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Livermore
Livermore
ZHEN

Castleark Management LLC

SEC CIK
0001106832
Latest filing
Aug 14, 2026

MPLX holding history

MPLX LP in every 13F filed by Castleark Management LLC, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

MPLX overviewAll 13F holders of MPLXFull Q2 2026 holdings

Shares (Q2 2026)
32,092
Value
$1.81M
% of portfolio
<0.1%
Quarters held
22
Since Q1 2021
Holdings of MPLX by Castleark Management LLC, by quarter
QuarterSharesValue% of portfolioShare changeActionAll holders
Q2 202632,092$1.81M<0.1%−9,800−23.4%ReducedHolders
Q1 202641,892$2.39M0.1%−11,220−21.1%ReducedHolders
Q4 202553,112$2.83M0.1%−7,510−12.4%ReducedHolders
Q3 202560,622$3.03M0.1%00.0%UnchangedHolders
Q2 202560,622$3.12M0.1%−9,510−13.6%ReducedHolders
Q1 202570,132$3.75M0.1%−59,510−45.9%ReducedHolders
Q4 2024129,642$6.20M0.2%00.0%UnchangedHolders
Q3 2024129,642$5.76M0.2%00.0%UnchangedHolders
Q2 2024129,642$5.52M0.2%00.0%UnchangedHolders
Q1 2024129,642$5.39M0.2%00.0%UnchangedHolders
Q4 2023129,642$4.76M0.2%00.0%UnchangedHolders
Q3 2023129,642$4.61M0.2%00.0%UnchangedHolders
Q2 2023129,642$4.40M0.2%−29,230−18.4%ReducedHolders
Q1 2023158,872$5.47M0.3%+9,540+6.4%AddedHolders
Q4 2022149,332$4.90M0.3%00.0%UnchangedHolders
Q3 2022149,332$4.48M0.2%−37,330−20.0%ReducedHolders
Q2 2022186,662$5.44M0.3%00.0%UnchangedHolders
Q1 2022186,662$6.19M0.3%00.0%UnchangedHolders
Q4 2021186,662$5.52M0.2%−63,500−25.4%ReducedHolders
Q3 2021250,162$7.12M0.3%−9,880−3.8%ReducedHolders
Q2 2021260,042$7.70M0.3%00.0%UnchangedHolders
Q1 2021260,042$6.67M0.2%––Holders

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.