CIK: 0001486083
Total reported value
$299.2M
Reporting period: 2026-03-31 · Number of holdings: 108
Corundum Group, Inc. disclosed 108 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $299.2M and a quarterly turnover rate of 12.8%.
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Corundum Group, Inc.'s disclosed holdings carry a Herfindahl concentration index of 0.045 — mathematically equivalent to about 22 equally-sized positions, well below its 108 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 1.98), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 26% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Trim MSFT
-18.3% -$2.8M
Trim g54950103
-33.1% -$2.3M
Trim 88579y101
+1.2% -$1.3M
Add 30231g102
+4.8% $1.0M
Add IWD
+1.6% $1.1M
Trim LMT
-26.1% -$948.7K
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | IWF | Ishares Russell 1000 Growth | ETF-Other | 12.17% | +0.08% | +12.21% | |
| 2 | IWD | Ishares Russell 1000 Value E | ETF-Other | 11.84% | +0.33% | +1.64% | |
| 3 | EFA | Ishares Msci Eafe ETF | ETF-Other | 5.27% | +0.26% | +4.46% | |
| 4 | ✓ | 3m Co | Stock-Other | 4.81% | -0.45% | +1.18% | |
| 5 | LMT | Lockheed Martin CORP | Stock-Industrials | 3.85% | -0.33% | -26.07% | |
| 6 | IWO | Ishares Russell 2000 Growth | ETF-Small Cap | 3.70% | — | +3.00% | |
| 7 | IWN | Ishares Russell 2000 Value E | ETF-Small Cap | 3.39% | +0.11% | -0.67% | |
| 8 | IWS | Ishares Russell Mid-cap Valu | ETF-Other | 3.35% | +0.14% | +1.36% | |
| 9 | IWP | Ishares Russell Mid-cap Grow | ETF-Other | 3.23% | +0.08% | +10.07% | |
| 10 | ✓ | State Street SPDR S&P 500 ETF Trust | ETF-Large Cap & Growth | 2.69% | -0.12% | +0.90% | |
| 11 | ✓ | Linde plc | Stock-Other | 2.63% | -0.76% | -33.13% | |
| 12 | SUSA | Ishares Esg Optimized Msci U | ETF-Other | 2.21% | -0.18% | -1.83% | |
| 13 | AAPL | Apple INC | Stock-Tech | 1.99% | -0.15% | +0.17% | |
| 14 | MSFT | Microsoft CORP | Stock-Tech | 1.54% | -0.94% | -18.33% | |
| 15 | ✓ | Vanguard Russell 1000 Value Et | Stock-Other | 1.48% | +0.23% | +16.91% | |
| 16 | ✓ | SPDR Gold Shares | Stock-Other | 1.35% | +0.19% | +8.10% | |
| 17 | IWB | Ishares Russell 1000 ETF | ETF-Other | 1.28% | +0.18% | +21.88% | |
| 18 | ✓ | Invesco Exchange Traded Fd T | Stock-Other | 1.13% | +0.20% | +19.43% | |
| 19 | IWM | Ishares Russell 2000 ETF | ETF-Small Cap | 1.13% | +0.24% | +25.96% | |
| 20 | ✓ | Exxon Mobil Corporation | Stock-Other | 1.05% | +0.34% | +4.84% | |
| 21 | ✓ | NVIDIA Corporation | Stock-Other | 0.99% | — | +2.93% | |
| 22 | ✓ | J P Morgan Chase And Co | Stock-Other | 0.96% | -0.09% | +0.75% | |
| 23 | ✓ | Alphabet Inc. | Stock-Other | 0.93% | -0.18% | -8.32% | |
| 24 | ✓ | Alphabet Inc. | Stock-Other | 0.86% | — | +2.64% | |
| 25 | ✓ | Spdr Portfolio S&p 500 ETF | ETF-Large Cap & Growth | 0.86% | -0.19% | -14.40% | |
| 26 | ✓ | First TR Global Tactical Commodity ETF | ETF-Commodities | 0.80% | +0.25% | +18.10% | |
| 27 | ✓ | Utilities Select Sector SPDR Fund - ETF | ETF-Other | 0.80% | +0.19% | +21.68% | |
| 28 | CAT | Caterpillar INC | Stock-Industrials | 0.80% | +0.19% | +5.70% | |
| 29 | VOO | Vanguard S&p 500 ETF | ETF-Large Cap & Growth | 0.79% | +0.19% | +39.36% | |
| 30 | IVW | Ishares S&p 500 Growth ETF | ETF-Large Cap & Growth | 0.77% | -0.10% | -3.21% | |
| 31 | ✓ | Broadcom Inc. | Stock-Other | 0.71% | — | +5.10% | |
