Corundum Group, Inc. reported 46 positions worth $74.23M for the quarter ended Sep 30, 2026, up 17.6% on the prior quarter. It opened 4 new positions, added to 31, trimmed 11 and exited 2. Its largest holding is Apple Inc. at 14% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| MSFT Microsoft Corp | +4,861 | +38.9% | $2.49M | 12% |
| AAPL Apple Inc. | +6,688 | +27.4% | $2.23M | 13.97% |
| LLY ELI LILLY & Co | +1,120 | +66.6% | $1.30M | 4.37% |
| TMO Thermo Fisher Scientific Inc. | +812 | – | $548.14K | 0.738% |
| UNP Union Pacific Corp | +1,713 | – | $466.16K | 0.628% |
| C Citigroup Inc | +3,402 | – | $440.49K | 0.593% |
| UGI Ugi Corp | +9,773 | – | $348.60K | 0.47% |
| AMZN Amazon Com Inc | +1,323 | +15.4% | $329.63K | 3.33% |
| BRK-B Berkshire Hathaway Inc | +636 | +24.6% | $316.70K | 2.16% |
| BA Boeing Co | +1,120 | +24.3% | $208.38K | 1.44% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| AJG Arthur J. Gallagher & Co. | -1,079 | -100.0% | $247.71K | Exited |
| FDXF FedEx Freight Holding Company, Inc. | -1,340 | -100.0% | $202.34K | Exited |
| MU Micron Technology Inc | -138 | -13.3% | $146.99K | 1.29% |
| PANW Palo Alto Networks Inc | -274 | -27.0% | $108.86K | 0.397% |
| PGR Progressive Corp | -219 | -17.3% | $45.40K | 0.292% |
| DHR Danaher Corp | -102 | -6.2% | $22.60K | 0.459% |
| TSM Taiwan Semiconductor Manufacturing Co Ltd | -31 | -2.6% | $14.14K | 0.702% |
| GE General Electric Co | -41 | -2.6% | $12.80K | 0.634% |
| SCHW Schwab Charles Corp | -106 | -4.5% | $10.36K | 0.297% |
| CTAS Cintas Corp | -52 | -3.7% | $10.14K | 0.354% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | AAPL Apple Inc. | Technology | 31.1K | $10.37M | 13.97% | +6,688 | +27.4% | Added | 0% |
| 2 | LMT Lockheed Martin Corp | Industrials | 19.1K | $9.70M | 13.07% | +12 | +0.1% | Added | 0.01% |
| 3 | MSFT Microsoft Corp | Technology | 17.4K | $8.91M | 12% | +4,861 | +38.9% | Added | 0% |
| 4 | INTC Intel Corp | Technology | 31.0K | $3.73M | 5.03% | +1,188 | +4.0% | Added | 0% |
| 5 | LLY ELI LILLY & Co | Healthcare | 2,801 | $3.24M | 4.37% | +1,120 | +66.6% | Added | 0% |
| 6 | CAT Caterpillar Inc | Industrials | 3,368 | $2.73M | 3.68% | +31 | +0.9% | Added | 0% |
| 7 | AMZN Amazon Com Inc | Consumer Discretionary | 9,924 | $2.47M | 3.33% | +1,323 | +15.4% | Added | 0% |
| 8 | JNJ Johnson & Johnson | Healthcare | 7,996 | $2.12M | 2.85% | +241 | +3.1% | Added | 0% |
| 9 | USB Us Bancorp De | Financial Services | 29.0K | $1.68M | 2.26% | +1,024 | +3.7% | Added | 0% |
| 10 | BMY Bristol Myers Squibb Co | Healthcare | 26.6K | $1.66M | 2.24% | +832 | +3.2% | Added | 0% |
| 11 | BRK-B Berkshire Hathaway Inc | Financial Services | 3,225 | $1.61M | 2.16% | +636 | +24.6% | Added | 0% |
| 12 | AMGN Amgen Inc | Healthcare | 3,808 | $1.61M | 2.16% | +130 | +3.5% | Added | 0% |
| 13 | ECL Ecolab Inc. | Industrials | 5,815 | $1.60M | 2.15% | +169 | +3.0% | Added | 0% |
| 14 | BAC Bank Of America Corp | Financial Services | 27.1K | $1.47M | 1.99% | +2,175 | +8.7% | Added | 0% |
| 15 | WMT Walmart Inc. | Consumer Staples | 12.4K | $1.29M | 1.74% | +585 | +4.9% | Added | 0% |
Tip. Select a row to see that position’s full history at Corundum.
As of its Q3 2026 13F filing, Corundum Group, Inc.’s five largest positions were Apple Inc. (AAPL) at 14.0%, Lockheed Martin Corp (LMT) at 13.1%, Microsoft Corp (MSFT) at 12.0%, Intel Corp (INTC) at 5.0%, ELI LILLY & Co (LLY) at 4.4% of the reported portfolio.
Corundum Group, Inc. reported a 13F portfolio worth $74.23M across 46 positions for Q3 2026. That is up 17.6% from the previous quarter.
Its largest purchases by value were Microsoft Corp ($2.49M), Apple Inc. ($2.23M), ELI LILLY & Co ($1.30M). It opened 4 new positions.
Its largest sales by value were Arthur J. Gallagher & Co. ($247.71K), FedEx Freight Holding Company, Inc. ($202.34K), Micron Technology Inc ($146.99K). It exited 2 positions entirely.
From the Form 13F-HR reports Corundum Group, Inc. files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.