CSS LLC reported 470 positions worth $506.50M for the quarter ended Jun 30, 2026, up 19.6% on the prior quarter. It opened 125 new positions, added to 128, trimmed 137 and exited 92. Its largest holding is Western Digital Corp at 3.1% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| JAZZ Jazz Pharmaceuticals plc | +29.0K | – | $7.00M | 1.38% |
| IONS Ionis Pharmaceuticals Inc | +73.2K | +92.5% | $5.80M | 2.38% |
| EVAC EQV Ventures Acquisition Corp. II | +554.7K | +466.4% | $5.65M | 1.35% |
| CUB Lionheart Holdings | +507.6K | – | $5.47M | 1.08% |
| AZUL Azul Sa | +597.8K | – | $5.37M | 1.06% |
| RVMDW Revolution Medicines, Inc. | +60.9K | +347.7% | $5.13M | 1.31% |
| KEYY Keystone Acquisition Corp. | +451.5K | – | $4.45M | 0.879% |
| ARTC Art Technology Acquisition Corp. | +396.3K | +433.1% | $3.93M | 0.956% |
| CAES Cantor Equity Partners VII, Inc. | +375.0K | – | $3.78M | 0.747% |
| IPFX Inflection Point Acquisition Corp. VI | +355.6K | – | $3.68M | 0.726% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| IRHO Iron Horse Acquisition II Corp. | -737.6K | -100.0% | $7.27M | Exited |
| GLD Spdr Gold Trust | -12.6K | -100.0% | $5.43M | Exited |
| IPFXU Inflection Point Acquisition Corp. VI | -405.7K | -100.0% | $4.11M | Exited |
| BCSS Bain Capital GSS Investment Corp. | -387.4K | -100.0% | $3.92M | Exited |
| MZYX/U MOZAYYX ACQUISITION CORP UNITS CONSISTING ONE CL A ORD SH & ONE-QTR ONE RED WT | -308.4K | -100.0% | $3.07M | Exited |
| DELL Dell Technologies Inc. | -5,790 | -54.4% | $2.50M | 0.413% |
| IBIT iShares Bitcoin Trust ETF | -59.9K | -95.3% | $1.99M | 0.019% |
| IACOU Idea Acquisition Corp. | -184.0K | -92.0% | $1.84M | 0.032% |
| ALF Centurion Acquisition Corp. | -150.7K | -100.0% | $1.62M | Exited |
| SLV iShares Silver Trust | -23.5K | -100.0% | $1.60M | Exited |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| JAZZ Jazz Pharmaceuticals plc | +29.0K | $7.00M | 1.38% |
| CUB Lionheart Holdings | +507.6K | $5.47M | 1.08% |
| AZUL Azul Sa | +597.8K | $5.37M | 1.06% |
| KEYY Keystone Acquisition Corp. | +451.5K | $4.45M | 0.879% |
| CAES Cantor Equity Partners VII, Inc. | +375.0K | $3.78M | 0.747% |
| IPFX Inflection Point Acquisition Corp. VI | +355.6K | $3.68M | 0.726% |
| CAII Collective Acquisition Corp. II | +350.2K | $3.47M | 0.684% |
| BIDWU Tribeca Strategic Acquisition Corp. | +250.0K | $2.49M | 0.491% |
| DRDB Roman DBDR Acquisition Corp. II | +229.9K | $2.42M | 0.478% |
| MSTR Strategy Inc | +31.2K | $2.21M | 0.436% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| IRHO Iron Horse Acquisition II Corp. | -737.6K | $7.27M | 1.72% |
| GLD Spdr Gold Trust | -12.6K | $5.43M | 1.28% |
| IPFXU Inflection Point Acquisition Corp. VI | -405.7K | $4.11M | 0.97% |
| BCSS Bain Capital GSS Investment Corp. | -387.4K | $3.92M | 0.925% |
| MZYX/U MOZAYYX ACQUISITION CORP UNITS CONSISTING ONE CL A ORD SH & ONE-QTR ONE RED WT | -308.4K | $3.07M | 0.725% |
