Corundum Group, Inc.
- SEC CIK
- 0001486083
- Latest filing
- Aug 7, 2026
The latest 13F from Corundum Group, Inc. covers Q2 2026 (filed Aug 7, 2026): 112 long positions worth $337.1M. The top 10 holdings make up 54.0% of the portfolio, and the largest is iShares Russell 1000 Growth ETF at 12.6%. 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.
- New
- 12
- Est. +$7.05M
- Added
- 59
- Est. +$3.50M
- Reduced
- 29
- Est. −$4.66M
- Sold out
- 8
- Est. −$5.44M
Top 5 holdings
Share of this quarter's portfolio value
- iShares Russell 1000 Growth ETF46428761412.6%$42.4M
- iShares Russell 1000 Value ETF46428759812.0%$40.5M
- iShares MSCI Eafe ETF4642874655.1%$17.1M
- MMM3M Co
- iShares Russell 2000 Growth ETF4642876484.1%$13.7M
Biggest buys
New and added positions, by estimated amount bought
Largest weight increases
New and added positions, by percentage points of the portfolio gained
Biggest sells
Reduced and sold-out positions, by estimated amount sold
Largest weight decreases
Reduced and sold-out positions, by percentage points of the portfolio lost
Metrics
13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.
- Portfolio value
- $337.1M
- +$37.9M (+12.7%) vs. prior quarter
- Positions
- 112
- +4 vs. prior quarter
- Top 10 concentration
- 54.0%
- Top 10 as share of value
- Turnover
- 3.2%
- Q2 2026, one quarter
- Average holding period
- 18.4 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 $337.1M (Q2 2026)
| Quarter | Filed | Positions | Value | Top 3 holdings | Changes | Filing |
|---|---|---|---|---|---|---|
| Q2 2026 | Aug 7, 2026 | 112 | $337.1M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFiShares MSCI Eafe ETF | vs. Q1 2026 | SEC |
| Q1 2026 | Apr 20, 2026 | 108 | $299.2M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFiShares MSCI Eafe ETF | vs. Q4 2025 | SEC |
| Q4 2025 | Jan 12, 2026 | 113 | $298.0M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q3 2025 | SEC |
| Q3 2025 | Oct 24, 2025 | 103 | $243.4M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q2 2025 | SEC |
| Q2 2025 | Jul 21, 2025 | 103 | $226.2M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q1 2025 | SEC |
| Q1 2025 | Apr 23, 2025 | 98 | $208.5M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q4 2024 | SEC |
| Q4 2024 | Jan 16, 2025 | 100 | $267.8M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFSPY | vs. Q3 2024 | SEC |
| Q3 2024 | Oct 21, 2024 | 100 | $219.2M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q2 2024 | SEC |
| Q2 2024 | Jul 17, 2024 | 101 | $256.0M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFSPY | vs. Q1 2024 | SEC |
| Q1 2024 | Apr 15, 2024 | 98 | $207.3M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q4 2023 | SEC |
| Q4 2023 | Jan 24, 2024 | 100 | $199.4M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q3 2023 | SEC |
| Q3 2023 | Oct 17, 2023 | 102 | $176.0M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q2 2023 | SEC |
| Q2 2023 | Jul 21, 2023 | 116 | $200.5M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q1 2023 | SEC |
| Q1 2023 | Apr 24, 2023 | 100 | $211.4M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFiShares MSCI Eafe ETF | vs. Q4 2022 | SEC |
| Q4 2022 | Jan 12, 2023 | 101 | $177.1M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q3 2022 | SEC |
| Q3 2022 | Oct 18, 2022 | 107 | $159.0M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q2 2022 | SEC |
| Q2 2022 | Jul 25, 2022 | 97 | $148.0M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q1 2022 | SEC |
| Q1 2022 | May 2, 2022 | 99 | $107.6M | MMMSPYAAPL | vs. Q4 2021 | SEC |
| Q4 2021 | Feb 7, 2022 | 104 | $153.6M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q3 2021 | SEC |
| Q3 2021 | Nov 2, 2021 | 94 | $134.9M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | vs. Q2 2021 | SEC |
| Q2 2021 | Aug 2, 2021 | 103 | $152.5M | MMMiShares Russell 1000 Growth ETFiShares Russell 1000 Value ETF | vs. Q1 2021 | SEC |
| Q1 2021 | May 10, 2021 | 91 | $128.0M | iShares Russell 1000 Growth ETFiShares Russell 1000 Value ETFMMM | – | SEC |