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Livermore
Livermore
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CSS LLC

SEC CIK
0001103646
Latest filing
Aug 14, 2026

The latest 13F from CSS LLC covers Q2 2026 (filed Aug 14, 2026): 766 long positions worth $2.25B. The top 10 holdings make up 39.9% of the portfolio, and the largest is Lumentum Hldgs Inc at 10.9%. Livermore has 22 filings on Form 13F from this institution, going back to Q1 2021.

What changed in Q2 2026

Share counts compared with Q1 2026: how many positions were new, added to, reduced or sold out, and the biggest buys and sells. Dollar amounts are estimated at the quarter-end prices implied by the filing.

Full comparison
New
211
Est. +$418.4M
Added
170
Est. +$371.5M
Reduced
177
Est. −$79.2M
Sold out
184
Est. −$357.0M

Top 5 holdings

Share of this quarter's portfolio value

  1. Lumentum Hldgs Inc55024UAF6
    10.9%$245.6M
  2. Hewlett Packard Enterprise C42824C208
    6.6%$149.3M
  3. ECHOEchoStar CORP
    6.1%$137.4MHistory
  4. Apollo Global Mgmt Inc03769M304
    3.7%$82.8M
  5. Bank of Amer Corp060505682
    2.8%$63.3M

Biggest buys

New and added positions, by estimated amount bought

  1. Hewlett Packard Enterprise C42824C208
    +$135.9MAdded
  2. Apollo Global Mgmt Inc03769M304
    +$65.9MAdded
  3. Bank of Amer Corp060505682
    +$50.3MAdded
  4. SMCIPSuper Micro Computer, Inc.
    +$45.3MNewHistory
  5. MCHPPMicrochip Technology Inc
    +$43.0MNewHistory

Largest weight increases

New and added positions, by percentage points of the portfolio gained

  1. Hewlett Packard Enterprise C42824C208
    +6.21 pp0.4% → 6.6%
  2. Apollo Global Mgmt Inc03769M304
    +2.77 pp0.9% → 3.7%
  3. Bank of Amer Corp060505682
    +2.12 pp0.7% → 2.8%
  4. SMCIPSuper Micro Computer, Inc.
    +2.01 pp0.0% → 2.0%History
  5. MCHPPMicrochip Technology Inc
    +1.91 pp0.0% → 1.9%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. Jazz Investments I Ltd472145AF8
    −$63.9MSold out
  2. Live Nation Entertainment IN538034BA6
    −$49.9MSold out
  3. LRNStride, Inc.
    −$17.8MSold outHistory
  4. Nextera Energy Inc65339F655
    −$17.7MReduced
  5. CSG Sys Intl Inc126349AH2
    −$9.13MSold out

Largest weight decreases

Reduced and sold-out positions, by percentage points of the portfolio lost

  1. Jazz Investments I Ltd472145AF8
    −3.56 pp3.6% → 0.0%
  2. Live Nation Entertainment IN538034BA6
    −2.77 pp2.8% → 0.0%
  3. Nextera Energy Inc65339F655
    −1.15 pp1.5% → 0.4%
  4. LRNStride, Inc.
    −0.99 pp1.0% → 0.0%History
  5. CSG Sys Intl Inc126349AH2
    −0.51 pp0.5% → 0.0%

Metrics

13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.

Portfolio value
$2.25B
+$456.3M (+25.4%) vs. prior quarter
Positions
766
+27 vs. prior quarter
Top 10 concentration
39.9%
Top 10 as share of value
Turnover
21.5%
Q2 2026, one quarter
Average holding period
5.1 quarters
Weighted by value

How these are calculated

  • Portfolio value: the market value of all long positions in the 13F, as reported at quarter end, excluding options.
  • Top 10 concentration: the combined value of the 10 largest positions as a share of portfolio value.
  • Turnover: the smaller of this quarter's estimated purchases and estimated sales, divided by the average of this and last quarter's portfolio value. Estimates multiply the change in shares by the quarter-end price implied by the filing (market value divided by shares); new positions use this quarter's value and sold-out positions last quarter's. Only positions reported in shares count, and it is not calculated when the previous quarter was not filed.
  • Average holding period: how many consecutive quarters each current position has been held (including this one; a quarter without the position or without a filing starts the count over), weighted by this quarter's value. Counting starts with the first 13F in Livermore (Q1 2021), so positions held before then are understated.

