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CSS LLC/IL

Institutional InvestorSimilar funds →SEC EDGAR: CIK 1103646
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Sector Allocation

  • Technology26.6%$599.0M
  • Other20.6%$464.8M
  • Financials20.6%$464.7M
  • Healthcare7.5%$170.2M
  • Communication Services6.9%$156.3M
  • Industrials5.5%$123.7M
  • Materials3.2%$72.3M
  • Energy2.6%$58.0M
  • Utilities2.4%$53.2M
  • Consumer Discretionary1.8%$40.2M

AUM History

13fpro.ai/research/fund/css-llc-il-1103646

Conviction and streaks

Concentrating · top 10 = 39.9%

From the fund's last 12 quarters of 13F filings: positions held longest at size, and names it added to or trimmed several quarters running.

LITE$LITEConviction hold10.9% weight · held 5 quarters$Conviction hold6.6% weight · held 4 quartersECHO$ECHOConviction hold6.1% weight · held 4 quartersAPO$APOConviction hold3.7% weight · held 8 quartersBAC$BACConviction hold2.8% weight · held 6 quarters$Accumulating+30% shares · 7 quarters runningPCG$PCGAccumulating+22066% shares · 5 quarters runningECHO$ECHOAccumulating+281% shares · 4 quarters runningAKAM$AKAMAccumulating+382% shares · 4 quarters runningIVZ$IVZAccumulating+17% shares · 4 quarters runningBCS$BCSTrimming-54% shares · 6 quarters runningC$CTrimming-67% shares · 6 quarters runningGAM$GAMTrimming-27% shares · 5 quarters runningGGZ$GGZTrimming-29% shares · 5 quarters runningCCRN$CCRNTrimming-81% shares · 5 quarters running

Largest positions — Q2 2026

Top 20 stock positions. Options are left out: 13F reports them at the underlying's value.

13fpro.ai/research/fund/css-llc-il-1103646

CSS LLC/IL 13F holdings — Q2 2026

$2.6B portfolio (+23.0% QoQ) · 1,001 holdings · Q2 2026 13F · top 10 are 40% of the stock portfolio

Includes $314.3M of put/call options ($243.8M puts, $70.5M calls), which 13F rules report at the value of the underlying shares, not the premium at risk. Stocks alone: $2.3B. Weights use the stock portfolio.

All holdings — CSS LLC/IL (Q2 2026)

1,001 disclosed positions from the Form 13F-HR on SEC EDGAR, with quarter-over-quarter share changes. Largest by value first; the ten above are not repeated. The page lists up to 1,000; every position is in the Excel export.

Company
AKAM$AKAMAKAMAI TECHNOLOGIES INCnote$29.6M+58%
GME$GMEPUTGameStop Corp.$27.2M+1%
ALB$ALBALBEMARLE CORP$26.1M+88%
CNP$CNPCENTERPOINT ENERGY INCnote$25.3M—
EQX$EQXEquinox Gold Corp.note$25.1M+88%
BA$BABOEING COpreferred$23.6MNew
RIG$RIGTransocean Ltd.$23.5M-38%
— EL PASO ENERGY CAP TR I - PFD CV TR SEC 28preferred$22.6M+97%
IVZ$IVZInvesco Ltd.$22.1M+0.6%
— VANGUARD INDEX FDS - S&P 500 ETF SHSetf/fund$22.1M—
KMI$KMIPUTKINDER MORGAN, INC.$21.7MNew
IREN$IRENIREN Ltdnote$21.2MNew
DOCN$DOCNDigitalOcean Holdings, Inc.note$19.5MNew
PTCT$PTCTPTC THERAPEUTICS, INC.note$18.6M+316%
SNOW$SNOWSnowflake Inc.note$16.5M-28%

What changed in Q2 2026

Against the previous quarter's 13F: 284 new, 242 added to, 247 trimmed, 243 sold out. Share-count changes; largest moves by dollar size first.

New positions (284)

  • MCHP$MCHPMICROCHIP TECHNOLOGY INC$43.0M

    first bought this quarter

  • BA$BABOEING CO$23.6M

    first bought this quarter

  • KMI$KMIPUTKINDER MORGAN, INC.$21.7M

    first bought this quarter

  • IREN$IRENIREN Ltd$21.2M

    first bought this quarter

  • DOCN$DOCNDigitalOcean Holdings, Inc.$19.5M

    first bought this quarter

  • ALPHABET INC - DEP SHS RP1/20 B$13.4M

    first bought this quarter

+278 more in the Excel export

Added to (242)

