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BEACONLIGHT CAPITAL, LLC — 13F Holdings & Portfolio

CIK 1569537 · latest 13F-HR filed 2026-08-14

Backtest portfolio

BEACONLIGHT CAPITAL, LLC manages $283.3M in 13F-reported U.S. long-equity assets across 33 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SPY (15.66%), SXT (9.65%), CSTM (8.78%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 12 new positions and exited 14; 9 existing positions rose in reported value and 10 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Loading holdings…
AUM
$283.3M

Long-equity book

Holdings
33

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+12 / −14 / ↑9 / ↓10

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
SXT12.0% · +79%CSTM10.9% · -33%NTRA6.4% · +59%SNOW6.0% · +190%LNG5.9% · +87%WERN5.3% · newSGI4.4% · +117%REZI4.4% · -46%JHX3.8% · +112%COMP3.5% · newTECK3.5% · -27%DAL3.4% · newKNX3.0% · newU2.7% · -38%TWLO2.7% · newBKD2.6% · newSRRK2.1% · newUAL2.1% · newRIG2.1% · +199%TNDM1.8% · +5%HUM1.4% · newVICR1.4% · -39%STM1.4% · -89%SKY1.3% · newDMRC1.2% · -22%GPOR1.1% · -55%ELV1.0% · newQDEL0.8% · -32%CELH0.8% · -62%VG0.6% · +61%TMDX0.5% · -64%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 62.6%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 30, 2026.

Assets Under Management
$445.3M
Discretionary
$445.3M
Employees
12
Accounts
5
Address
9 WEST 57TH STREET
27TH FLOOR
NEW YORK, NY 10019
Phone
(212) 612-3130
Website
Name Title / Status Ownership Type
BOSEK, EDWARD, DOMINIC ControlMANAGING MEMBER AND PORTFOLIO MANAGER
since Jul 2009
75% or moreIndividual
KRIEGER, MICHELE, AMY ControlCHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER / CHIEF OPERATING OFFICER
since Nov 2009
Less than 5%Individual
Ownership & leadership changes · 4 filings with changes since Feb 14, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Mar 29, 2018 filing
  • ChangedBOSEK, EDWARD, DOMINIC · title MANAGING MEMBER AND PORTFOLIO MANAGER, BEACONLIGHT CAPITAL, LLC / MANAGING MEMBER, BEACONLIGHT GP LLC → MANAGING MEMBER AND PORTFOLIO MANAGER
  • ChangedKRIEGER, MICHELE, AMY · title CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER / CHIEF OPERATING OFFICER, BEACONLIGHT CAPITAL, LLC → CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER / CHIEF OPERATING OFFICER
Mar 30, 2015 filing
  • No longer listedOHANA, NOAM, YOSSEF · MEMBER, BEACONLIGHT CAPITAL, LLC / MEMBER, BEACONLIGHT GP LLC · 10–25% · listed since Jul 2009
  • ChangedBOSEK, EDWARD, DOMINIC · title MANAGING MEMBER, BEACONLIGHT CAPITAL, LLC / MANAGING MEMBER, BEACONLIGHT GP LLC → MANAGING MEMBER AND PORTFOLIO MANAGER, BEACONLIGHT CAPITAL, LLC / MANAGING MEMBER, BEACONLIGHT GP LLC
Mar 31, 2014 filing
  • ChangedKRIEGER, MICHELE, AMY · title CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER, BEACONLIGHT CAPITAL, LLC → CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER / CHIEF OPERATING OFFICER, BEACONLIGHT CAPITAL, LLC
  • ChangedOHANA, NOAM, YOSSEF · title CHIEF OPERATING OFFICER, BEACONLIGHT CAPITAL, LLC / MEMBER / MEMBER, BEACONLIGHT GP LLC → MEMBER, BEACONLIGHT CAPITAL, LLC / MEMBER, BEACONLIGHT GP LLC; no longer a control person
Mar 28, 2013 filing
  • No longer listedMACLEAN, DUNCAN, RODERICK · MEMBER / RESEARCH ANALYST · 10–25% · listed since Oct 2010
  • ChangedBOSEK, EDWARD, DOMINIC · title MANAGING MEMBER → MANAGING MEMBER, BEACONLIGHT CAPITAL, LLC / MANAGING MEMBER, BEACONLIGHT GP LLC; ownership 50–75% → 75% or more
  • ChangedKRIEGER, MICHELE, AMY · title CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER → CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER, BEACONLIGHT CAPITAL, LLC
  • ChangedOHANA, NOAM, YOSSEF · title MEMBER / CHIEF OPERATING OFFICER → CHIEF OPERATING OFFICER, BEACONLIGHT CAPITAL, LLC / MEMBER / MEMBER, BEACONLIGHT GP LLC
Feb 14, 2012 filing (earliest on record)
  • ListedBOSEK, EDWARD, DOMINIC · MANAGING MEMBER · 50–75% · control person
  • ListedKRIEGER, MICHELE, AMY · CHIEF COMPLIANCE OFFICER / CHIEF FINANCIAL OFFICER · Less than 5% · control person
  • ListedMACLEAN, DUNCAN, RODERICK · MEMBER / RESEARCH ANALYST · 10–25%
  • ListedOHANA, NOAM, YOSSEF · MEMBER / CHIEF OPERATING OFFICER · 10–25% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

