StockDriftsStockDriftsTop 50 Mattern Capital Management LLC Holdings
| Stock | Company | % Port. | Shares | Value | Activity | Ownership | Avg. Cost | Date |
|---|---|---|---|---|---|---|---|---|
| AAPL | APPLE INC | 2.58% | 76.4K | $22.1M | -1.60%(-1.24K) | $87.34(+251.11%) | 2026-06-30 | |
| GWW | WW GRAINGER INC | 1.88% | 11.8K | $16.1M | -1.59%(-191) | $383.50(+240.23%) | 2026-06-30 | |
| MSFT | MICROSOFT CORP | 1.79% | 41.1K | $15.3M | -0.62%(-258) | $217.95(+130.67%) | 2026-06-30 | |
| UNH | UNITEDHEALTH GROUP INC | 1.71% | 35.2K | $14.6M | -9.14%(-3.54K) | $317.83(+28.32%) | 2026-06-30 | |
| COST | COSTCO WHOLESALE CORPORATION | 1.57% | 14.4K | $13.4M | -0.30%(-43) | $358.53(+165.79%) | 2026-06-30 | |
| AVGO | BROADCOM INC | 1.55% | 35.2K | $13.3M | -5.43%(-2.02K) | $127.59(+229.46%) | 2026-06-30 | |
| COR | CENCORA INC | 1.55% | 46.8K | $13.3M | +11.52%(+4.84K) | $117.18(+183.05%) | 2026-06-30 | |
| AFL | AFLAC INC | 1.51% | 110.3K | $12.9M | -0.29%(-316) | $55.30(+119.29%) | 2026-06-30 | |
| CSCO | CISCO SYS INC | 1.45% | 106.1K | $12.5M | +5.37%(+5.41K) | $50.41(+140.17%) | 2026-06-30 | |
| LIN | LINDE PLC | 1.44% | 23.8K | $12.3M | -1.37%(-329) | $242.66(+104.01%) | 2026-06-30 |
| Performance Metric | 3-Year Annualized | 3-Year Cumulative | 5-Year Annualized | 5-Year Cumulative |
|---|---|---|---|---|
| Top 20 Holdings Weighted | +6.42% | +20.54% | +3.27% | +17.44% |
| Top 20 Holdings Unweighted | +5.81% | +18.47% | +2.68% | +14.11% |
Mattern Capital Management LLC reports $856.75M in US-listed equity holdings across 166 positions in its most recent 13F filing. Its largest disclosed positions are AAPL (2.6%), GWW (1.9%) and MSFT (1.8%). The top 20 holdings account for 30.8% of reported assets. Its disclosed equity book has returned +20.54% on a three-year cumulative basis. Figures reflect the Q2 2026 filing.
Portfolio changes
Every reported change this quarter, grouped by direction. The signal is in the rotation, not any single trade.
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Holdings on this page are parsed from Mattern Capital Management LLC’s Form 13F filings with the U.S. Securities and Exchange Commission (CIK 1803227). View Mattern Capital Management LLC’s 13F filings on SEC