Mattern Capital Management, LLC reported 129 positions worth $786.63M for the quarter ended Sep 30, 2026, down 0.2% on the prior quarter. It opened 6 new positions, added to 50, trimmed 59 and exited 3. Its largest holding is Apple Inc. at 3% 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 |
|---|---|---|---|---|
| TJX Tjx Companies Inc | +25.4K | – | $3.36M | 0.428% |
| GE General Electric Co | +9,744 | – | $3.04M | 0.387% |
| ETN Eaton Corp plc | +7,053 | – | $3.03M | 0.385% |
| ZTS Zoetis Inc. | +24.1K | +24.4% | $1.69M | 1.09% |
| LHX L3Harris Technologies, Inc. | +4,396 | +12.0% | $1.04M | 1.24% |
| MCD Mcdonalds Corp | +4,400 | +13.8% | $1.02M | 1.07% |
| WDAY Workday, Inc. | +5,162 | +155.0% | $983.15K | 0.206% |
| INTU Intuit Inc. | +3,393 | +13.1% | $935.48K | 1.02% |
| WMT Walmart Inc. | +8,747 | +9.4% | $908.99K | 1.35% |
| PEP Pepsico Inc | +7,044 | +11.6% | $892.62K | 1.09% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| NKE NIKE, Inc. | -193.3K | -100.0% | $7.94M | Exited |
| AAPL Apple Inc. | -5,228 | -6.8% | $1.74M | 3.01% |
| MSFT Microsoft Corp | -2,682 | -6.5% | $1.38M | 2.5% |
| PSX Phillips 66 | -4,587 | -12.4% | $1.17M | 1.05% |
| BDX Becton Dickinson & Co | -5,535 | -9.9% | $990.77K | 1.14% |
| COR Cencora, Inc. | -3,118 | -6.7% | $936.18K | 1.67% |
| FDS Factset Research Systems Inc | -3,071 | -6.6% | $829.02K | 1.5% |
| CSCO Cisco Systems, Inc. | -7,461 | -7.0% | $803.03K | 1.35% |
| GWW W.W. Grainger, Inc. | -608 | -5.1% | $757.42K | 1.78% |
| LLY ELI LILLY & Co | -648 | -6.4% | $749.79K | 1.4% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | AAPL Apple Inc. | Technology | 71.1K | $23.69M | 3.01% | -5,228 | -6.8% | Reduced | 0% |
| 2 | MSFT Microsoft Corp | Technology | 38.4K | $19.70M | 2.5% | -2,682 | -6.5% | Reduced | 0% |
| 3 | GWW W.W. Grainger, Inc. | Industrials | 11.2K | $13.96M | 1.78% | -608 | -5.1% | Reduced | 0.02% |
| 4 | COR Cencora, Inc. | Healthcare | 43.7K | $13.12M | 1.67% | -3,118 | -6.7% | Reduced | 0.02% |
| 5 | COST Costco Wholesale Corp | Consumer Staples | 14.4K | $13.07M | 1.66% | -16 | -0.1% | Reduced | 0% |
| 6 | AVGO Broadcom Inc. | Technology | 35.7K | $12.55M | 1.6% | +535 | +1.5% | Added | 0% |
| 7 | UNH Unitedhealth Group Inc | Healthcare | 33.9K | $12.45M | 1.58% | -1,321 | -3.7% | Reduced | 0% |
| 8 | ADP Automatic Data Processing Inc | Technology | 47.6K | $12.28M | 1.56% | -2,610 | -5.2% | Reduced | 0.01% |
| 9 | AFL Aflac Inc | Financial Services | 107.7K | $12.04M | 1.53% | -2,565 | -2.3% | Reduced | 0.02% |
| 10 | FDS Factset Research Systems Inc | Financial Services | 43.8K | $11.81M | 1.5% | -3,071 | -6.6% | Reduced | 0.12% |
| 11 | LIN Linde Plc | Basic Materials | 24.1K | $11.43M | 1.45% | +336 | +1.4% | Added | 0.01% |
| 12 | CB Chubb Ltd | Financial Services | 34.8K | $11.31M | 1.44% | -1,203 | -3.3% | Reduced | 0.01% |
| 13 | AMGN Amgen Inc | Healthcare | 26.6K | $11.23M | 1.43% | -1,372 | -4.9% | Reduced | 0% |
| 14 | BLK BlackRock, Inc. | Financial Services | 10.5K | $11.08M | 1.41% | -149 | -1.4% | Reduced | 0.01% |
| 15 | LLY ELI LILLY & Co | Healthcare | 9,540 | $11.04M | 1.4% | -648 | -6.4% | Reduced | 0% |
Tip. Select a row to see that position’s full history at Mattern Capital Management.
As of its Q3 2026 13F filing, Mattern Capital Management, LLC’s five largest positions were Apple Inc. (AAPL) at 3.0%, Microsoft Corp (MSFT) at 2.5%, W.W. Grainger, Inc. (GWW) at 1.8%, Cencora, Inc. (COR) at 1.7%, Costco Wholesale Corp (COST) at 1.7% of the reported portfolio.
Mattern Capital Management, LLC reported a 13F portfolio worth $786.63M across 129 positions for Q3 2026. That is down 0.2% from the previous quarter.
Its largest purchases by value were Tjx Companies Inc ($3.36M), General Electric Co ($3.04M), Eaton Corp plc ($3.03M). It opened 6 new positions.
Its largest sales by value were NIKE, Inc. ($7.94M), Apple Inc. ($1.74M), Microsoft Corp ($1.38M). It exited 3 positions entirely.
From the Form 13F-HR reports Mattern Capital Management, LLC 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.