CSS LLC/IL — 13F Holdings & Portfolio
CIK 1103646 · latest 13F-HR filed 2026-05-15
CSS LLC/IL manages $2.09B in 13F-reported U.S. long-equity assets across 961 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are LITE (10.37%), ECHOSTAR CORP (7.02%), JAZZ (3.06%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 188 new positions, exited 200, added to 193, and trimmed 254.
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.
$2.09B
Long-equity book
961
Distinct positions
2026-03-31
Filed 2026-05-15
+188 / −200 / ↑193 / ↓254
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- LUMENTUM HLDGS INC$101.5M +88.3%
- ECHOSTAR CORP$20.0M +15.8%
- APOLLO GLOBAL MGMT INC$15.3M +1604.9%
- ALBEMARLE CORP$15.0M +510.4%
- TRANSOCEAN INC$11.9M +31.6%
Top Trims
- EQUINOX GOLD CORP-$25.3M -56.9%
- BANK AMERICA CORP-$17.2M -58.3%
- SNOWFLAKE INC-$13.7M -88.5%
- PEABODY ENGR CORP-$13.0M -25.6%
- HAEMONETICS CORP MASS-$12.9M -99.1%
New Positions
- NEXTERA ENERGY INC$27.2M
- CENTERPOINT ENERGY INC$24.9M
- ALNYLAM PHARMACEUTICALS INC$23.9M
- BRIDGEBIO PHARMA INC$17.1M
- SNOWFLAKE INC$15.9M
Exited Positions
- IONIS PHARMACEUTICALS INC$61.5M
- LUMENTUM HLDGS INC$39.9M
- BRIDGEBIO PHARMA INC$29.8M
- MANNKIND CORP$15.9M
- COLLEGIUM PHARMACEUTICAL INC$14.8M
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 | LUMENTUM HLDGS INC | LITE | 55024UAF6 | $216.5M | 10.37% | 40,464,000 | PRN |
| 2 | ECHOSTAR CORP | — | 278768AB2 | $146.6M | 7.02% | 40,925,753 | PRN |
| 3 | JAZZ INVESTMENTS I LTD | JAZZ | 472145AF8 | $63.9M | 3.06% | 52,574,000 | PRN |
| 4 | LIVE NATION ENTERTAINMENT IN | LYV | 538034BA6 | $49.9M | 2.39% | 32,756,000 | PRN |
| 5 | TRANSOCEAN INC | — | 893830BW8 | $49.5M | 2.37% | 24,418,000 | PRN |
| 6 | PEABODY ENGR CORP | — | 704551AD2 | $37.8M | 1.81% | 20,662,000 | PRN |
| 7 | GAMESTOP CORP Put | GME | 36467W109 | $28.0M | 1.34% | 1,214,000 | SH |
| 8 | NEXTERA ENERGY INC | NEEPV | 65339F655 | $27.2M | 1.30% | 540,739 | SH |
| 9 | CENTERPOINT ENERGY INC | CNP | 15189TBD8 | $24.9M | 1.19% | 21,000,000 | PRN |
| 10 | ALNYLAM PHARMACEUTICALS INC | ALNY | 02043QAB3 | $23.9M | 1.14% | 18,563,000 | PRN |
| 11 | INVESCO EXCHANGE TRADED FD T | RSP | 46137V357 | $19.9M | 0.95% | 103,482 | SH |
| 12 | VANGUARD INDEX FDS | VOO | 922908363 | $19.2M | 0.92% | 32,210 | SH |
| 13 | EQUINOX GOLD CORP | EQX | 29446YAC0 | $19.1M | 0.92% | 7,936,000 | PRN |
| 14 | CORE SCIENTIFIC INC NEW | CORZW | 21874A114 | $18.2M | 0.87% | 2,083,119 | SH |
| 15 | ALBEMARLE CORP | ALBPA | 012653200 | $17.9M | 0.86% | 250,421 | SH |
| 16 | AKAMAI TECHNOLOGIES INC | AKAM | 00971TAN1 | $17.9M | 0.86% | 15,678,000 | PRN |
| 17 | STRIDE INC | LRN | 86333MAA6 | $17.8M | 0.85% | 10,300,000 | PRN |
| 18 | ISHARES GOLD TR | IAU | 464285204 | $17.6M | 0.84% | 200,040 | SH |
