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LONESTAR CAPITAL MANAGEMENT LLC — 13F Holdings & Portfolio

CIK 1317410 · latest 13F-HR filed 2026-08-14

Backtest portfolio

LONESTAR CAPITAL MANAGEMENT LLC manages $345.4M in 13F-reported U.S. long-equity assets across 29 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SPY (32.43%), QQQ (21.32%), GTX (5.77%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 5 new positions and exited 5; 5 existing positions rose in reported value and 14 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.

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AUM
$345.4M

Long-equity book

Holdings
29

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+5 / −5 / ↑5 / ↓14

vs 2026-03-31

Portfolio charts

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

Portfolio map

Q2 26
GTX12.8% · -31%ET11.1% · 0%GSL7.0% · +81%DHC6.3% · -34%TH5.7% · +16%BKD5.6% · -18%CVSA4.4% · newVST4.1% · -20%TLN4.0% · -47%GDX3.9% · 0%DCH3.3% · -37%CE3.3% · -45%EXE3.2% · -35%LINC2.7% · -44%DOW2.6% · -17%NRG2.5% · -55%KYIV2.5% · newLUMN2.5% · +18%UTI2.3% · 0%EQT2.1% · -33%LYB2.0% · 0%RIG1.5% · -47%SDRL1.3% · -45%GLXY1.2% · newADT1.0% · newSVC1.0% · new

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 = 64.8%

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

Firm Profile & Key People

As of the firm’s regulatory filing dated Jun 4, 2015.

Assets Under Management
$245.0M
Discretionary
$245.0M
Employees
7
Accounts
1
Address
2420 SAND HILL ROAD, SUITE 202
MENLO PARK, CA 94025
Phone
(650) 854-7500
Name Title / Status Ownership Type
SIMON, JEROME, L ControlMANAGER; MANAGING MEMBER
since Jun 2003
75% or moreIndividual
WONG, YEDI ControlCHIEF FINANCIAL OFFICER; CHIEF COMPLIANCE OFFICER; MEMBER
since Oct 2003
Less than 5%Individual
Ownership & leadership changes · 1 filing 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 26, 2014 filing
  • No longer listedLEVINSON, PETER · MANAGING DIRECTOR; HEAD TRADER; MEMBER · Less than 5% · control person · listed since Apr 2009
Feb 14, 2012 filing (earliest on record)
  • ListedLEVINSON, PETER · MANAGING DIRECTOR; HEAD TRADER; MEMBER · Less than 5% · control person
  • ListedSIMON, JEROME, L · MANAGER; MANAGING MEMBER · 75% or more · control person
  • ListedWONG, YEDI · CHIEF FINANCIAL OFFICER; CHIEF COMPLIANCE OFFICER; MEMBER · Less than 5% · 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.

LONESTAR CAPITAL MANAGEMENT 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 $112.0M 32.43% 1,500 SH
2 INVESCO QQQ TR Put QQQ 46090E103 $73.6M 21.32% 1,000 SH
3 GARRETT MOTION INC GTX 366505105 $19.9M 5.77% 550,000 SH
4 ENERGY TRANSFER L P ET 29273V100 $17.2M 4.98% 900,000 SH
5 GLOBAL SHIP LEASE INC GSL Y27183600 $10.9M 3.16% 290,000 SH
6 DIVERSIFIED HEALTHCARE TR DHC 25525P107 $9.8M 2.83% 1,050,000 SH
7 TARGET HOSPITALITY CORP TH 87615L107 $8.8M 2.55% 433,100 SH
8 BROOKDALE SR LIVING INC BKD 112463104 $8.7M 2.52% 540,000 SH
9 COVISTA INC CVSA 00737L103 $6.9M 1.99% 55,000 SH
10 VISTRA CORP VST 92840M102 $6.3M 1.84% 40,000 SH
11 TALEN ENERGY CORP TLN 87422Q109 $6.1M 1.78% 16,000 SH
12 VANECK ETF TRUST GDX 92189F106 $6.0M 1.75% 80,000 SH
13 DAUCH CORP DCH 024061103 $5.1M 1.49% 950,000 SH
14 CELANESE CORP DEL CE 150870103 $5.1M 1.47% 110,000 SH
15 EXPAND ENERGY CORPORATION EXE 165167735 $5.0M 1.45% 55,000 SH
16 TRANSOCEAN LTD Call RIG H8817H100 $4.4M 1.27% 9,000 SH
17 LINCOLN EDL SVCS CORP LINC 533535100 $4.2M 1.21% 83,911 SH
18 DOW HLDGS INC DOW 260557103 $4.1M 1.19% 150,000 SH
19 NRG ENERGY INC NRG 629377508 $3.9M 1.14% 27,000 SH
20 KYIVSTAR GROUP LTD KYIV G5331N101 $3.9M 1.12% 240,000 SH
21 LUMEN TECHNOLOGIES INC LUMN 550241103 $3.8M 1.11% 500,000 SH
22 UNIVERSAL TECHNICAL INST INC UTI 913915104 $3.6M 1.05% 85,000 SH
23 EQT CORP EQT 26884L109 $3.2M 0.92% 60,000 SH
24 LYONDELLBASELL INDUSTRIES NV LYB N53745100 $3.2M 0.91% 60,000 SH
25 TRANSOCEAN LTD RIG H8817H100 $2.3M 0.67% 475,000 SH
26 SEADRILL LTD SDRL G7997W102 $2.1M 0.60% 55,000 SH
27 GALAXY DIGITAL INC. GLXY 36317J209 $1.9M 0.55% 70,000 SH
28 ADT INC DEL ADT 00090Q103 $1.6M 0.47% 250,000 SH
29 SERVICE PPTYS TR SVC 81761L102 $1.5M 0.44% 900,000 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $345.4M 29 0000935836-26-000402
2026-03-31 2026-05-15 $670.8M 32 0000935836-26-000253
2025-12-31 2026-02-17 $624.2M 31 0000935836-26-000100
2025-09-30 2025-11-14 $684.9M 27 0000935836-25-000675
Filer Information
Address
601 CALIFORNIA STREET, 5TH FLOOR
SAN FRANCISCO, CA 94108
Phone
(415) 433-2010
Filing Manager
LONESTAR CAPITAL MANAGEMENT LLC
San Francisco, CA
Signatory
Yedi Wong
Chief Financial Officer