Mattern Capital Management, LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed July 24, 2026), Mattern Capital Management, LLC reported 166 stock positions worth $856.7 million. Its top holding was Apple (AAPL) at 2.6% of the portfolio, followed by WW Grainger (GWW, 1.9%) and Microsoft (MSFT, 1.8%). Compared with Q1 2026, it opened 3 new positions, sold out of 7, added to 92 and reduced 44. The biggest buy was JPMorgan Chase (JPM, shares +510%) and the biggest sale Phillips 66 (PSX, shares −58%).
- Most Recent 13F
- Q2 2026
- Location
- LAKEWOOD, CO
- CIK
- 0001803227
- Portfolio Value
- $856.7M (Q2 2026)
- SEC Filing
- 0001725547-26-000252 ↗ filed Jul 24, 2026
Holdings Value
Holdings 166 stocks · $856.7M
| AAPL Apple Inc. | 2.58% | 76,362 | $22.1M | Reduce -1.6% |
| GWW WW Grainger Inc. | 1.88% | 11,817 | $16.1M | Reduce -1.6% |
| MSFT Microsoft Corp. | 1.79% | 41,086 | $15.3M | Reduce -0.6% |
| UNH Unitedhealth Group Inc. | 1.71% | 35,240 | $14.6M | Reduce -9.1% |
| COST Costco Wholesale Corp. | 1.57% | 14,372 | $13.4M | Reduce -0.3% |
| AVGO Broadcom Inc. | 1.55% | 35,199 | $13.3M | Reduce -5.4% |
| COR Cencora Inc. | 1.55% | 46,831 | $13.3M | Add +11.5% |
| AFL Aflac Inc. | 1.51% | 110,309 | $12.9M | Reduce -0.3% |
| CSCO Cisco Systems Inc. | 1.45% | 106,058 | $12.5M | Add +5.4% |
| LIN Linde PLC | 1.44% | 23,750 | $12.3M | Reduce -1.4% |
| CB Chubb Ltd. | 1.43% | 35,965 | $12.3M | Reduce -0.4% |
| LLY Eli Lilly & Co. | 1.43% | 10,188 | $12.2M | Add +6.2% |
| WEC WEC Energy Group Inc. | 1.42% | 103,889 | $12.1M | Reduce -5.5% |
| LOW Lowe's Cos Inc. | 1.41% | 54,910 | $12.1M | Add +5.6% |
| GD General Dynamics Corp. | 1.39% | 33,512 | $11.9M | Add +1.6% |
| TXN Texas Instruments Inc. | 1.38% | 39,548 | $11.8M | Reduce -2.2% |
| NEE Nextera Energy Inc. | 1.35% | 131,600 | $11.6M | Reduce -1.8% |
| CMS CMS Energy Corp. | 1.35% | 150,896 | $11.5M | Reduce -5.5% |
| ADP Automatic Data Processing | 1.31% | 50,215 | $11.2M | Add +1.7% |
| AWK American Water Works Co. Inc. | 1.30% | 84,940 | $11.2M | Reduce -3.0% |
| TT Trane Technologies PLC | 1.30% | 22,695 | $11.1M | Reduce -4.0% |
| APH Amphenol Corp. Class A | 1.29% | 62,586 | $11.0M | Add +18.4% |
| BRO Brown & Brown Inc. | 1.27% | 169,855 | $10.9M | Add +19.0% |
| SHW The Sherwin-Williams Co. | 1.26% | 31,373 | $10.8M | Add +7.2% |
| FDS Factset Research Systems Inc. | 1.26% | 46,828 | $10.8M | Add +0.3% |
| LHX L3HARRIS Technologies Inc. | 1.24% | 36,645 | $10.6M | Add +5.5% |
| HD Home Depot Inc. | 1.24% | 30,013 | $10.6M | Add +10.1% |
| WMT Walmart Inc. | 1.24% | 93,445 | $10.6M | Add +5.9% |
| PAYX Paychex Inc. | 1.23% | 107,571 | $10.6M | Add +0.3% |
| ADI Analog Devices Inc. | 1.22% | 26,398 | $10.5M | Reduce -0.5% |
| JPM JPMorgan Chase & Co. | 1.21% | 31,711 | $10.4M | Add +510.4% |
| ECL Ecolab Inc. | 1.20% | 36,966 | $10.3M | Add +4.1% |