| 19 | BRIDGEBIO PHARMA INC | BBIO | 10806XAJ1 | $17.1M | 0.82% | 10,100,000 | PRN |
| 20 | SPDR GOLD TR Put | GLD | 78463V107 | $16.4M | 0.78% | 38,000 | SH |
| 21 | APOLLO GLOBAL MGMT INC | APOPA | 03769M304 | $16.3M | 0.78% | 277,318 | SH |
| 22 | SNOWFLAKE INC | SNOW | 833445AD1 | $15.9M | 0.76% | 13,000,000 | PRN |
| 23 | CLOUDFLARE INC | NET | 18915MAC1 | $15.7M | 0.75% | 13,412,000 | PRN |
| 24 | CELCUITY INC | CELC | 15102KAA8 | $15.4M | 0.74% | 6,310,000 | PRN |
| 25 | STATE STR SPDR S&P 500 ETF T Call | SPY | 78462F103 | $14.6M | 0.70% | 22,500 | SH |
| 26 | KIMCO REALTY CORP | KIMPN | 49446R687 | $14.2M | 0.68% | 237,114 | SH |
| 27 | STRATEGY INC Put | MSTR | 594972408 | $14.2M | 0.68% | 113,600 | SH |
| 28 | MARA HOLDINGS INC | MARA | 565788AD8 | $14.0M | 0.67% | 16,500,000 | PRN |
| 29 | WOLFSPEED INC | WOLF | 977852AP7 | $13.5M | 0.65% | 9,256,940 | PRN |
| 30 | CHEESECAKE FACTORY INC | CAKE | 163072AC5 | $13.4M | 0.64% | 13,194,000 | PRN |
| 31 | HOLOGIC INC Put | HOLX | 436440101 | $12.8M | 0.61% | 169,300 | SH |
| 32 | BANK AMERICA CORP | BACPL | 060505682 | $12.3M | 0.59% | 10,314 | SH |
| 33 | PENUMBRA INC Put | PEN | 70975L107 | $12.2M | 0.59% | 37,200 | SH |
| 34 | PENUMBRA INC | PEN | 70975L107 | $11.9M | 0.57% | 36,140 | SH |
| 35 | GUARDANT HEALTH INC | GH | 40131MAD1 | $11.8M | 0.57% | 7,014,000 | PRN |
| 36 | EL PASO ENERGY CAP TR I | EPPC | 283678209 | $11.6M | 0.55% | 226,704 | SH |
| 37 | MARA HOLDINGS INC | MARA | 565788AF3 | $11.5M | 0.55% | 12,933,000 | PRN |
| 38 | ISHARES TR Put | TLT | 464287432 | $11.3M | 0.54% | 130,000 | SH |
| 39 | BEYOND MEAT INC | BYND | 08862EAD1 | $10.7M | 0.51% | 17,118,000 | PRN |
| 40 | VISHAY INTERTECHNOLOGY INC | VSH | 928298AR9 | $9.7M | 0.47% | 10,078,000 | PRN |
| 41 | MASIMO CORP Call | MASI | 574795100 | $9.6M | 0.46% | 53,900 | SH |
| 42 | BROOKDALE SR LIVING INC | — | 112463AC8 | $9.5M | 0.46% | 5,632,000 | PRN |
| 43 | XEROX HOLDINGS CORP Put | — | 98421M956 | $9.2M | 0.44% | 7,160,000 | SH |
| 44 | CSG SYS INTL INC | INTWF | 126349AH2 | $9.1M | 0.44% | 7,500,000 | PRN |
| 45 | HOLOGIC INC | HOLX | 436440101 | $8.9M | 0.43% | 117,968 | SH |
| 46 | SPECIAL OPPORTUNITIES FD INC | SPEPC | 84741T401 | $8.6M | 0.41% | 344,986 | SH |
| 47 | SRH TOTAL RETURN FUND INC | STEW | 101507101 | $7.9M | 0.38% | 461,965 | SH |
| 48 | SOUTHERN CO | SO | 842587DZ7 | $7.9M | 0.38% | 7,102,000 | PRN |
| 49 | STRATEGY INC | MHIFF | 594972AN1 | $7.7M | 0.37% | 7,500,000 | PRN |
| 50 | HEWLETT PACKARD ENTERPRISE C | HPEPC | 42824C208 | $7.5M | 0.36% | 114,501 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-15 | $2.09B | 961 | 0001103646-26-000009 |
| 2025-12-31 | 2026-02-17 | $2.25B | 999 | 0001103646-26-000003 |
| 2025-09-30 | 2025-11-13 | $2.23B | 985 | 0001103646-25-000009 |