CSS LLC holds a diversified book of 739 stocks worth $1.8B as of Q1 2026 (disclosed May 15, 2026, a ~45-day 13F lag). This quarter they opened NextEra Energy Inc and trimmed Jazz Investments I Ltd. Their largest long position is Lumentum Holdings Inc at 12% of the equity book. They also disclosed $216.7M in put options (a bearish bet) and $73.2M in call options (bullish), shown separately below and excluded from the equity book.
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Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
28% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Lumentum Hldgs Inc NOTE 0.500% 6/1 | $216.5M | 40.46M | 12.0% | —Held | |
| 2 | Echostar Corp NOTE 3.875%11/3 | $146.6M | 40.93M | 8.2% | ▲+8.2% Added · +3.1M sh | |
| 3 | Jazz Investments I Ltd NOTE 2.000% 6/1 | $63.9M | 52.57M | 3.6% | ▼−19% Reduced · −12.5M sh | |
| 4 | Live Nation Entertainment In NOTE 3.125% 1/1 | $49.9M | 32.76M | 2.8% | —Held | |
| 5 | Transocean Inc DEB 4.625% 9/3 | $49.5M | 24.42M | 2.8% | ▼−11% Reduced · −2.9M sh | |
| 6 | Peabody Engr Corp NOTE 3.250% 3/0 | $37.8M | 20.66M | 2.1% | ▼−32% Reduced · −9.6M sh | |
| 7 | NextEra Energy Inc UNIT 02/15/2029 | $27.2M | 540.7K | 1.5% | ▲New New position | |
| 8 | Centerpoint Energy Inc NOTE 4.250% 8/1 | $24.9M | 21.00M | 1.4% | ▲New New position | |
| 9 | Alnylam Pharmaceuticals Inc NOTE 1.000% 9/1 | $23.9M | 18.56M | 1.3% | ▲New New position | |
| 10 | Invesco Exchange Traded FD T S&P500 EQL WGT | $19.9M | 103.5K | 1.1% | ▲+9.1% Added · +9K sh | |
| 11 | Vanguard Index FDS S&P 500 ETF SHS | $19.2M | 32.2K | 1.1% | ▲+1.8% Added · +560 sh | |
| 12 | Equinox Gold Corp NOTE 4.750%10/1 | $19.1M | 7.94M | 1.1% | ▼−58% Reduced · −11.0M sh | |
| 13 | Core Scientific Inc New *W EXP 01/23/202 | $18.2M | 2.08M | 1.0% | ▲+2.5% Added · +51K sh | |
| 14 | Albemarle Corp 7.25% DEP SHS A | $17.9M | 250.4K | 1.0% | ▲+402% Added · +201K sh | |
| 15 | Akamai Technologies Inc NOTE 1.125% 2/1 | $17.9M | 15.68M | 1.0% | ▲+1.1% Added · +173K sh | |
| 16 | Stride Inc NOTE 1.125% 9/0 | $17.8M | 10.30M | 1.0% | —Held | |
| 17 | Ishares Gold TR ISHARES NEW | $17.6M | 200.0K | 1.0% | ▲+1.4% Added · +3K sh | |
| 18 | Bridgebio Pharma Inc NOTE 1.750% 3/0 | $17.1M | 10.10M | 1.0% | ▲New New position | |
| 19 | Apollo Global Mgmt Inc SER A MAND CNV | $16.3M | 277.3K | 0.9% | ▲22× Added · +265K sh | |
| 20 | Snowflake Inc NOTE 10/0 | $15.9M | 13.00M | 0.9% | ▲New New position | |
| 21 | Cloudflare Inc NOTE 8/1 | $15.7M | 13.41M | 0.9% | ▲New New position | |
| 22 | Celcuity Inc NOTE 2.750% 8/0 | $15.4M | 6.31M | 0.9% | ▲+50% Added · +2.1M sh | |
| 23 | Kimco Realty Corp DP CV CL N 7.25% | $14.2M | 237.1K | 0.8% | ▲+18% Added · +37K sh | |
| 24 | Mara Holdings Inc NOTE 2.125% 9/0 | $14.0M | 16.50M | 0.8% | ▼−2.9% Reduced · −500K sh | |
| 25 | Wolfspeed Inc NOTE 2.500% 6/1 | $13.5M | 9.26M | 0.8% | ▲+36% Added · +2.4M sh | |
