Oct 31, 202331d4$24.4M13F-HR
Q2 2023Jun 30, 2023Aug 11, 202342d1$8.7M13F-HR
Q1 2023Mar 31, 2023May 5, 202335d1$013F-HR
Q4 2022Dec 31, 2022Feb 3, 202334d5$45.4M13F-HR
Q3 2022Sep 30, 2022Nov 9, 202240d5$49.7M13F-HR
Q2 2022Jun 30, 2022Aug 3, 202234d4$43.1M13F-HR
Q1 2022Mar 31, 2022May 12, 202242d9$143.1M13F-HR
Q4 2021Dec 31, 2021Feb 7, 202238d13$162.8M13F-HR
Q3 2021Sep 30, 2021Nov 8, 202139d12$139.8M13F-HR
Q2 2021Jun 30, 2021Aug 9, 202140d11$148.6M13F-HR
Q1 2021Mar 31, 2021May 12, 202142d13$148.2M13F-HR
Q4 2020Dec 31, 2020Feb 9, 202140d15$132.5M13F-HR
Q3 2020Sep 30, 2020Nov 10, 202041d11$82.4M13F-HR

Data source

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.