SEC 13F Intelligence

Managers / Q3 2023 · view latest →

BRIGHTLINE CAPITAL MANAGEMENT, LLC

CIK 0001432450 · 2 S. BISCAYNE BOULEVARD, SUITE 2580, MIAMI, FL, 33131 · 305-423-0834

Reported Value
$24M
Q3 2023
Positions
4
Filings on Record
30
2019–present window
Filed
Oct 31, 2023
original filing

Summary

Brightline Capital Management, LLC reported $24M in U.S.-listed holdings across 4 positions for Q3 2023.

The portfolio is heavily concentrated: MBC alone accounts for 46.5% of reported value.

Compared with Q2 2023, the fund opened 3 new positions and exited 0.

Portfolio Metrics

Turnover
0.0%
vs prior filed quarter
Largest Position
+46.5%
Masterbrand

Methodology: turnover is min(value bought, value sold) ÷ average reported value across the two quarters — value-based, so market moves inflate it slightly versus a share-based measure. Concentration and largest position are shares of the filing’s total reported value, options excluded. New/exited counts compare against the prior filed quarter. All figures derive solely from the fund’s 13F filings.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $18MQ4 ’18Q1 ’19: $63MQ2 ’19: $95MQ1 ’20: $0Q2 ’20: $26.4BQ2 ’20Q4 ’20: $132MQ1 ’21: $148MQ2 ’21: $149MQ3 ’21: $140MQ3 ’21Q4 ’21: $163MQ1 ’22: $143MQ2 ’22: $43MQ3 ’22: $50MQ3 ’22Q4 ’22: $45MQ1 ’23: $0Q2 ’23: $9MQ3 ’23: $24MQ3 ’23Q4 ’23: $92MQ1 ’24: $166MQ2 ’24: $201MQ3 ’24: $237MQ3 ’24Q4 ’24: $146MQ1 ’25: $115MQ2 ’25: $232MQ3 ’25: $244MQ3 ’25Q4 ’25: $247MQ1 ’26: $338Mfilingsflow.com

Portfolio Composition

By security type
Common Stock: 64.1%Other: 35.9%
  • Common Stock · 64.1% · $16M
  • Other · 35.9% · $9M

Quarter-over-Quarter Changes full breakdown →

vs Q2 2023 (amended baseline)

IssuerMoveShare ΔShares nowValue ΔValue now
CONSTELLIUM SENEW+482.0K482.0K+$9M$9M
DOORUSDMASONITE INTL CORPNEW+26.0K26.0K+$2M$2M
HDSNHUDSON TECHNOLOGIES INCNEW+140.0K140.0K+$2M$2M
MBCMASTERBRAND INCADDED+185.0K935.0K+$3M$11M

Value changes conflate price moves with buying and selling — share changes are the real signal. Share counts are not split-adjusted.

Holdings — Q3 2023

4 positions
Export to Excel
#IssuerClass% PortfolioValue ↓Shares
1MBCMASTERBRAND INChistory →COMMON STOCK46.52%$11M935.0K
2CONSTELLIUM SECL A SHS35.93%$9M482.0K
3DOORUSDMASONITE INTL CORPhistory →COM9.93%$2M26.0K
4HDSNHUDSON TECHNOLOGIES INChistory →COM7.63%$2M140.0K

Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$338M9May 15, 202613F-HRchanges · EDGAR ↗
Q4 2025$247M8Feb 13, 202613F-HRchanges · EDGAR ↗
Q3 2025$244M10Nov 13, 202513F-HRchanges · EDGAR ↗
Q2 2025$232M15Aug 14, 202513F-HRchanges · EDGAR ↗
Q1 2025$115M12May 14, 202513F-HRchanges · EDGAR ↗
Q4 2024$146M13Feb 13, 202513F-HRchanges · EDGAR ↗
Q3 2024$237M20Nov 13, 202413F-HRchanges · EDGAR ↗
Q2 2024$201M19Aug 13, 202413F-HRchanges · EDGAR ↗
Q1 2024$166M15May 14, 202413F-HRchanges · EDGAR ↗
Q4 2023$92M10Feb 14, 202413F-HRchanges · EDGAR ↗
Q3 2023$24M4Oct 31, 202313F-HRchanges · EDGAR ↗
Q2 2023$9M1Aug 11, 202313F-HRchanges · EDGAR ↗
Q1 2023$01May 5, 202313F-HRchanges · EDGAR ↗
Q4 2022$45M5Feb 3, 202313F-HRchanges · EDGAR ↗
Q3 2022$50M5Nov 9, 202213F-HRchanges · EDGAR ↗
Q2 2022$43M4Aug 3, 202213F-HRchanges · EDGAR ↗
Q1 2022$143M9May 12, 202213F-HRchanges · EDGAR ↗
Q4 2021$163M13Feb 7, 202213F-HRchanges · EDGAR ↗
Q3 2021$140M12Nov 8, 202113F-HRchanges · EDGAR ↗
Q2 2021$149M11Aug 9, 202113F-HRchanges · EDGAR ↗
Q1 2021$148M13May 12, 202113F-HRchanges · EDGAR ↗
Q4 2020$132M15Feb 9, 202113F-HRchanges · EDGAR ↗
Q3 2020Under review11Nov 10, 202013F-HRchanges · EDGAR ↗
Q2 2020$26.4B6Aug 4, 202013F-HRchanges · EDGAR ↗
Q1 2020$01May 5, 202013F-HRchanges · EDGAR ↗
Q4 2019Under review10Feb 6, 202013F-HRchanges · EDGAR ↗
Q3 2019Under review13Nov 12, 201913F-HRchanges · EDGAR ↗
Q2 2019$95M11Aug 12, 201913F-HRchanges · EDGAR ↗
Q1 2019$63M11May 9, 201913F-HRchanges · EDGAR ↗
Q4 2018$18M2Feb 8, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.