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CSS LLC/IL

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$2.57B
Positions
1001
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (51 quarters reported)

$2.81B $1.27B
Q4 13 Q3 16 Q2 19 Q1 22 Q4 24 Q2 26

$2.08B in Q4 2013 → $2.57B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
LH Lumentum Hldgs Inc 9.6% Trimmed 7.2% 37,554,000 $246M
HP Hewlett Packard Enterprise C 5.8% Added 1015% 1,276,322 $149M
Echostar Corp 5.4% Added 7.3% 43,925,753 $137M
AG Apollo Global Mgmt Inc 3.2% Added 391% 1,361,499 $82.8M
BO Bank Of Amer Corp 2.5% Added 388% 50,372 $63.3M
Wolfspeed Inc 2.1% Added 49% 13,773,940 $54.2M
Super Micro Computer Inc 1.8% New 878,227 $45.3M
CS Core Scientific Inc New 1.7% Added 13% 2,351,492 $44.2M
Microchip Technology Inc. 1.7% New 558,552 $43M
Cloudflare Inc 1.3% Added 95% 26,112,000 $33.5M
Akamai Technologies Inc 1.2% Added 58% 24,797,000 $29.6M
Gamestop Corp Put 1.1% Added 1.3% 1,230,200 $27.2M
Albemarle Corp 1.0% Added 88% 470,583 $26.1M
Centerpoint Energy Inc 1.0% Unchanged 21,000,000 $25.3M
Equinox Gold Corp 1.0% Added 88% 14,895,000 $25.1M
Boeing Co 0.9% New 349,354 $23.6M
Transocean Inc 0.9% Trimmed 38% 15,168,000 $23.5M
EP El Paso Energy Cap Tr I 0.9% Added 97% 446,461 $22.6M
IE Invesco Exchange Traded Fd T 0.9% Added 0.6% 104,072 $22.1M
VI Vanguard Index Fds 0.9% Unchanged 32,210 $22.1M
KM Kinder Morgan Inc Del Put 0.8% New 678,900 $21.7M
Iren Limited 0.8% New 6,000,000 $21.2M
DH Digitalocean Hldgs Inc 0.8% New 17,243,000 $19.5M
Ptc Therapeutics Inc 0.7% Added 316% 12,002,000 $18.6M
Snowflake Inc 0.6% Trimmed 28% 9,300,000 $16.5M
Xerox Holdings Corp Put 0.6% Trimmed 29% 5,100,000 $16M
Western Digital Corp 0.6% Trimmed 2.0% 24,933 $15.9M
Gamestop Corp 0.6% New 14,944,000 $15.2M
IG Ishares Gold Tr 0.6% Unchanged 200,040 $15.1M
Kimco Realty Corp 0.6% Added 0.0% 237,147 $15M
SS State Str SPDR S&P 500 ETF T Call 0.6% Trimmed 16% 19,000 $14.2M
Alphabet Inc 0.5% New 266,589 $13.4M
SS State Str SPDR S&P 500 ETF T 0.5% New 17,269 $12.9M
Penumbra Inc 0.5% Added 7.2% 38,740 $12.2M
Ionis Pharmaceuticals Inc 0.5% Added 93% 152,289 $12.1M
Bridgebio Pharma Inc 0.5% Trimmed 29% 7,175,000 $12.1M
Celcuity Inc 0.5% Trimmed 16% 5,310,000 $11.9M
HM Haemonetics Corp Mass 0.5% Added 9326% 11,500,000 $11.6M
Penumbra Inc Put 0.4% Trimmed 3.0% 36,100 $11.4M
Guardant Health Inc 0.4% Trimmed 36% 4,514,000 $11.3M
Mara Holdings Inc 0.4% Trimmed 39% 10,000,000 $11.1M
BS Brookdale Sr Living Inc 0.4% Unchanged 5,632,000 $11M
Alnylam Pharmaceuticals Inc 0.4% Trimmed 51% 9,063,000 $10.9M
Transmedics Group Inc 0.4% New 10,000,000 $10.9M
On Semiconductor Corp 0.4% Added 19489% 8,619,000 $10.4M
OA Oceanhawk Acquisition Corp 0.4% New 1,038,610 $10.3M
PC Ppl Cap FDG Inc 0.4% Added 201% 8,988,000 $10.2M
FS Futurecorp Space Acquisition 0.4% New 1,000,000 $10.1M
Electronic Arts Inc Put 0.4% Added 1095% 47,800 $9.8M
Mara Holdings Inc 0.4% Trimmed 27% 9,467,000 $9.53M
Guardant Health Inc 0.4% New 7,577,000 $9.4M
CI Chart Inds Inc 0.4% Added 328% 44,924 $9.39M
Beyond Meat Inc 0.4% Trimmed 18% 14,003,381 $9.33M
Janus Henderson Group PLC 0.4% Added 1012% 176,575 $9.18M
SO Special Opportunities Fd Inc 0.3% Added 5.0% 362,349 $8.99M
Lyft Inc 0.3% Added 18% 8,520,000 $8.93M
Srh Total Return Fund Inc 0.3% Unchanged 461,965 $8.27M
Nextera Energy Inc 0.3% Trimmed 68% 172,063 $8.24M
IT Ishares Tr Call 0.3% Added 80% 90,000 $7.78M
IH Integer Hldgs Corp 0.3% Added 104% 8,034,000 $7.76M