| MSI Motorola Solutions Inc. | 1.20% | 24,690 | $10.3M | Add +0.6% |
| ATO Atmos Energy Corp. | 1.19% | 59,371 | $10.2M | Reduce -0.6% |
| BLK BlackRock Inc. | 1.19% | 10,621 | $10.2M | Add +2.3% |
| AMGN Amgen Inc. | 1.18% | 28,008 | $10.1M | Add +17.2% |
| JNJ Johnson & Johnson | 1.18% | 39,870 | $10.1M | Add +12.8% |
| V Visa Inc. Class A | 1.18% | 29,508 | $10.1M | Add +9.4% |
| PH Parker Hannifin Corp. | 1.16% | 10,138 | $9.9M | Add +11.6% |
| ABT Abbott Laboratories | 1.15% | 109,046 | $9.9M | Add +3.0% |
| ITW Illinois Tool Works | 1.15% | 36,515 | $9.9M | Add +3.0% |
| XYL Xylem Inc. | 1.15% | 83,398 | $9.9M | Add +10.2% |
| WM Waste Management Inc. | 1.15% | 44,162 | $9.8M | Add +4.3% |
| SPGI S&P Global Inc. | 1.15% | 24,125 | $9.8M | Add +10.5% |
| ROP Roper Technologies Inc. | 1.15% | 29,027 | $9.8M | Reduce -0.1% |
| NJR New Jersey Resources Corp. | 1.14% | 174,671 | $9.8M | Reduce -3.0% |
| SYK Stryker Corp. | 1.14% | 31,079 | $9.8M | Add +16.6% |
| PLD Prologis Inc. | 1.13% | 71,369 | $9.7M | Reduce -1.5% |
| CL Colgate-Palmolive Co. | 1.12% | 104,479 | $9.6M | Add +0.2% |
| CTAS Cintas Corp. | 1.11% | 55,902 | $9.5M | Add +8.1% |
| BR Broadridge Financial Solutio | 1.06% | 66,397 | $9.1M | Add +6.0% |
| CHD Church & Dwight Co. Inc. | 1.05% | 92,883 | $9.0M | Add +1.6% |
| TSCO Tractor Supply Company | 1.05% | 284,547 | $9.0M | Add +43.9% |
| PG The Procter & Gamble Co. | 1.05% | 61,179 | $9.0M | Add +5.6% |
| MDT Medtronic PLC | 1.04% | 114,041 | $8.9M | Add +13.7% |
| WRB WR Berkley Corp. filed as BERKLEY W R CORP | 1.04% | 126,077 | $8.9M | Add +11.7% |
| MA Mastercard Inc. Class A | 1.02% | 16,976 | $8.7M | Add +6.4% |
| MCD McDonald's Corp. | 1.01% | 31,907 | $8.6M | Add +6.9% |
| CEG Constellation Energy | 1.00% | 34,378 | $8.5M | Reduce -7.3% |
| BDX Becton Dickinson and Co. | 0.98% | 55,723 | $8.4M | Add +33.7% |
| JKHY Jack Henry & Associates Inc. filed as HENRY JACK & ASSOC INC | 0.98% | 61,106 | $8.4M | Add +17.3% |
| MDLZ Mondelez International Inc. Class A | 0.96% | 142,795 | $8.3M | Add +1.4% |
| PEP Pepsico Inc. | 0.96% | 60,531 | $8.2M | Add +2.6% |
| NKE Nike Inc. Class B | 0.93% | 193,333 | $7.9M | Add +43.1% |
| ICE Intercontinental Exchange Inc. | 0.88% | 61,537 | $7.6M | Add +5.5% |
| VOO Vanguard S&P 500 ETF | 0.84% | 10,470 | $7.2M | No change |
| ZTS Zoetis Inc. | 0.83% | 99,018 | $7.1M | Add +43.0% |
| ACN Accenture PLC Class A | 0.79% | 54,367 | $6.8M | Add +13.2% |
| INTU Intuit Inc. | 0.79% | 25,820 | $6.7M | Add +11.5% |
| PSX Phillips 66 | 0.73% | 36,899 | $6.2M | Reduce -58.4% |
| AVIG Avantis Core Fixed Income | 0.70% | 145,608 | $6.0M | Reduce -0.3% |
| JBND JPMorgan Active Bond ETF | 0.67% | 107,955 | $5.8M | Reduce -0.4% |
| AVLV Avantis US Large Cap Value | 0.48% | 45,054 | $4.1M | Add +45.7% |