| 32 | ✓ | Nushares ETF Tr Small Cap ETF | ETF-Small Cap | 0.68% | — | -1.71% | |
| 33 | JNJ | Johnson & Johnson | Stock-Healthcare | 0.64% | +0.13% | +6.04% | |
| 34 | IJH | Ishares Core S&p Midcap ETF | ETF-Other | 0.62% | — | -6.81% | |
| 35 | ✓ | Visa Inc. | Stock-Other | 0.60% | — | +33.74% | |
| 36 | AMZN | Amazon.com INC | Stock-Consumer Disc | 0.59% | -0.11% | -6.94% | |
| 37 | ✓ | AbbVie Inc. | Stock-Other | 0.59% | — | -3.08% | |
| 38 | ✓ | The Goldman Sachs Group, Inc. | Stock-Other | 0.53% | — | +10.54% | |
| 39 | ✓ | Cisco Systems, Inc. | Stock-Other | 0.52% | — | +9.65% | |
| 40 | BMY | Bristol-myers Squibb Co | Stock-Healthcare | 0.52% | +0.09% | +8.85% | |
| 41 | LLY | Eli Lilly & Co | Stock-Healthcare | 0.51% | — | +10.52% | |
| 42 | ECL | Ecolab INC | Stock-Materials | 0.50% | — | +11.21% | |
| 43 | ✓ | Costco Wholesale Corporation | Stock-Other | 0.49% | — | -7.33% | |
| 44 | USB | US Bancorp | Stock-Financials | 0.48% | — | +9.75% | |
| 45 | WMT | Walmart INC | Stock-Consumer Staples | 0.48% | +0.09% | +9.51% | |
| 46 | ✓ | Duke Energy Corporation | Stock-Other | 0.47% | +0.31% | +172.93% | |
| 47 | ✓ | Waste Management, Inc. | Stock-Other | 0.46% | — | +11.32% | |
| 48 | HD | Home Depot INC | Stock-Consumer Disc | 0.45% | — | +13.59% | |
| 49 | INTC | Intel CORP | Stock-Tech | 0.44% | +0.10% | +9.94% | |
| 50 | AMGN | Amgen INC | Stock-Healthcare | 0.43% | — | +10.92% |
Performance for Q3 2026
+3.5%
Performance Last 4 Quarters
+20.7%
Based on 65% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 108 | $299.2M | 13 | |
| 2025-12-31 | 113 | $298.0M | 27 | |
| 2025-09-30 | 103 | $243.4M | 20 | |
| 2025-06-30 | 103 | $226.2M | 0 | |
| 2025-03-31 | 98 | $208.5M | 100 | |
| 2024-12-31 | 100 | $267.8M | 0 | |
| 2024-09-30 | 100 | $219.2M | 0 | |
| 2024-06-30 | 101 | $256.0M | 0 | |
| 2024-03-31 | 98 | $207.3M | 0 | |
| 2023-12-31 | 100 | $199.4M | 0 | |
| 2023-09-30 | 102 | $176.0M | 0 | |
| 2023-06-30 | 116 | $200.5M | 0 | |
| 2023-03-31 | 100 | $211.4M | 0 | |
| 2022-12-31 | 101 | $177.1M | 0 | |
| 2022-09-30 | 107 | $159.0M | 0 | |
| 2022-06-30 | 97 | $148.0M | 0 | |
| 2022-03-31 | 99 | $107.6M | 0 | |
| 2021-12-31 | 104 | $153.6M | 0 | |
| 2021-09-30 | 94 | $134.9M | 0 | |
| 2021-06-30 | 103 | $152.5M | 91 | |
| 2021-03-31 | 91 | $128.0M | 9 | |
| 2020-12-31 | 93 | $120.0M | 18 | |
| 2020-09-30 | 87 | $103.2M | 23 | |
| 2020-06-30 | 62 | $83.4M | 21 | |
| 2020-03-31 | 60 | $70.3M | 32 | |
| 2019-12-31 | 73 | $95.2M | 11 | |
| 2019-09-30 | 66 | $86.3M | 4 | |
| 2019-06-30 | 70 | $87.0M | 9 | |
| 2019-03-31 | 71 | $87.4M | 38 | |
| 2018-12-31 | 77 | $108.9M | 46 | |
| 2018-06-30 | 55 | $81.1M | 20 | |
| 2018-03-31 | 55 | $92.5M | 6 | |
| 2017-12-31 | 51 | $92.7M | 12 | |
| 2017-09-30 | 50 | $94.9M | 72 | |
| 2017-06-30 | 35 | $45.1M | 73 | |
| 2017-03-31 | 30 | $79.3M | 16 | |
| 2016-12-31 | 28 | $68.0M | 20 | |
| 2016-09-30 | 27 | $61.8M | 22 | |
| 2016-06-30 | 27 | $65.0M | 68 | |
| 2016-03-31 | 23 | $38.0M | 18 | |
| 2015-12-31 | 20 | $33.4M | 18 | |
| 2015-09-30 | 13 | $28.2M | 19 | |
| 2015-06-30 | 13 | $28.4M | 7 | |
| 2015-03-31 | 13 | $29.6M | 22 | |
| 2014-12-31 | 15 | $24.8M | 19 | |
| 2014-09-30 | 13 | $21.1M | 10 | |
| 2014-06-30 | 13 | $21.3M | 10 | |
| 2014-03-31 | 11 | $20.6M | 5 | |
| 2013-12-31 | 12 | $21.3M | 21 | |
