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Livermore
Livermore
ZHEN

Castleark Management LLC

SEC CIK
0001106832
Latest filing
Aug 14, 2026

The latest 13F from Castleark Management LLC covers Q2 2026 (filed Aug 14, 2026): 309 long positions worth $3.71B. The top 10 holdings make up 33.9% of the portfolio, and the largest is NVIDIA Corp (NVDA) at 7.0%. 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
58
Est. +$314.9M
Added
69
Est. +$488.1M
Reduced
89
Est. −$455.3M
Sold out
41
Est. −$190.7M

Top 5 holdings

Share of this quarter's portfolio value

  1. NVDANVIDIA Corp
    7.0%$260.0MHistory
  2. GOOGLAlphabet Inc.
    4.9%$181.2MHistory
  3. AAPLApple Inc.
    3.7%$136.6MHistory
  4. LRCXLam Research Corp
    3.3%$123.0MHistory
  5. MSFTMicrosoft Corp
    2.9%$109.2MHistory

Biggest buys

New and added positions, by estimated amount bought

  1. MSMorgan Stanley
    +$38.6MAddedHistory
  2. AAPLApple Inc.
    +$35.3MAddedHistory
  3. GOOGLAlphabet Inc.
    +$31.8MAddedHistory
  4. VVisa Inc.
    +$28.3MAddedHistory
  5. GILDGilead Sciences, Inc.
    +$23.4MAddedHistory

Largest weight increases

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

  1. AMDAdvanced Micro Devices Inc
    +1.26 pp0.6% → 1.9%History
  2. MSMorgan Stanley
    +1.05 pp0.1% → 1.2%History
  3. GOOGLAlphabet Inc.
    +0.91 pp4.0% → 4.9%History
  4. AAPLApple Inc.
    +0.74 pp2.9% → 3.7%History
  5. VVisa Inc.
    +0.65 pp1.5% → 2.2%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. SCHWSchwab Charles Corp
    −$45.6MReducedHistory
  2. ULTAUlta Beauty, Inc.
    −$26.5MSold outHistory
  3. SHOPShopify Inc.
    −$25.5MReducedHistory
  4. DOCNDigitalOcean Holdings, Inc.
    −$23.0MReducedHistory
  5. LRCXLam Research Corp
    −$22.9MReducedHistory

Largest weight decreases

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

  1. SCHWSchwab Charles Corp
    −1.54 pp1.6% → <0.1%History
  2. SHOPShopify Inc.
    −0.95 pp1.2% → 0.3%History
  3. METAMeta Platforms, Inc.
    −0.92 pp2.3% → 1.4%History
  4. CVXChevron Corp
    −0.88 pp0.9% → 0.1%History
  5. ULTAUlta Beauty, Inc.
    −0.88 pp0.9% → 0.0%History

Metrics

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

Portfolio value
$3.71B
+$687.2M (+22.7%) vs. prior quarter
Positions
309
+17 vs. prior quarter
Top 10 concentration
33.9%
Top 10 as share of value
Turnover
19.2%
Q2 2026, one quarter
Average holding period
10.8 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 $3.71B (Q2 2026)

Q1 2021: $2.78BQ2 2021: $2.98BQ3 2021: $2.62BQ4 2021: $2.72BQ1 2022: $2.32BQ2 2022: $1.87BQ3 2022: $1.80BQ4 2022: $1.91BQ1 2023: $2.04BQ2 2023: $2.21BQ3 2023: $1.96BQ4 2023: $2.26BQ1 2024: $2.40BQ2 2024: $2.45BQ3 2024: $2.45BQ4 2024: $2.87BQ1 2025: $2.89BQ2 2025: $3.33BQ3 2025: $3.57BQ4 2025: $3.41BQ1 2026: $3.02BQ2 2026: $3.71B
Q1 2021Q2 2026
13F filings of Castleark Management LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 14, 2026309$3.71BNVDAGOOGLAAPLvs. Q1 2026SEC
Q1 2026May 15, 2026292$3.02BNVDAGOOGLMSFTvs. Q4 2025SEC
Q4 2025Feb 13, 2026294$3.41BNVDAMSFTGOOGLvs. Q3 2025SEC
Q3 2025Nov 17, 2025284$3.57BAdvisors Inner Circle FD IINVDAMSFTvs. Q2 2025SEC
Q2 2025Aug 18, 2025275$3.33BAdvisors Inner Circle FD IINVDAMSFTvs. Q1 2025SEC
Q1 2025May 15, 2025280$2.89BAdvisors Inner Circle FD IIAAPLNVDAvs. Q4 2024SEC
Q4 2024Feb 18, 2025283$2.87BAAPLNVDAMSFTvs. Q3 2024SEC
Q3 2024Nov 15, 2024272$2.45BMSFTNVDAAAPLvs. Q2 2024SEC
Q2 2024Aug 14, 2024271$2.45BNVDAMSFTAAPLvs. Q1 2024SEC
Q1 2024May 16, 2024278$2.40BMSFTNVDAAAPLvs. Q4 2023SEC
Q4 2023Feb 15, 2024281$2.26BMSFTAAPLNVDAvs. Q3 2023SEC
Q3 2023Nov 15, 2023274$1.96BMSFTAAPLNVDAvs. Q2 2023SEC
Q2 2023Aug 16, 2023274$2.21BMSFTAAPLNVDAvs. Q1 2023SEC
Q1 2023May 16, 2023272$2.04BAAPLMSFTMAvs. Q4 2022SEC
Q4 2022Feb 10, 2023282$1.91BAAPLMSFTMAvs. Q3 2022SEC
Q3 2022Nov 15, 2022284$1.80BMSFTAAPLMAvs. Q2 2022SEC
Q2 2022Aug 16, 2022306$1.87BMSFTAAPLGOOGLvs. Q1 2022SEC
Q1 2022May 16, 2022321$2.32BMSFTAAPLGOOGLvs. Q4 2021SEC
Q4 2021Feb 16, 2022326$2.72BMSFTAAPLGOOGLvs. Q3 2021SEC
Q3 2021Nov 12, 2021328$2.62BMSFTAAPLAMZNvs. Q2 2021SEC
Q2 2021Aug 17, 2021335$2.98BMSFTAAPLAMZNvs. Q1 2021SEC
Q1 2021May 14, 2021330$2.78BMSFTAAPLAMZN–SEC