Showing top 60 of 1001 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
HP Hewlett Packard Enterprise C Added +1,161,821 +$136M 5.8%
AG Apollo Global Mgmt Inc Added +1,084,181 +$65.9M 3.2%
JI Jazz Investments I Ltd Exited −52,574,000 −$63.9M
BO Bank Of Amer Corp Added +40,058 +$50.3M 2.5%
LN Live Nation Entertainment In Exited −32,756,000 −$49.9M
Super Micro Computer Inc New +878,227 +$45.3M 1.8%
Microchip Technology Inc. New +558,552 +$43M 1.7%
Boeing Co New +349,354 +$23.6M 0.9%
KM Kinder Morgan Inc Del New +678,900 +$21.7M 0.8%
Iren Limited New +6,000,000 +$21.2M 0.8%

Showing the 10 largest of 1072 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Ionis Pharmaceuticals Inc Exited −44,792,000 −$61.5M
Western Digital Corp Exited −330,000 −$56.8M
LH Lumentum Hldgs Inc Exited −7,500,000 −$39.9M
SS State Str SPDR S&P 500 ETF T Trimmed −50,200 −$32.6M 0.7%
Bridgebio Pharma Inc Exited −26,500,000 −$29.8M
Nextera Energy Inc New +540,739 +$27.2M 1.3%
Equinox Gold Corp Trimmed −11,000,000 −$26.5M 0.9%
Centerpoint Energy Inc New +21,000,000 +$24.9M 1.2%
Alnylam Pharmaceuticals Inc New +18,563,000 +$23.9M 1.1%
Strategy Inc Trimmed −167,800 −$20.9M 0.7%

Showing the 10 largest of 1131 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
Echostar Corp Added +23,417,044 +$78.3M 5.6%
Western Digital Corp New +330,000 +$56.8M 2.5%
Sandisk Corp Exited −330,000 −$37M
Ionis Pharmaceuticals Inc Trimmed −21,071,000 −$33.5M 0.2%
LH Lumentum Hldgs Inc Trimmed −6,000,000 −$31.9M 1.8%
Bridgebio Pharma Inc Added +25,000,000 +$28.1M 1.3%
Wayfair Inc Trimmed −12,067,000 −$27.7M 0.5%
BA Bank America Corp Added +20,048 +$25M 1.3%
Ionis Pharmaceuticals Inc Trimmed −17,590,000 −$24.2M 2.7%
Stride Inc Trimmed −16,974,000 −$23.2M 0.6%

Showing the 10 largest of 1122 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 13, 2025