13F filings by quarter

22 quarters, going back to Q1 2021. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $2.37B (Q1 2022)

Q1 2021: $1.86BQ2 2021: $1.89BQ3 2021: $1.88BQ4 2021: $2.25BQ1 2022: $2.37BQ2 2022: $2.08BQ3 2022: $1.73BQ4 2022: $1.53BQ1 2023: $1.32BQ2 2023: $1.30BQ3 2023: $1.20BQ4 2023: $1.28BQ1 2024: $1.23BQ2 2024: $1.36BQ3 2024: $1.72BQ4 2024: $1.68BQ1 2025: $1.43BQ2 2025: $1.58BQ3 2025: $1.68BQ4 2025: $1.77BQ1 2026: $1.80BQ2 2026: $2.25B
Q1 2021Q2 2026
13F filings of CSS LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 14, 2026766$2.25BLumentum Hldgs IncHewlett Packard Enterprise CECHOvs. Q1 2026SEC
Q1 2026May 15, 2026739$1.80BLumentum Hldgs IncECHOJazz Investments I Ltdvs. Q4 2025SEC
Q4 2025Feb 17, 2026751$1.77BECHOLumentum Hldgs IncJazz Investments I Ltdvs. Q3 2025SEC
Q3 2025Nov 13, 2025691$1.68BLRNIonis Pharmaceuticals IncLive Nation Entertainment INvs. Q2 2025SEC
Q2 2025Aug 14, 2025673$1.58BLRNIonis Pharmaceuticals IncJazz Investments I Ltdvs. Q1 2025SEC
Q1 2025May 15, 2025630$1.43BAmerican Airls Group IncLRNInsmed Incvs. Q4 2024SEC
Q4 2024Feb 18, 2025639$1.68BAxon Enterprise IncAmerican Airls Group IncLRNvs. Q3 2024SEC
Q3 2024Nov 14, 2024596$1.72BAxon Enterprise IncCCLAmerican Airls Group Incvs. Q2 2024SEC
Q2 2024Aug 14, 2024571$1.36BRoyal Caribbean GroupAmerican Airls Group IncMacom Tech Solutions Hldgs Ivs. Q1 2024SEC
Q1 2024May 15, 2024566$1.23BRoyal Caribbean GroupAmerican Airls Group IncMacom Tech Solutions Hldgs Ivs. Q4 2023SEC
Q4 2023Feb 14, 2024538$1.28BRoyal Caribbean GroupNEAmerican Airls Group Incvs. Q3 2023SEC
Q3 2023Nov 14, 2023567$1.20BRoyal Caribbean GroupNEAmerican Airls Group Incvs. Q2 2023SEC
Q2 2023Aug 14, 2023595$1.30BDexcom IncNEAmerican Airls Group Incvs. Q1 2023SEC
Q1 2023May 15, 2023564$1.32BDexcom IncPG&E CorpNEvs. Q4 2022SEC
Q4 2022Feb 14, 2023698$1.53BDexcom IncPG&E CorpEXEvs. Q3 2022SEC
Q3 2022Nov 14, 2022754$1.73BAntero Resources CorpDexcom IncGFL Environmental Incvs. Q2 2022SEC
Q2 2022Aug 15, 2022828$2.08BBroadcom IncAntero Resources CorpDexcom Incvs. Q1 2022SEC
Q1 2022May 16, 2022888$2.37BBroadcom IncDexcom IncAntero Resources Corpvs. Q4 2021SEC
Q4 2021Feb 14, 2022980$2.25BBroadcom IncDexcom IncAntero Resources Corpvs. Q3 2021SEC
Q3 2021Nov 15, 2021933$1.88BDexcom IncWayfair IncNextera Energy Incvs. Q2 2021SEC
Q2 2021Aug 16, 2021834$1.89BDexcom IncWayfair IncChegg Incvs. Q1 2021SEC
Q1 2021May 17, 2021704$1.86BWayfair IncDexcom IncAAL–SEC