| QQQ Invesco QQQ Trust Series 1 | 0.47% | 5,431 | $4.0M | No change |
| USFR Wisdomtree Floating Rate Tre | 0.43% | 72,483 | $3.6M | Add +5.5% |
| AMZN Amazon.com Inc. | 0.42% | 15,081 | $3.6M | Add +1.7% |
| DIA SS SPDR Dow Jones Indus Avg filed as STATE STR SPDR DOW JONES IND | 0.38% | 6,297 | $3.3M | No change |
| DUHP Dimensional US High Profi Et | 0.37% | 76,310 | $3.2M | Add +53.9% |
| VTEB Vanguard Tax-Exempt Bond ETF | 0.35% | 59,478 | $3.0M | Add +30.1% |
| TFLO iShares Treasury Floating Ra | 0.33% | 55,463 | $2.8M | Add +5.8% |
| VNLA Janus Henderson Short Durati | 0.32% | 55,881 | $2.7M | Reduce -3.3% |
| GOOG Alphabet Inc. Class C | 0.31% | 7,524 | $2.7M | Add +4.1% |
| IWD iShares Russell 1000 Value E | 0.29% | 10,246 | $2.5M | No change |
| TSM Taiwan Semiconductor-SP ADR | 0.28% | 5,057 | $2.4M | Reduce -9.2% |
| ASML ASML Holding NV-NY Reg SHS filed as ASML HLDG NV | 0.28% | 1,194 | $2.4M | Add +2.2% |
| NFLX Netflix Inc. | 0.25% | 29,936 | $2.1M | Add +7.8% |
| VRTX Vertex Pharmaceuticals Inc. | 0.25% | 4,232 | $2.1M | Add +9.2% |
| NVO Novo-Nordisk A/S-Spons ADR | 0.23% | 41,849 | $2.0M | Reduce -9.7% |
| CBSH Commerce Bancshares Inc. | 0.23% | 34,107 | $2.0M | Reduce -79.0% |
| FRT Federal Realty Invs Trust | 0.23% | 15,624 | $1.9M | Reduce -71.3% |
| CRM Salesforce Inc. | 0.21% | 11,649 | $1.8M | Add +6.6% |
| SPY SS SPDR S&P 500 ETF Trust-US | 0.20% | 2,285 | $1.7M | Add +2.4% |
| BRK.B Berkshire Hathaway Inc. Class B | 0.19% | 3,325 | $1.7M | Add +11.1% |
| NVDA Nvidia Corp. | 0.19% | 8,306 | $1.7M | Add +7.2% |
| TYL Tyler Technologies Inc. | 0.19% | 5,547 | $1.6M | Add +11.8% |
| RSG Republic Services Inc. | 0.19% | 7,530 | $1.6M | Add +34.6% |
| AON Aon PLC Class A | 0.19% | 4,798 | $1.6M | Add +16.6% |
| COP Conocophillips | 0.18% | 15,217 | $1.6M | Reduce -11.5% |
| MSCI MSCI Inc. | 0.18% | 2,819 | $1.6M | Add +2.0% |
| IWF iShares Russell 1000 Growth | 0.18% | 12,501 | $1.6M | Reduce -0.4% |
Portfolio Sells Q1 2026 → Q2 2026
| PSX Phillips 66 | Reduce -58.4% | 0.73% | −1.21 |
| PPG PPG Industries Inc. | Reduce -93.6% | 0.07% | −0.90 |
| MKC McCormick & Co.-Non VTG SHRS | Sold out | 0.00% | −0.75 |
| CBSH Commerce Bancshares Inc. | Reduce -79.0% | 0.23% | −0.73 |
| O Realty Income Corp. | Reduce -78.2% | 0.14% | −0.53 |
| FRT Federal Realty Invs Trust | Reduce -71.3% | 0.23% | −0.47 |
| CEG Constellation Energy | Reduce -7.3% | 1.00% | −0.24 |
| COST Costco Wholesale Corp. | Reduce -0.3% | 1.57% | −0.15 |
| NEE Nextera Energy Inc. | Reduce -1.8% | 1.35% | −0.14 |
| CMS CMS Energy Corp. | Reduce -5.5% | 1.35% | −0.14 |
| ATO Atmos Energy Corp. | Reduce -0.6% | 1.19% | −0.13 |
| AWK American Water Works Co. Inc. | Reduce -3.0% | 1.30% | −0.12 |
| WEC WEC Energy Group Inc. | Reduce -5.5% | 1.42% | −0.11 |
| CVX Chevron Corp. | Reduce -16.7% | 0.17% | −0.09 |
