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CSS Llc/il
CSS LLC/IL is a Chicago-based proprietary trading and investment firm founded in 1988. The firm specializes in quantitative trading strategies and market making across a diverse range of financial instruments, serving institutional clients and actively participating in global financial markets. CSS employs financial professionals and technologists to develop algorithmic trading systems and risk management infrastructure, with a focus on statistical analysis and technology-driven solutions.
Investment Strategy
CSS LLC/IL employs proprietary, quantitative, and technology-driven trading strategies, including arbitrage, market making, and systematic trading in multiple asset classes. The firm leverages advanced statistical models, technological infrastructure, and algorithmic systems to identify inefficiencies in global markets, aiming for steady, risk-adjusted returns. Its strategies typically involve rapid execution, liquidity provision, and risk management, with an emphasis on minimizing directional exposure and maximizing diversification.
Latest 13F Filing Activity
CSS Llc/il filed their most recent 13F report on Jun 30, 2025 disclosing 495 equity positions and 277 options positions with a total 13F market value of $2B. The fund increased holdings in Brightspring Health SVCS Inc., Nextera Energy Inc., Bank America Corp. among other positions. CSS Llc/il reduced exposure to Axon Enterprise Inc., Vanguard Index FDS, Apollo Global MGMT Inc. among others.
Top Holdings
Equity Positions (495)
| Ticker | Security | Weight | Market Value | Shares | Avg Cost | Price | Change (QoQ) |
|---|---|---|---|---|---|---|---|
| BRIGHTSPRING HEALTH SVCS INC | 1.54% | $33.0M | 400,466 | $82.55 | $82.55 | +$33.0M | |
| NEXTERA ENERGY INC | 1.41% | $30.3M | 761,694 | $39.75 | $39.74 | +$30.1M | |
| BANK AMERICA CORP | 1.07% | $22.9M | 18,894 | $1213.42 | $1213.00 | +$22.4M | |
R RSP | INVESCO EXCHANGE TRADED FD T | 0.75% | $16.2M | 88,932 | $168.59 | $181.74 | -$985.9K |
V VOO | VANGUARD INDEX FDS | 0.74% | $15.9M | 27,990 | $489.76 | $568.03 | -$18.3M |
Options Positions (277)
| Ticker | Security | Action | Type | Notional Value | Contracts | Underlying Price | Premium Paid | Change (Contracts) | Change (Value) |
|---|---|---|---|---|---|---|---|---|---|
M MSTR | MICROSTRATEGY INC | Bought | Put | $110.6M | 2,735 | $404.23 | $193.58 | +231 | +$38.4M |
S SPY | SPDR S&P 500 ETF TR | Bought | Call | $45.7M | 740 | $617.85 | $602.39 | +380 | +$25.6M |
G GME | GAMESTOP CORP NEW | Bought | Put | $35.1M | 14,405 | $24.39 | $23.93 | +10,223 | +$25.8M |
S SPY | SPDR S&P 500 ETF TR | Bought | Put | $29.7M | 480 | $617.85 | $517.81 | +30 | +$4.5M |
N NEE | NEXTERA ENERGY INC | Bought | Call | $16.6M | 2,395 | $69.42 | $69.45 | +2,345 | +$16.3M |
Industry Allocation
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