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Livermore
Livermore
ZHEN

Check Capital Management Inc

SEC CIK
0001032814
Latest filing
Aug 5, 2026

The latest 13F from Check Capital Management Inc covers Q2 2026 (filed Aug 5, 2026): 52 long positions worth $1.77B. The top 10 holdings make up 89.5% of the portfolio, and the largest is Berkshire Hathaway Inc (BRK.B) at 31.7%. Livermore has 28 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
5
Est. +$1.11M
Added
19
Est. +$19.3M
Reduced
11
Est. −$11.6M
Sold out
2
Est. −$575.4K

Top 5 holdings

Share of this quarter's portfolio value

  1. BRK.BBerkshire Hathaway Inc
    31.7%$560.0MHistory
  2. Alphabet Class C38259P706
    13.3%$235.9M
  3. BNBROOKFIELD Corp
    10.6%$187.8MHistory
  4. MKLMarkel Group Inc.
    8.7%$154.7MHistory
  5. AERAerCap Holdings N.V.
    6.7%$117.8MHistory

Share of portfolio

Top 5 holdings and the other 47 positions, by share of portfolio value

  1. BRK.B31.7%
  2. Alphabet Class C13.3%
  3. BN10.6%
  4. MKL8.7%
  5. AER6.7%
  6. Other 47 positions29.0%

Biggest buys

New and added positions, by estimated amount bought

  1. BRK.BBerkshire Hathaway Inc
    +$5.35MAddedHistory
  2. MKLMarkel Group Inc.
    +$4.54MAddedHistory
  3. FRFHFFairfax Financial Holdings Ltd
    +$2.89MAddedHistory
  4. HSYHershey Co
    +$2.27MAddedHistory
  5. BNBROOKFIELD Corp
    +$1.25MAddedHistory

Largest weight increases

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

  1. CMPRCIMPRESS plc
    +0.60 pp2.1% → 2.7%History
  2. JEFJefferies Financial Group Inc.
    +0.21 pp1.7% → 1.9%History
  3. FRFHFFairfax Financial Holdings Ltd
    +0.16 pp<0.1% → 0.2%History
  4. AMZNAmazon Com Inc
    +0.16 pp2.6% → 2.8%History
  5. WWayfair Inc.
    +0.10 pp0.8% → 0.9%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. Alphabet Class C38259P706
    −$7.99MReduced
  2. AERAerCap Holdings N.V.
    −$1.43MReducedHistory
  3. LKQLKQ Corp
    −$808.1KReducedHistory
  4. BRK.ABerkshire Hathaway Inc
    −$748.9KReducedHistory
  5. SIRISirius XM Holdings Inc.
    −$437.1KReducedHistory

Largest weight decreases

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

  1. LKQLKQ Corp
    −0.66 pp3.5% → 2.8%History
  2. AERAerCap Holdings N.V.
    −0.26 pp6.9% → 6.7%History
  3. BRK.ABerkshire Hathaway Inc
    −0.10 pp1.3% → 1.2%History
  4. COPConocoPhillips
    −0.02 pp<0.1% → 0.0%History
  5. VZVerizon Communications Inc
    −0.01 pp<0.1% → 0.0%History

Metrics

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

Portfolio value
$1.77B
+$146.4M (+9.0%) vs. prior quarter
Positions
52
+3 vs. prior quarter
Top 10 concentration
89.5%
Top 10 as share of value
Turnover
0.7%
Q2 2026, one quarter
Average holding period
19.4 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 $1.77B (Q2 2026)

Q1 2021: $1.15BQ2 2021: $1.20BQ3 2021: $1.17BQ4 2021: $1.27BQ1 2022: $1.26BQ2 2022: $1.01BQ3 2022: $926.7MQ4 2022: $985.8MQ1 2023: $1.09BQ2 2023: $1.19BQ3 2023: $1.19BQ4 2023: $1.25BQ1 2024: $1.36BQ2 2024: $1.37BQ3 2024: $1.40BQ4 2024: $1.51BQ1 2025: $1.54BQ2 2025: $1.52BQ3 2025: $1.58BQ4 2025: $1.67BQ1 2026: $1.62BQ2 2026: $1.77B
Q1 2021Q2 2026
13F filings of Check Capital Management Inc by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 5, 2026Amended52$1.77BBRK.BAlphabet Class CBNvs. Q1 2026SEC
Q1 2026May 4, 202649$1.62BBRK.BAlphabet Class CBNvs. Q4 2025SEC
Q4 2025Feb 6, 202650$1.67BBRK.BAlphabet Class CBNvs. Q3 2025SEC
Q3 2025Nov 6, 202550$1.58BBRK.BBNAlphabet Class Cvs. Q2 2025SEC
Q2 2025Jul 25, 202549$1.52BBRK.BBNMKLvs. Q1 2025SEC
Q1 2025May 2, 202550$1.54BBRK.BBNMKLvs. Q4 2024SEC
Q4 2024Jan 30, 202553$1.51BBRK.BBNAlphabet Class Cvs. Q3 2024SEC
Q3 2024Nov 6, 202450$1.40BBRK.BBNAlphabet Class Cvs. Q2 2024SEC
Q2 2024Jul 25, 202449$1.37BBRK.BAlphabet Class CBNvs. Q1 2024SEC
Q1 2024Apr 19, 202449$1.36BBRK.BBNMKLvs. Q4 2023SEC
Q4 2023Jan 31, 202445$1.25BBRK.BBNMKLvs. Q3 2023SEC
Q3 2023Jan 31, 2024Amended45$1.19BBRK.BMKLAlphabet Class Cvs. Q2 2023SEC
Q2 2023Jan 31, 2024Amended40$1.19BBRK.BBNMKLvs. Q1 2023SEC
Q1 2023Jan 31, 2024Amended39$1.09BBRK.BBNMKLvs. Q4 2022SEC
Q4 2022Jan 31, 2024Amended38$985.8MBRK.BBNAlphabet Class Cvs. Q3 2022SEC
Q3 2022Nov 2, 202239$926.7MBRK.BBAMAlphabet Class Cvs. Q2 2022SEC
Q2 2022Jul 28, 202241$1.01BBRK.BBAMAlphabet Class Cvs. Q1 2022SEC
Q1 2022May 9, 202245$1.26BBRK.BBAMAlphabet Class Cvs. Q4 2021SEC
Q4 2021Feb 4, 202246$1.27BBRK.BBAMAlphabet Class Cvs. Q3 2021SEC
Q3 2021Nov 9, 202148$1.17BBRK.BBAMAlphabet Class Cvs. Q2 2021SEC
Q2 2021Aug 9, 202151$1.20BBRK.BBAMAlphabet Class Cvs. Q1 2021SEC
Q1 2021May 7, 202149$1.15BBRK.BBAMAlphabet Class C–SEC