| COP Conocophillips | Reduce -11.5% | 0.18% | −0.09 |
| ROP Roper Technologies Inc. | Reduce -0.1% | 1.15% | −0.08 |
| HON Honeywell International Inc. | Sold out | 0.00% | −0.05 |
| MSFT Microsoft Corp. | Reduce -0.6% | 1.79% | −0.04 |
| IEMG iShares Core MSCI Emerging | Reduce -59.6% | 0.04% | −0.04 |
| NJR New Jersey Resources Corp. | Reduce -3.0% | 1.14% | −0.04 |
| SHY iShares 1-3 Year Treasury Bo | Sold out | 0.00% | −0.03 |
| VB Vanguard Most SM-Cap ETF-Usd | Sold out | 0.00% | −0.03 |
| DGRO iShares Core Dividend Growth | Sold out | 0.00% | −0.03 |
| EMR Emerson Electric Co. | Sold out | 0.00% | −0.02 |
| TGT Target Corp. | Sold out | 0.00% | −0.02 |
| JBND JPMorgan Active Bond ETF | Reduce -0.4% | 0.67% | −0.02 |
| AVIG Avantis Core Fixed Income | Reduce -0.3% | 0.70% | −0.02 |
| VNLA Janus Henderson Short Durati | Reduce -3.3% | 0.32% | −0.02 |
| PLD Prologis Inc. | Reduce -1.5% | 1.13% | −0.02 |
| RTX RTX Corp. | Reduce -0.1% | 0.07% | −0.00 |
| SUB iShares Short-Term National | Reduce -0.0% | 0.03% | −0.00 |
| INMU iShares Intermediate Muni Inc. | Reduce -0.6% | 0.04% | −0.00 |
| IVW iShares S&P 500 Growth ETF | Reduce -7.3% | 0.03% | +0.00 |
| SBUX Starbucks Corp. | Reduce -4.9% | 0.05% | +0.00 |
| QUAL iShares MSCI USA Quality Fac | Reduce -5.3% | 0.11% | +0.01 |
| LIN Linde PLC | Reduce -1.4% | 1.44% | +0.01 |
| VLUE iShares MSCI USA Value Facto | Reduce -9.7% | 0.05% | +0.01 |
| VTI VG Morningstar TS MKT ETF-US | Reduce -4.6% | 0.18% | +0.01 |
| WSO Watsco Inc. | Reduce -0.6% | 0.17% | +0.02 |
| CB Chubb Ltd. | Reduce -0.4% | 1.43% | +0.02 |
| IWF iShares Russell 1000 Growth | Reduce -0.4% | 0.18% | +0.02 |
| NVO Novo-Nordisk A/S-Spons ADR | Reduce -9.7% | 0.23% | +0.03 |
| AFL Aflac Inc. | Reduce -0.3% | 1.51% | +0.06 |
| TSM Taiwan Semiconductor-SP ADR | Reduce -9.2% | 0.28% | +0.06 |
| TT Trane Technologies PLC | Reduce -4.0% | 1.30% | +0.12 |
| AVGO Broadcom Inc. | Reduce -5.4% | 1.55% | +0.17 |
| ADI Analog Devices Inc. | Reduce -0.5% | 1.22% | +0.21 |
| AAPL Apple Inc. | Reduce -1.6% | 2.58% | +0.22 |
| GWW WW Grainger Inc. | Reduce -1.6% | 1.88% | +0.31 |
| TXN Texas Instruments Inc. | Reduce -2.2% | 1.38% | +0.44 |
Portfolio Buys Q1 2026 → Q2 2026
| JPM JPMorgan Chase & Co. | Add +510.4% | 1.21% | +1.03 |
| CSCO Cisco Systems Inc. | Add +5.4% | 1.45% | +0.52 |
| APH Amphenol Corp. Class A | Add +18.4% | 1.29% | +0.49 |
| LLY Eli Lilly & Co. | Add +6.2% | 1.43% | +0.37 |
| V Visa Inc. Class A | Add +9.4% | 1.18% | +0.21 |
| BDX Becton Dickinson and Co. | Add +33.7% | 0.98% | +0.20 |
| PH Parker Hannifin Corp. | Add +11.6% | 1.16% | +0.18 |
| AVLV Avantis US Large Cap Value | Add +45.7% | 0.48% | +0.18 |
| AMGN Amgen Inc. | Add +17.2% | 1.18% | +0.18 |
| HD Home Depot Inc. | Add +10.1% | 1.24% | +0.16 |
| BRO Brown & Brown Inc. | Add +19.0% | 1.27% | +0.16 |