BEACONLIGHT CAPITAL, LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 STATE STR SPDR S&P 500 ETF T Put SPY 78462F103 $44.4M 15.66% 59,400 SH
2 SENSIENT TECHNOLOGIES CORP SXT 81725T100 $27.3M 9.65% 221,811 SH
3 CONSTELLIUM SE CSTM F21107101 $24.9M 8.78% 779,899 SH
4 NATERA INC NTRA 632307104 $14.5M 5.11% 53,312 SH
5 SNOWFLAKE INC SNOW 833445109 $13.5M 4.78% 53,180 SH
6 CHENIERE ENERGY INC LNG 16411R208 $13.3M 4.69% 55,621 SH
7 WERNER ENTERPRISES INC WERN 950755108 $12.0M 4.25% 276,026 SH
8 INVESCO QQQ TR Put QQQ 46090E103 $11.7M 4.13% 15,900 SH
9 SOMNIGROUP INTERNATIONAL INC SGI 88023U101 $10.1M 3.55% 128,310 SH
10 RESIDEO TECHNOLOGIES INC REZI 76118Y104 $10.0M 3.55% 322,960 SH
11 JAMES HARDIE INDS PLC JHX G4253H101 $8.5M 3.01% 326,195 SH
12 COMPASS INC COMP 20464U100 $8.0M 2.83% 649,901 SH
13 TECK RESOURCES LTD TECK 878742204 $8.0M 2.81% 133,807 SH
14 DELTA AIR LINES INC DAL 247361702 $7.7M 2.71% 81,820 SH
15 KNIGHT-SWIFT TRANSN HLDGS IN KNX 499049104 $6.9M 2.42% 88,047 SH
16 UNITY SOFTWARE INC U 91332U101 $6.1M 2.14% 212,475 SH
17 TWILIO INC TWLO 90138F102 $6.1M 2.14% 29,366 SH
18 BROOKDALE SR LIVING INC BKD 112463104 $5.9M 2.07% 364,976 SH
19 SCHOLAR ROCK HLDG CORP SRRK 80706P103 $4.8M 1.71% 87,893 SH
20 UNITED AIRLS HLDGS INC UAL 910047109 $4.8M 1.69% 35,175 SH
21 TRANSOCEAN LTD RIG H8817H100 $4.8M 1.69% 977,964 SH
22 TANDEM DIABETES CARE INC TNDM 875372203 $4.0M 1.42% 266,009 SH
23 HUMANA INC HUM 444859102 $3.3M 1.15% 8,220 SH
24 VICOR CORP VICR 925815102 $3.1M 1.10% 8,218 SH
25 STMICROELECTRONICS N V STM 861012102 $3.1M 1.09% 41,332 SH
26 CHAMPION HOMES INC SKY 830830105 $3.0M 1.06% 34,056 SH
27 DIGIMARC CORP DMRC 25382K100 $2.8M 0.98% 338,948 SH
28 GULFPORT ENERGY CORP GPOR 402635502 $2.6M 0.92% 15,325 SH
29 ELEVANCE HEALTH INC FORMERLY ELV 036752103 $2.3M 0.81% 5,946 SH
30 QUIDELORTHO CORP QDEL 219798105 $1.8M 0.64% 102,800 SH
31 CELSIUS HLDGS INC CELH 15118V207 $1.7M 0.62% 59,576 SH
32 VENTURE GLOBAL INC VG 92333F101 $1.4M 0.48% 122,022 SH
33 TRANSMEDICS GROUP INC TMDX 89377M109 $1.0M 0.36% 15,406 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $283.3M 33 0000919574-26-005460
2026-03-31 2026-05-14 $189.8M 34 0000919574-26-003095
2025-12-31 2026-02-17 $171.2M 23 0000919574-26-001169
2025-09-30 2025-11-14 $202.7M 28 0000919574-25-006888
Filer Information
Address
9 WEST 57TH STREET
27TH FLOOR
NEW YORK, NY 10019
Phone
(212) 256-8816
Filing Manager
BEACONLIGHT CAPITAL, LLC
New York, NY
Signatory
Ed Bosek
Managing Member