| 2013-09-30 | 9 | $17.9M | 10 | |
| 2013-06-30 | 8 | $16.2M | 0 |
Corundum Group, Inc.'s most significant position changes for 2026-03-31: Sold out: Ishares Core S&p 500 ETF (IVV); New buy: Verizon Communications Inc.; New buy: United Parcel Service-cl B (UPS); Sold out: Parker Hannifin CORP (PH); Sold out: Clorox Company (CLX).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | ✓ | Exxon Mobil Corporation | +0.3% | +4.84% | Add |
| 2 | IWD | Ishares Russell 1000 Value E | +0.3% | +1.64% | Add |
| 3 | ✓ | Duke Energy Corporation | +0.3% | +172.93% | Add |
| 4 | EFA | Ishares Msci Eafe ETF | +0.3% | +4.46% | Add |
| 5 | ✓ | First TR Global Tactical Commodity ETF | +0.3% | +18.10% | Add |
| 6 | IWM | Ishares Russell 2000 ETF | +0.2% | +25.96% | Add |
| 7 | ✓ | Vanguard Russell 1000 Value Et | +0.2% | +16.91% | Add |
| 8 | ✓ | Invesco Exchange Traded Fd T | +0.2% | +19.43% | Add |
| 9 | ✓ | SPDR Gold Shares | +0.2% | +8.10% | Add |
| 10 | VOO | Vanguard S&p 500 ETF | +0.2% | +39.36% | Add |
| 11 | ✓ | Utilities Select Sector SPDR Fund - ETF | +0.2% | +21.68% | Add |
| 12 | CAT | Caterpillar INC | +0.2% | +5.70% | Add |
| 13 | IWB | Ishares Russell 1000 ETF | +0.2% | +21.88% | Add |
| 14 | CVX | Chevron CORP | +0.2% | +20.37% | Add |
| 15 | IWS | Ishares Russell Mid-cap Valu | +0.1% | +1.36% | Add |
| 16 | JNJ | Johnson & Johnson | +0.1% | +6.04% | Add |
| 17 | IWN | Ishares Russell 2000 Value E | +0.1% | -0.67% | Trim |
| 18 | ✓ | FedEx Corporation | +0.1% | +24.39% | Add |
| 19 | INTC | Intel CORP | +0.1% | +9.94% | Add |
| 20 | ✓ | Mastercard Incorporated | +0.1% | +51.22% | Add |
| 21 | BMY | Bristol-myers Squibb Co | +0.1% | +8.85% | Add |
| 22 | WMT | Walmart INC | +0.1% | +9.51% | Add |
| 23 | IWF | Ishares Russell 1000 Growth | +0.1% | +12.21% | Add |
| 24 | IWP | Ishares Russell Mid-cap Grow | +0.1% | +10.07% | Add |
| 25 | ✓ | Merck & Co., Inc. | +0.1% | +9.85% | Add |
| 26 | ✓ | J P Morgan Chase And Co | -0.1% | +0.75% | Add |
| 27 | IVW | Ishares S&p 500 Growth ETF | -0.1% | -3.21% | Trim |
| 28 | AMZN | Amazon.com INC | -0.1% | -6.94% | Trim |
| 29 | ✓ | State Street SPDR S&P 500 ETF Trust | -0.1% | +0.90% | Add |
| 30 | AAPL | Apple INC | -0.2% | +0.17% | Add |
| 31 | ✓ | Alphabet Inc. | -0.2% | -8.32% | Trim |
| 32 | SUSA | Ishares Esg Optimized Msci U | -0.2% | -1.83% | Trim |
| 33 | ✓ | Spdr Portfolio S&p 500 ETF | -0.2% | -14.40% | Trim |
| 34 | LMT | Lockheed Martin CORP | -0.3% | -26.07% | Trim |
| 35 | ✓ | 3m Co | -0.5% | +1.18% | Add |
| 36 | ✓ | Linde plc | -0.8% | -33.13% | Trim |
| 37 | MSFT | Microsoft CORP | -0.9% | -18.33% | Trim |
| 38 | IVV | Ishares Core S&p 500 ETF | — | EXIT | Sold out |
| 39 | ✓ | Verizon Communications Inc. | — | NEW | New buy |
| 40 | UPS | United Parcel Service-cl B | — | NEW | New buy |
| 41 | PH | Parker Hannifin CORP | — | EXIT | Sold out |
| 42 | CLX | Clorox Company | — | EXIT | Sold out |
| 43 | ✓ | Corteva INC Reg Shs | — | EXIT | Sold out |
| 44 | ✓ | Trane Technologies PLC | — | EXIT | Sold out |
| 45 | ✓ | Dimensional ETF Trust | — | NEW | New buy |
| 46 | TJX | Tjx Companies INC | — | EXIT | Sold out |
| 47 | ✓ | Dimensional U S Equity ETF | — | NEW | New buy |
| 48 | ✓ | Meta Platforms, Inc. | — | EXIT | Sold out |
| 49 | ✓ | Ishares 0-3 Month Treasury Bon | — | NEW | New buy |
| 50 | ✓ | Intercontinental Exchange, Inc. | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-04-20 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-01-12 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-10-24 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-07-21 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-04-23 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-01-16 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-10-21 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-17 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-04-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-01-24 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-10-17 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-07-21 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-04-24 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-01-12 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-10-18 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-07-25 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-02 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-07 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-02 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-02 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-10 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-03 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-12 | Amendment | View on EDGAR |
| 2020-09-30 | 2020-11-10 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-07 | Amendment | View on EDGAR |
| 2020-06-30 | 2020-08-06 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-07 | Amendment | View on EDGAR |
| 2020-03-31 | 2020-05-06 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-01-28 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-01 | Amendment | View on EDGAR |
| 2019-09-30 | 2019-10-30 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-02 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-08 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-19 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-07 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-09 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-13 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-03 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-01 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-04-18 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-09 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-04 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-07-29 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-16 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-11 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-05 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-11 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-08 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-05 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-11-04 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-05 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-08 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-02-19 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-11-13 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-13 | 13F-HR | View on EDGAR |
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