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CSS Llc/il

CIK:0001103646
Hedge Fund
$0 AUM
953 holdings
Chicago, IL, US
Founded:1988
200 employees
Latest filing:Jun 30, 2025

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.

Top Buys
B
BTSGUBRIGHTSPRING HEALTH SVCS INC
+$33.0M
N
NEE-PRNEXTERA ENERGY INC
+$30.1M
B
BAC-PLBANK AMERICA CORP
+$22.4M
C
CORZWCORE SCIENTIFIC INC NEW
+$13.0M
B
BPMCBLUEPRINT MEDICINES CORP
+$7.7M
Top Sells
A
AXONAXON ENTERPRISE INC
-$20.8M
V
VOOVANGUARD INDEX FDS
-$18.3M
A
APO-PAAPOLLO GLOBAL MGMT INC
-$12.6M
A
ATIIUARCHIMEDES TECH SPAC PARTNER
-$8.3M
G
GTLS-PBCHART INDS INC
-$5.8M

Top Holdings

B
BTSGUBRIGHTSPRING HEALTH SVCS INC
+1.5%$33.0M
N
NEE-PRNEXTERA ENERGY INC
+1.4%$30.3M
B
BAC-PLBANK AMERICA CORP
+1.1%$22.9M
R
RSPINVESCO EXCHANGE TRADED FD T
+0.8%$16.2M
V
VOOVANGUARD INDEX FDS
+0.7%$15.9M

Equity Positions (495)

TickerSecurityWeightMarket ValueSharesAvg CostPriceChange (QoQ)
B
BTSGU
BRIGHTSPRING HEALTH SVCS INC1.54%$33.0M400,466$82.55$82.55+$33.0M
N
NEE-PR
NEXTERA ENERGY INC1.41%$30.3M761,694$39.75$39.74+$30.1M
B
BAC-PL
BANK AMERICA CORP1.07%$22.9M18,894$1213.42$1213.00+$22.4M
R
RSP
INVESCO EXCHANGE TRADED FD T0.75%$16.2M88,932$168.59$181.74-$985.9K
V
VOO
VANGUARD INDEX FDS0.74%$15.9M27,990$489.76$568.03-$18.3M

Options Positions (10)

TickerSecurityActionTypeNotional ValueContractsUnderlying PricePremium PaidChange (Contracts)Change (Value)
M
MSTR
MICROSTRATEGY INCBought
Put
$110.6M2,735$404.23$193.58+231+$38.4M
S
SPY
SPDR S&P 500 ETF TRBought
Call
$45.7M740$617.85$602.39+380+$25.6M
G
GME
GAMESTOP CORP NEWBought
Put
$35.1M14,405$24.39$23.93+10,223+$25.8M
S
SPY
SPDR S&P 500 ETF TRBought
Put
$29.7M480$617.85$517.81+30+$4.5M
N
NEE
NEXTERA ENERGY INCBought
Call
$16.6M2,395$69.42$69.45+2,345+$16.3M

Industry Allocation

SERVICES-PREPACKAGED SOFTWARE
+6.4%
FINANCE SERVICES
+2.7%
ELECTRIC SERVICES
+2.5%
BLANK CHECKS
+2.2%
PHARMACEUTICAL PREPARATIONS
+1.7%