Company Action Shares changed Value of change % of portfolio
LN Live Nation Entertainment In Added +33,672,000 +$54.6M 3.3%
BH Brightspring Health Svcs Inc Trimmed −396,299 −$40.2M
Echostar Corp New +14,408,709 +$35.4M 1.6%
SH Seagate Hdd Cayman Exited −19,458,000 −$35M
Ionis Pharmaceuticals Inc New +24,500,000 +$33.9M 1.5%
LH Lumentum Hldgs Inc New +13,500,000 +$32.6M 1.5%
LH Lumentum Hldgs Inc Added +21,864,000 +$30.5M 2.2%
Nextera Energy Inc Exited −761,694 −$30.3M
Equinox Gold Corp Added +14,476,000 +$27.8M 1.6%
Strategy Inc New +14,500,000 +$27.5M 1.2%

Showing the 10 largest of 1124 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
American Airlines Group Inc Trimmed −64,683,000 −$64.7M 0.1%
Insmed Inc Exited −22,586,000 −$53.4M
Axon Enterprise Inc Trimmed −42,470 −$35.2M 0.2%
Penn Entertainment Inc Exited −33,700,000 −$34.6M
BH Brightspring Health Svcs Inc New +400,466 +$33M 1.5%
M Microstrategy Inc New +14,897,000 +$32M 1.5%
Nextera Energy Inc Added +756,498 +$30.1M 1.4%
SH Seagate Hdd Cayman Added +14,631,000 +$26.3M 1.6%
GN Gamestop Corp New Added +1,022,300 +$24.9M 1.6%
SA Southwest Airls Co Exited −24,500,000 −$24.4M

Showing the 10 largest of 1120 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
Axon Enterprise Inc Exited −30,750,000 −$80.3M
M Microstrategy Inc Trimmed −138,800 −$40M 4.0%
SS SPDR S&P 500 ETF Tr Trimmed −71,100 −$39.8M 1.1%
CI Chart Inds Inc Trimmed −596,989 −$33.1M 0.4%
MT Macom Tech Solutions Hldgs I Exited −226,997 −$29.5M
Centerpoint Energy Inc Exited −25,000,000 −$25.6M
Axon Enterprise Inc New +47,404 +$24.9M 1.4%
SA Southwest Airls Co New +24,500,000 +$24.4M 1.3%
VR Ventas Rlty Ltd Partnership New +17,000,000 +$21.8M 1.2%
M Microstrategy Inc New +15,400,000 +$21.8M 1.2%

Showing the 10 largest of 1114 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 18, 2025

Company Action Shares changed Value of change % of portfolio
Carnival Corp Trimmed −3,210,258 −$80M 0.1%
SS SPDR S&P 500 ETF Tr Trimmed −123,000 −$72.1M 1.1%
SS SPDR S&P 500 ETF Tr New +107,100 +$62.8M 2.8%
MT Macom Tech Solutions Hldgs I Exited −40,977,000 −$57.9M
CI Chart Inds Inc New +733,800 +$52M 2.3%
Rbc Bearings Inc Exited −294,827 −$39.3M
AG Apollo Global Mgmt Inc Added +388,795 +$33.9M 1.9%
SS SPDR S&P 500 ETF Tr Trimmed −55,474 −$32.5M
MT Macom Tech Solutions Hldgs I New +226,997 +$29.5M 1.3%
Datadog Inc Exited −21,487,000 −$27.9M

Showing the 10 largest of 1044 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

Company Action Shares changed Value of change % of portfolio
RC Royal Caribbean Group Exited −50,150,000 −$162M
Carnival Corp New +3,269,100 +$60.4M 2.8%
SS SPDR S&P 500 ETF Tr Trimmed −96,500 −$55.4M 4.3%
M Microstrategy Inc Added +320,500 +$54M 2.7%
Burlington Stores Inc New +17,750,000 +$25.1M 1.1%
GA Ge Aerospace Exited −150,000 −$23.8M
Transocean Inc Added +15,661,000 +$23.2M 1.1%
Penn Entertainment Inc New +20,300,000 +$22M 1.0%
JI Jazz Investments I Ltd Added +21,500,000 +$21.4M 1.3%
Stride Inc Added +11,439,000 +$19.3M 2.3%

Showing the 10 largest of 971 changes.

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