| 26 | Cheesecake Factory Inc NOTE 2.000% 3/1 | $13.4M | 13.19M | 0.7% | ▲New New position | |
| 27 | Bank America Corp 7.25%CNV PFD L | $12.3M | 10.3K | 0.7% | ▼−56% Reduced · −13K sh | |
| 28 | Penumbra Inc COM | $11.9M | 36.1K | 0.7% | ▲New New position | |
| 29 | Guardant Health Inc DEBT 1.250% 2/1 | $11.8M | 7.01M | 0.7% | ▼−36% Reduced · −4.0M sh | |
| 30 | El Paso Energy Cap TR I PFD CV TR SEC 28 | $11.6M | 226.7K | 0.6% | ▲10× Added · +204K sh | |
| 31 | Mara Holdings Inc NOTE 3/0 | $11.5M | 12.93M | 0.6% | ▲+12% Added · +1.4M sh | |
| 32 | Beyond Meat Inc DEBT 10/1 | $10.7M | 17.12M | 0.6% | —Held | |
| 33 | Vishay Intertechnology Inc NOTE 2.250% 9/1 | $9.7M | 10.08M | 0.5% | ▲+201% Added · +6.7M sh | |
| 34 | Brookdale SR Living Inc NOTE 2.000%10/1 | $9.5M | 5.63M | 0.5% | —Held | |
| 35 | CSG Sys Intl Inc NOTE 3.875% 9/1 | $9.1M | 7.50M | 0.5% | ▲+50% Added · +2.5M sh | |
| 36 | Hologic Inc COM | $8.9M | 118.0K | 0.5% | ▲+653% Added · +102K sh | |
| 37 | Special Opportunities FD Inc 2.75% CNV PFD C | $8.6M | 345.0K | 0.5% | ▲+6.7% Added · +22K sh | |
| 38 | SRH Total Return Fund Inc COM | $7.9M | 462.0K | 0.4% | —Held | |
| 39 | Southern Co NOTE 4.500% 6/1 | $7.9M | 7.10M | 0.4% | ▲55× Added · +7.0M sh | |
| 40 | Strategy Inc NOTE 2.250% 6/1 | $7.7M | 7.50M | 0.4% | ▼−4.9% Reduced · −385K sh | |
| 41 | Hewlett Packard Enterprise C 7.625 MAND CONV | $7.5M | 114.5K | 0.4% | ▲+603% Added · +98K sh | |
| 42 | Green Plains Inc NOTE 5.250%11/0 | $7.4M | 5.26M | 0.4% | —Held | |
| 43 | Lyft Inc NOTE 0.625% 3/0 | $7.3M | 7.24M | 0.4% | ▲+3.9% Added · +269K sh | |
| 44 | Titan Acquisition Corp CL A | $7.3M | 708.3K | 0.4% | —Held | |
| 45 | Iron Horse Acquisit II Corp COM | $7.3M | 737.6K | 0.4% | ▲New New position | |
| 46 | Alphatec Hldgs Inc NOTE 0.750% 8/0 | $7.2M | 7.20M | 0.4% | ▲+38% Added · +2.0M sh | |
| 47 | NextEra Energy Cap Hldgs Inc NOTE 3.000% 3/0 | $6.9M | 5.00M | 0.4% | ▲New New position | |
| 48 | Western Digital Corp COM | $6.9M | 25.4K | 0.4% | ▼−36% Reduced · −14K sh | |
| 49 | Wen Acquisition Corp COM CL A | $6.6M | 647.6K | 0.4% | —Held | |
| 50 | Fluence Energy Inc NOTE 2.250% 6/1 | $6.2M | 6.14M | 0.3% | ▼−39% Reduced · −4.0M sh |
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | GAMESTOP CORP-CLASS AGME | $28.0M | 1.2M |
| PUT · bearish | SPDR GOLD SHARESGLD | $16.4M | 38K |
| CALL · bullish | SS SPDR S&P 500 ETF TRUST-USSPY | $14.6M | 23K |
| PUT · bearish | STRATEGY INCMSTR | $14.2M | 114K |
| PUT · bearish | HOLOGIC INCHO1 | $12.8M | 169K |
| PUT · bearish | PENUMBRA INCPEN | $12.2M | 37K |
| PUT · bearish | ISHARES 20+ YEAR TREASURY BDTLT | $11.3M | 130K |
| CALL · bullish | MASIMO CORPMASI | $9.6M | 54K |
| PUT · bearish | XEROX HOLDINGS CORP | $9.2M | 7.2M |
| PUT · bearish | AMERICAN AIRLINES GROUP INCAAL | $6.3M | 582K |