| DUHP Dimensional US High Profi Et | Add +53.9% | 0.37% | +0.15 |
| JNJ Johnson & Johnson | Add +12.8% | 1.18% | +0.15 |
| WRB WR Berkley Corp. | Add +11.7% | 1.04% | +0.14 |
| SHW The Sherwin-Williams Co. | Add +7.2% | 1.26% | +0.14 |
| ADP Automatic Data Processing | Add +1.7% | 1.31% | +0.11 |
| SYK Stryker Corp. | Add +16.6% | 1.14% | +0.09 |
| ASML ASML Holding NV-NY Reg SHS | Add +2.2% | 0.28% | +0.09 |
| VTEB Vanguard Tax-Exempt Bond ETF | Add +30.1% | 0.35% | +0.08 |
| NKE Nike Inc. Class B | Add +43.1% | 0.93% | +0.07 |
| ECL Ecolab Inc. | Add +4.1% | 1.20% | +0.07 |
| XYL Xylem Inc. | Add +10.2% | 1.15% | +0.07 |
| JTEK JPMorgan US Tech Leaders | Add +42.9% | 0.13% | +0.07 |
| MA Mastercard Inc. Class A | Add +6.4% | 1.02% | +0.06 |
| GOOG Alphabet Inc. Class C | Add +4.1% | 0.31% | +0.06 |
| AVUV Avantis US Small Cap Value | Add +42.9% | 0.17% | +0.06 |
| CTAS Cintas Corp. | Add +8.1% | 1.11% | +0.06 |
| DFIV Dimensional International Va | Add +57.3% | 0.15% | +0.06 |
| CL Colgate-Palmolive Co. | Add +0.2% | 1.12% | +0.05 |
| PAYX Paychex Inc. | Add +0.3% | 1.23% | +0.05 |
| DFEV Dimensional Emrg MRKT Val | Add +54.4% | 0.11% | +0.05 |
| AMZN Amazon.com Inc. | Add +1.7% | 0.42% | +0.05 |
| DFAT Dimensional US Target Value | Add +38.0% | 0.14% | +0.05 |
| ITW Illinois Tool Works | Add +3.0% | 1.15% | +0.05 |
| PG The Procter & Gamble Co. | Add +5.6% | 1.05% | +0.04 |
| FDS Factset Research Systems Inc. | Add +0.3% | 1.26% | +0.04 |
| RSG Republic Services Inc. | Add +34.6% | 0.19% | +0.04 |
| AXP American Express Co. | Add +17.5% | 0.18% | +0.04 |
| VRTX Vertex Pharmaceuticals Inc. | Add +9.2% | 0.25% | +0.04 |
| SPGI S&P Global Inc. | Add +10.5% | 1.15% | +0.03 |
| MCO Moody's Corp. | Add +23.6% | 0.17% | +0.03 |
| AMD Advanced Micro Devices | New | 0.03% | +0.03 |
| NVDA Nvidia Corp. | Add +7.2% | 0.19% | +0.03 |
| QCOM Qualcomm Inc. | Add +0.1% | 0.11% | +0.03 |
| GD General Dynamics Corp. | Add +1.6% | 1.39% | +0.03 |
| CHD Church & Dwight Co. Inc. | Add +1.6% | 1.05% | +0.03 |
| ORLY O'reilly Automotive Inc. | Add +32.9% | 0.12% | +0.03 |
| CAT Caterpillar Inc. | New | 0.03% | +0.03 |
| AON Aon PLC Class A | Add +16.6% | 0.19% | +0.03 |
| SPY SS SPDR S&P 500 ETF Trust-US | Add +2.4% | 0.20% | +0.03 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 166 | $856.7M | AAPL, GWW, MSFT, UNH, COST |
| Q1 2026 | 170 | $834.9M | AAPL, PSX, MSFT, COST, COR |
| Q4 2025 | 170 | $846.9M | AAPL, MSFT, WMT, COR, AVGO |
| Q3 2025 | 172 | $850.6M | AAPL, MSFT, WMT, COR, LOW |
| Q2 2025 | 170 | $832.4M | MSFT, AAPL, WMT, COR, COST |
| Q1 2025 | 163 | $785.4M | AAPL, BRO, MSFT, COST, COR |
| Q4 2024 | 160 | $767.4M | AAPL, MSFT, COST, WMT, GWW |
| Q3 2024 | 156 | $794.6M | AAPL, MSFT, LOW, COST, AFL |
| Q2 2024 | 157 | $723.8M | AAPL, MSFT, COST, PSX, LOW |
| Q1 2024 | 157 | $736.5M | MSFT, AAPL, PSX, LOW, GWW |