CSS LLC/IL

Q1 2026 13F-HR Holdings

Location
Chicago, IL
Holdings as of
3/31/2026
Date filed
5/15/2026
Form type
13F-HR
Num holdings
961
Total value ($000)
$2,087,843
Net value change ($000)
-161,940 (-7.2%)
New positions
143
Sold out positions
143
Turnover %
40.0%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/17/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
NEE 27,226 NEW
APO 15,333 1605.5%
ALB 14,995 510.4%
PEN 11,867 NEW
KMI 10,464 953.0%
HOLX 7,750 664.1%
IRHO 7,272 NEW
HPE 6,375 589.7%
IONS 5,939 NEW
TRG LATIN AMER ACQUIS CORP 5,306 NEW
Top Reduces (Value $000, Stocks/ETFs)
BAC -17,204 -58.3%
SOFI -9,395 -100.0%
IRHO -7,340 -100.0%
SPY -7,260 -100.0%
DMII -6,882 -86.3%
ITHA -5,922 -100.0%
MESH -4,465 -100.0%
SWZ -4,267 -41.4%
RKLB -3,809 -92.3%
QXO -3,761 -100.0%
Instrument mix + QoQ Δ (ex-options)
Derivatives reported exposure ($000): 289,935 (13.9% of total reported value)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type