  • HEWLETT PACKARD ENTERPRISE C - 7.625 MAND CONV+1015%

    now $149.3M

  • APO$APOApollo Global Management, Inc.+391%

    now $82.8M · held 8 qtrs, 2 adds in a row

  • BAC$BACBANK OF AMERICA CORP /DE/+388%

    now $63.3M · held 10+ qtrs

  • WOLF$WOLFWOLFSPEED, INC.+49%

    now $54.2M · held 8 qtrs, 3 adds in a row

  • NET$NETCloudflare, Inc.+95%

    now $33.5M · held 2 qtrs, 2 adds in a row

  • PTCT$PTCTPTC THERAPEUTICS, INC.+316%

    now $18.6M · held 7 qtrs

+236 more in the Excel export

Trimmed (247)

  • LYV$LYVLive Nation Entertainment, Inc.-100%

    now $1.4M

  • SO$SOSOUTHERN CO-100%

    now $630K

  • GWRE$GWREGuidewire Software, Inc.-100%

    now $320K

  • FLNC$FLNCFluence Energy, Inc.-99%

    now $1.1M

  • CLSK$CLSKCLEANSPARK, INC.-100%

    now $218K

  • FE$FEFIRSTENERGY CORP-99%

    now $569K

+241 more in the Excel export

Sold out (243)

  • JAZZ INVESTMENTS I LTDwas $63.9M
  • LRN$LRNStride, Inc.was $17.8M

    held 9+ qtrs

  • HOLX$HOLXPUTHOLOGIC INCwas $12.8M
  • MASI$MASICALLMASIMO CORPwas $9.6M
  • CSGS$CSGSCSG SYSTEMS INTERNATIONAL INCwas $9.1M

    held 2 qtrs

  • HOLX$HOLXHOLOGIC INCwas $8.9M

    held 7 qtrs

+237 more in the Excel export

Share

Holdings by quarter

Every 13F CSS LLC/IL has filed, 41 earlier quarters. Pick one to see what it held then.

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Is it too late to follow CSS?

Q2 2026 13F filed with the SEC on Aug 14, 2026. Prices are closing prices as of Oct 26, 2026.

Average quality of CSS's top 20 holdings: 46/100 (our AI quality score, weighted by position size; 17 of the 20 are scored)

Top 10 since filing

-13.5%

Value-weighted move of the 10 largest stock positions

Turnover

43%

Last quarter; 141% over the last 4

Top 10 weight

40%

Share of the stock portfolio in its 10 largest positions

Held 4+ quarters

70%

Share of portfolio value in positions held a year or more

Highest-quality names it owns(among its 100 largest positions)

The 8 highest-scoring companies in this portfolio are a Pro feature.

How these are measured
  • Moves since the quarter-end and since the filing date use our own daily closing prices, from the close on (or just before) each date to the latest close.
  • Turnover is the lesser of shares bought or sold in a quarter, valued at the quarter-end prices in the 13F, divided by the average of the two quarters' stock portfolio values.
  • Quarters held and add/trim streaks count back only through quarters whose filed holdings add up to the filing's own cover-page total (back to Q1 2024 for this fund). A change counts as an add or a trim when the split-adjusted share count moves by more than 1%.
  • Estimate, not the fund's reported cost. For each quarter in the current holding period in which the fund's share count rose (split-adjusted), we take that quarter's average daily close and weight it by the shares added; sales do not change an average cost. Quarters where the stock's price history and the 13F's own implied price disagree by more than 2x are left out.
  • Put and call option rows report the value of the underlying shares, not a position the fund paid for, so they are left out of all of the above.

Portfolio Overview

CSS LLC/IL disclosed 1,001 positions worth $2.6B in its Form 13F-HR for Q2 2026 — $2.3B in common stock plus $314.3M of put/call option positions (reported at underlying notional value, not premium at risk), led by $LITE (Lumentum Holdings Inc.) at 10.9% of the equity portfolio. During the quarter the fund opened 284 new positions and exited 243 — including a new stake in $MCHP. The portfolio is most concentrated in Technology (26.6% of disclosed assets). All figures are sourced directly from CSS LLC/IL’s Form 13F-HR filing with the SEC under CIK 1103646.

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AI-Powered Hedge Fund Analysis: CSS LLC/IL

13F Pro is an AI hedge fund tracker and stock research platform. For CSS LLC/IL (SEC CIK: 1103646), the platform ingests every quarterly Form 13F filing and applies AI-powered analysis on top — 10 specialized AI analysts (value, growth, momentum, macro, activist, and more) debate the fund's top positions and publish AI-generated analysis with cited SEC sources.

Every holding in CSS LLC/IL's portfolio is scored on an AI quality ranking built from its SEC filings (ROIC, FCF margin, revenue growth, institutional flow, earnings quality, shareholder dilution, and more). Track accumulation and distribution quarter over quarter, identify conviction positions, and see AI stock analysis for each position — alongside 8,700+ other institutional filers and 2,800+ AI-ranked companies.