| PUT · bearish | ECHOSTAR CORP-ASATS | $5.3M | 45K |
| PUT · bearish | DIGITALBRIDGE GROUP INCDBRG | $4.7M | 307K |
| PUT · bearish | SHIFT4 PAYMENTS INC-CLASS AFOUR | $4.7M | 108K |
| PUT · bearish | NIO INC - ADRNIO | $4.6M | 760K |
| CALL · bullish | ISHARES 20+ YEAR TREASURY BDTLT | $4.3M | 50K |
| CALL · bullish | NVIDIA CORPNVDA | $3.5M | 20K |
| PUT · bearish | SUPER MICRO COMPUTER INCSMCI | $3.3M | 146K |
| CALL · bullish | MICROSOFT CORPMSFT | $3.3M | 9K |
| PUT · bearish | RIVIAN AUTOMOTIVE INC-ARIVN | $3.1M | 203K |
| PUT · bearish | ISHARES RUSSELL 2000 ETFIWM | $3.0M | 12K |
| PUT · bearish | MARA HOLDINGS INCMARA | $2.9M | 356K |
| PUT · bearish | ISHR IBX USD INVGD CB ETF-UILQD | $2.7M | 25K |
| PUT · bearish | SS SPDR S&P 500 ETF TRUST-USSPY | $2.6M | 4K |
| CALL · bullish | SS FINANCIAL SELECT SECTORXLF | $2.5M | 50K |
| CALL · bullish | ELECTRONIC ARTS INCEA | $2.3M | 11K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above. Showing the largest 25 of 222 option legs.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 961 | $2.1B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 17, 2026 | 999 | $2.2B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 13, 2025 | 985 | $2.2B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 14, 2025 | 953 | $2.1B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 15, 2025 | 909 | $1.8B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 18, 2025 | 955 | $2.3B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 14, 2024 | 820 | $2.2B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 14, 2024 | 875 | $2.0B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 15, 2024 | 806 | $1.7B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 14, 2024 | 792 | $1.7B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 14, 2023 | 808 | $1.5B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 14, 2023 | 891 | $1.6B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 15, 2023 | 724 | $1.5B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 14, 2023 | 925 | $1.8B | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 14, 2022 | 1,046 | $2.1B | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 15, 2022 | 1,092 | $2.5B | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 16, 2022 | 1,146 | $2.8B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 14, 2022 | 1,225 | $2.8B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 15, 2021 | 1,166 | $2.4B | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 16, 2021 | 1,057 | $2.4B | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 17, 2021 | 907 | $2.4B | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 16, 2021 | 804 | $2.6B | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 16, 2020 | 791 | $2.1B | 13F-HR |
| Q2 2020 | Jun 30, 2020 | Aug 14, 2020 | 646 | $1.8B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.