| ALF Centurion Acquisition Corp. | -150.7K | $1.62M | 0.383% |
| SLV iShares Silver Trust | -23.5K | $1.60M | 0.379% |
| PSA Public Storage | -5,100 | $1.38M | 0.326% |
| OSIS Osi Systems Inc | -4,500 | $1.19M | 0.282% |
| PG PROCTER & GAMBLE Co | -8,070 | $1.17M | 0.275% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | WDC Western Digital Corp | Technology | 24.9K | $15.93M | 3.14% | -500 | -2.0% | Reduced | 0.01% |
| 2 | IAU Ishares Gold Trust | Others | 200.0K | $15.11M | 2.98% | 0 | 0.0% | Unchanged | 0.03% |
| 3 | 49446R68 Kimco Realty Corp. | Others | 237.1K | $14.98M | 2.96% | +33 | +0.0% | Added | 0% |
| 4 | PEN Penumbra Inc | Healthcare | 38.7K | $12.23M | 2.42% | +2,600 | +7.2% | Added | 0.1% |
| 5 | IONS Ionis Pharmaceuticals Inc | Healthcare | 152.3K | $12.07M | 2.38% | +73.2K | +92.5% | Added | 0.09% |
| 6 | TACH Titan Acquisition Corp. | Financial Services | 708.3K | $7.37M | 1.46% | 0 | 0.0% | Unchanged | 2.05% |
| 7 | JAZZ Jazz Pharmaceuticals plc | Healthcare | 29.0K | $7.00M | 1.38% | +29.0K | – | New | 0.04% |
| 8 | EVAC EQV Ventures Acquisition Corp. II | Financial Services | 673.7K | $6.86M | 1.35% | +554.7K | +466.4% | Added | 1.43% |
| 9 | WENN WEN Acquisition Corp | Financial Services | 647.6K | $6.66M | 1.32% | 0 | 0.0% | Unchanged | 1.73% |
| 10 | RVMDW Revolution Medicines, Inc. | Healthcare | 78.4K | $6.61M | 1.31% | +60.9K | +347.7% | Added | 0.04% |
| 11 | CUB Lionheart Holdings | Financial Services | 507.6K | $5.47M | 1.08% | +507.6K | – | New | 2.17% |
| 12 | AZUL Azul Sa | Industrials | 597.8K | $5.37M | 1.06% | +597.8K | – | New | 0.03% |
| 13 | BE Bloom Energy Corp | Industrials | 17.2K | $5.21M | 1.03% | +100 | +0.6% | Added | 0.01% |
| 14 | AACIU Armada Acquisition Corp. III | Financial Services | 500.0K | $5.04M | 0.995% | -41 | 0.0% | Reduced | 0% |
| 15 | MTSI MACOM Technology Solutions Holdings, Inc. | Technology | 13.1K | $5.00M | 0.987% | +1,900 | +16.9% | Added | 0.02% |
Tip. Select a row to see that position’s full history at Css.
As of its Q2 2026 13F filing, CSS LLC’s five largest positions were Western Digital Corp (WDC) at 3.1%, Ishares Gold Trust (IAU) at 3.0%, Kimco Realty Corp. (49446R68) at 3.0%, Penumbra Inc (PEN) at 2.4%, Ionis Pharmaceuticals Inc (IONS) at 2.4% of the reported portfolio.
CSS LLC reported a 13F portfolio worth $506.50M across 470 positions for Q2 2026. That is up 19.6% from the previous quarter.
Its largest purchases by value were Jazz Pharmaceuticals plc ($7.00M), Ionis Pharmaceuticals Inc ($5.80M), EQV Ventures Acquisition Corp. II ($5.65M). It opened 125 new positions.
Its largest sales by value were Iron Horse Acquisition II Corp. ($7.27M), Spdr Gold Trust ($5.43M), Inflection Point Acquisition Corp. VI ($4.11M). It exited 92 positions entirely.
From the Form 13F-HR reports CSS LLC files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.