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Livermore
Livermore
ZHEN

Corundum Trust Company, INC

SEC CIK
0001987720
Latest filing
Jul 29, 2026

The latest 13F from Corundum Trust Company, INC covers Q2 2026 (filed Jul 29, 2026): 28 long positions worth $37.4M. The top 10 holdings make up 74.4% of the portfolio, and the largest is 3M Co (MMM) at 17.0%. Livermore has 11 filings on Form 13F from this institution, going back to Q2 2023.

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
1
Est. +$207.4K
Added
2
Est. +$1.27K
Reduced
3
Est. −$39.9K
Sold out
21
Est. −$11.2M

Top 5 holdings

Share of this quarter's portfolio value

  1. MMM3M Co
    17.0%$6.36MHistory
  2. iShares Core S&P Small Cap ETF464287804
    12.4%$4.64M
  3. iShares Select Dividend ETF464287168
    7.9%$2.94M
  4. iShares S&P Mid-Cap 400 Growth ETF464287606
    7.0%$2.63M
  5. iShares Core S&P 500 ETF464287200
    6.6%$2.48M

Share of portfolio

Top 5 holdings and the other 23 positions, by share of portfolio value

  1. MMM17.0%
  2. iShares Core S&P Small Cap ETF12.4%
  3. iShares Select Dividend ETF7.9%
  4. iShares S&P Mid-Cap 400 Growth ETF7.0%
  5. iShares Core S&P 500 ETF6.6%
  6. Other 23 positions49.1%

Biggest buys

New and added positions, by estimated amount bought

  1. BABoeing Co
    +$207.4KNewHistory
  2. SPYSPDR S&P 500 ETF Trust
    +$746.77AddedHistory
  3. iShares MSCI Eafe ETF464287465
    +$519.4Added

Largest weight increases

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

  1. iShares MSCI Eafe ETF464287465
    +0.70 pp2.8% → 3.5%
  2. SPYSPDR S&P 500 ETF Trust
    +0.63 pp1.8% → 2.5%History
  3. BABoeing Co
    +0.55 pp0.0% → 0.6%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. SKESkeena Resources Ltd
    −$1.64MSold outHistory
  2. Discovery Silver Ord254677107
    −$1.59MSold out
  3. GGPSFGreatland Resources Limited
    −$1.12MSold outHistory
  4. Lundin Gold Inc Com550371108
    −$838.2KSold out
  5. Wesdome Gold Mines Ltd95083R100
    −$677.2KSold out

Largest weight decreases

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

  1. SKESkeena Resources Ltd
    −3.75 pp3.7% → 0.0%History
  2. Discovery Silver Ord254677107
    −3.62 pp3.6% → 0.0%
  3. GGPSFGreatland Resources Limited
    −2.55 pp2.5% → 0.0%History
  4. Lundin Gold Inc Com550371108
    −1.91 pp1.9% → 0.0%
  5. Wesdome Gold Mines Ltd95083R100
    −1.55 pp1.5% → 0.0%

Metrics

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

Portfolio value
$37.4M
−$6.35M (−14.5%) vs. prior quarter
Positions
28
−20 vs. prior quarter
Top 10 concentration
74.4%
Top 10 as share of value
Turnover
0.5%
Q2 2026, one quarter
Average holding period
8.7 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 (Q2 2023), so positions held before then are understated.

13F filings by quarter

11 quarters, going back to Q2 2023. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $46.1M (Q3 2025)

Q2 2023: $36.6MQ3 2023: $33.5MQ2 2024: $34.4MQ3 2024: $36.3MQ4 2024: $33.3MQ1 2025: $34.7MQ2 2025: $37.9MQ3 2025: $46.1MQ4 2025: $43.9MQ1 2026: $43.8MQ2 2026: $37.4M
Q2 2023Q2 2026
13F filings of Corundum Trust Company, INC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 29, 202628$37.4MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q1 2026SEC
Q1 2026Apr 15, 202648$43.8MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q4 2025SEC
Q4 2025Jan 20, 202651$43.9MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q3 2025SEC
Q3 2025Oct 24, 2025127$46.1MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q2 2025SEC
Q2 2025Jul 28, 202550$37.9MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q1 2025SEC
Q1 2025Apr 24, 202550$34.7MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q4 2024SEC
Q4 2024Jan 17, 202549$33.3MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q3 2024SEC
Q3 2024Oct 22, 202452$36.3MMMMiShares Core S&P Small Cap ETFiShares Select Dividend ETFvs. Q2 2024SEC
Q2 2024Jul 24, 202455$34.4MMMMiShares Core S&P Small Cap ETFMSFT–SEC
Q3 2023Oct 23, 202337$33.5MMMMiShares Core S&P Small Cap ETFAAPLvs. Q2 2023SEC
Q2 2023Aug 3, 202339$36.6MMMMiShares Core S&P Small Cap ETFAAPL–SEC