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Livermore
Livermore
ZHEN

Shelter Mutual Insurance Co

SEC CIK
0001455288
Latest filing
Aug 11, 2026

The latest 13F from Shelter Mutual Insurance Co covers Q2 2026 (filed Aug 11, 2026): 58 long positions worth $472.8M. The top 10 holdings make up 40.0% of the portfolio, and the largest is iShares Core S&P 500 ETF at 6.7%. 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
0
Added
1
Est. +$7.32M
Reduced
2
Est. −$7.08M
Sold out
0

Top 5 holdings

Share of this quarter's portfolio value

  1. iShares Core S&P 500 ETF464287200
    6.7%$31.7M
  2. Vanguard Star FDS921909768
    5.7%$26.9M
  3. BRK.ABerkshire Hathaway Inc
    5.4%$25.5MHistory
  4. CATCaterpillar Inc
    3.8%$17.8MHistory
  5. Vanguard Morningstar Total Stock Market ETF922908769
    3.4%$16.2M

Share of portfolio

Top 5 holdings and the other 53 positions, by share of portfolio value

  1. iShares Core S&P 500 ETF6.7%
  2. Vanguard Star FDS5.7%
  3. BRK.A5.4%
  4. CAT3.8%
  5. Vanguard Morningstar Total Stock Market ETF3.4%
  6. Other 53 positions75.0%

Biggest buys

New and added positions, by estimated amount bought

  1. iShares Core S&P 500 ETF464287200
    +$7.32MAdded

Largest weight increases

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

  1. iShares Core S&P 500 ETF464287200
    +1.97 pp4.7% → 6.7%

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. CATCaterpillar Inc
    −$4.25MReducedHistory
  2. QCOMQualcomm Inc
    −$2.83MReducedHistory

Largest weight decreases

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

  1. QCOMQualcomm Inc
    −0.06 pp1.5% → 1.4%History

Metrics

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

Portfolio value
$472.8M
+$23.1M (+5.1%) vs. prior quarter
Positions
58
0 vs. prior quarter
Top 10 concentration
40.0%
Top 10 as share of value
Turnover
1.5%
Q2 2026, one quarter
Average holding period
20.6 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 $472.8M (Q2 2026)

Q1 2021: $356.1MQ2 2021: $358.5MQ3 2021: $354.8MQ4 2021: $385.6MQ1 2022: $381.3MQ2 2022: $330.1MQ3 2022: $308.8MQ4 2022: $348.4MQ1 2023: $358.8MQ2 2023: $411.6MQ3 2023: $358.4MQ4 2023: $362.5MQ1 2024: $388.1MQ2 2024: $384.3MQ3 2024: $418.7MQ4 2024: $401.2MQ1 2025: $414.8MQ2 2025: $431.4MQ3 2025: $445.9MQ4 2025: $448.3MQ1 2026: $449.8MQ2 2026: $472.8M
Q1 2021Q2 2026
13F filings of Shelter Mutual Insurance Co by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 11, 202658$472.8MiShares Core S&P 500 ETFVanguard Star FDSBRK.Avs. Q1 2026SEC
Q1 2026Apr 29, 202658$449.8MBRK.AVanguard Star FDSiShares Core S&P 500 ETFvs. Q4 2025SEC
Q4 2025Feb 13, 202658$448.3MBRK.AVanguard Star FDSiShares Core S&P 500 ETFvs. Q3 2025SEC
Q3 2025Oct 31, 202558$445.9MBRK.AORCLVanguard Star FDSvs. Q2 2025SEC
Q2 2025Jul 29, 202558$431.4MBRK.AVanguard Star FDSORCLvs. Q1 2025SEC
Q1 2025Apr 22, 202557$414.8MBRK.AVanguard Star FDSiShares Broad Usd Investment Grade Corporate Bond ETFvs. Q4 2024SEC
Q4 2024Feb 7, 202557$401.2MBRK.AVanguard Star FDSWMTvs. Q3 2024SEC
Q3 2024Nov 8, 202457$418.7MBRK.AVanguard Star FDSORCLvs. Q2 2024SEC
Q2 2024Jul 25, 202458$384.3MBRK.AVanguard Star FDSiShares Broad Usd Investment Grade Corporate Bond ETFvs. Q1 2024SEC
Q1 2024May 6, 202468$388.1MBRK.AVanguard Star FDSiShares Broad Usd Investment Grade Corporate Bond ETFvs. Q4 2023SEC
Q4 2023Jan 31, 202458$362.5MBRK.AVanguard Star FDSiShares Broad Usd Investment Grade Corporate Bond ETFvs. Q3 2023SEC
Q3 2023Nov 2, 202360$358.4MBRK.AVanguard Star FDSiShares Broad Usd Investment Grade Corporate Bond ETFvs. Q2 2023SEC
Q2 2023Aug 1, 202367$411.6MBRK.AVanguard Star FDSiShares Broad Usd Investment Grade Corporate Bond ETFvs. Q1 2023SEC
Q1 2023Apr 18, 202354$358.8MBRK.AVanguard Star FDSVvs. Q4 2022SEC
Q4 2022Jan 20, 202354$348.4MBRK.AVanguard Star FDSVvs. Q3 2022SEC
Q3 2022Oct 14, 202253$308.8MBRK.AVanguard Star FDSVRTXvs. Q2 2022SEC
Q2 2022Jul 12, 202254$330.1MBRK.AVanguard Star FDSVRTXvs. Q1 2022SEC
Q1 2022May 16, 202253$381.3MBRK.AVanguard Star FDSVRSKvs. Q4 2021SEC
Q4 2021Feb 1, 202252$385.6MVanguard Star FDSBRK.ALOWvs. Q3 2021SEC
Q3 2021Oct 8, 202152$354.8MVanguard Star FDSBRK.AVvs. Q2 2021SEC
Q2 2021Aug 2, 202150$358.5MVanguard Star FDSBRK.AVvs. Q1 2021SEC
Q1 2021Apr 22, 202152$356.1MVanguard Star FDSVBRK.A–SEC