Mattern Capital Management, LLC
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 4, 2026), Mattern Capital Management, LLC reported 170 stock positions worth $834.9 million. Its top holding was Apple (AAPL) at 2.4% of the portfolio, followed by Phillips 66 (PSX, 1.9%) and Microsoft (MSFT, 1.8%). Compared with Q4 2025, it opened 9 new positions, sold out of 9, added to 83 and reduced 55. The biggest buy was a new position in Motorola Solutions (MSI) and the biggest sale Emerson Electric (EMR, shares −98%).
- Most Recent 13F
- Q2 2026
- Location
- LAKEWOOD, CO
- CIK
- 0001803227
- Portfolio Value
- $834.9M (Q1 2026)
- SEC Filing
- 0001725547-26-000166 ↗ filed May 4, 2026
Holdings Value
Holdings 170 stocks · $834.9M
| AAPL Apple Inc. | 2.36% | 77,600 | $19.7M | Add +1.1% |
| PSX Phillips 66 | 1.93% | 88,599 | $16.1M | Reduce -2.0% |
| MSFT Microsoft Corp. | 1.83% | 41,344 | $15.3M | Add +16.1% |
| COST Costco Wholesale Corp. | 1.72% | 14,415 | $14.4M | Reduce -1.2% |
| COR Cencora Inc. | 1.58% | 41,995 | $13.2M | Reduce -1.3% |
| GWW WW Grainger Inc. | 1.57% | 12,008 | $13.1M | Reduce -1.9% |
| WEC WEC Energy Group Inc. | 1.52% | 109,948 | $12.7M | Add +29.1% |
| NEE Nextera Energy Inc. | 1.49% | 133,938 | $12.4M | Reduce -2.3% |
| CMS CMS Energy Corp. | 1.48% | 159,660 | $12.4M | Add +32.3% |
| LOW Lowe's Cos Inc. | 1.47% | 52,006 | $12.3M | Reduce -2.5% |
| AFL Aflac Inc. | 1.45% | 110,625 | $12.1M | Add +1.6% |
| LHX L3HARRIS Technologies Inc. | 1.44% | 34,741 | $12.0M | Reduce -5.1% |
| LIN Linde PLC | 1.43% | 24,079 | $11.9M | Reduce -0.9% |
| AWK American Water Works Co. Inc. | 1.43% | 87,602 | $11.9M | Add +36.7% |
| CB Chubb Ltd. | 1.41% | 36,121 | $11.8M | Reduce -0.7% |
| AVGO Broadcom Inc. | 1.38% | 37,221 | $11.5M | Reduce -1.5% |
| GD General Dynamics Corp. | 1.36% | 32,970 | $11.3M | Reduce -0.9% |
| ATO Atmos Energy Corp. | 1.32% | 59,706 | $11.0M | Add +2.0% |
| WMT Walmart Inc. | 1.31% | 88,217 | $11.0M | Reduce -38.4% |
| ABT Abbott Laboratories | 1.30% | 105,888 | $10.9M | Add +48.8% |
| MSI Motorola Solutions Inc. | 1.28% | 24,556 | $10.7M | New |
| UNH Unitedhealth Group Inc. | 1.26% | 38,785 | $10.5M | Add +48.4% |
| CEG Constellation Energy | 1.24% | 37,107 | $10.4M | Add +57.0% |
| ROP Roper Technologies Inc. | 1.23% | 29,054 | $10.3M | Add +56.9% |
| BR Broadridge Financial Solutio | 1.22% | 62,643 | $10.2M | Add +41.4% |
| FDS Factset Research Systems Inc. | 1.21% | 46,708 | $10.1M | Add +53.7% |
| ADP Automatic Data Processing | 1.20% | 49,385 | $10.0M | Add +35.4% |
| INTU Intuit Inc. | 1.20% | 23,151 | $10.0M | Add +84.4% |
| BLK BlackRock Inc. | 1.20% | 10,387 | $10.0M | Reduce -0.2% |
| NJR New Jersey Resources Corp. | 1.18% | 180,016 | $9.9M | Reduce -0.7% |
| PAYX Paychex Inc. | 1.18% | 107,298 | $9.9M | Add +45.8% |
| TT Trane Technologies PLC | 1.18% | 23,635 | $9.8M | New |
| WM Waste Management Inc. | 1.17% | 42,361 | $9.7M | Add +780.0% |
| PLD Prologis Inc. | 1.15% | 72,475 | $9.6M | Reduce -0.9% |
| ACN Accenture PLC Class A | 1.14% | 48,042 | $9.5M | Add +33.6% |
| ECL Ecolab Inc. | 1.13% | 35,517 | $9.4M | Reduce -0.7% |
| SHW The Sherwin-Williams Co. | 1.12% | 29,267 | $9.4M | Add +0.7% |
| BRO Brown & Brown Inc. | 1.11% | 142,695 | $9.3M | Add +3.9% |
| SPGI S&P Global Inc. | 1.11% | 21,839 | $9.3M | Add +4.0% |
| MCD McDonald's Corp. | 1.11% | 29,854 | $9.3M | Add +0.1% |
| ITW Illinois Tool Works | 1.11% | 35,455 | $9.2M | Reduce -0.5% |
| ICE Intercontinental Exchange Inc. | 1.10% | 58,322 | $9.2M | Reduce -1.9% |
| PEP Pepsico Inc. | 1.10% | 58,984 | $9.2M | Add +1.0% |
| XYL Xylem Inc. | 1.08% | 75,709 | $9.0M | Add +3.3% |
| HD Home Depot Inc. | 1.07% | 27,262 | $9.0M | Add +0.3% |
| TSCO Tractor Supply Company | 1.07% | 197,679 | $9.0M | Add +1.7% |
| CL Colgate-Palmolive Co. | 1.06% | 104,252 | $8.9M | Reduce -1.3% |
| LLY Eli Lilly & Co. | 1.06% | 9,597 | $8.8M | Reduce -1.5% |
| SYK Stryker Corp. | 1.05% | 26,650 | $8.8M | Add +0.8% |
| CTAS Cintas Corp. | 1.05% | 51,728 | $8.7M | Add +1.4% |
| MDT Medtronic PLC | 1.04% | 100,264 | $8.7M | Add +0.2% |
| JNJ Johnson & Johnson | 1.03% | 35,344 | $8.6M | Reduce -28.6% |
| CHD Church & Dwight Co. Inc. | 1.02% | 91,413 | $8.5M | Add +0.3% |
| ADI Analog Devices Inc. | 1.01% | 26,524 | $8.4M | Reduce -44.1% |
| AMGN Amgen Inc. | 1.01% | 23,890 | $8.4M | Reduce -30.9% |
| PG The Procter & Gamble Co. | 1.00% | 57,944 | $8.4M | Add +0.3% |
| JKHY Jack Henry & Associates Inc. filed as HENRY JACK & ASSOC INC | 0.99% | 52,106 | $8.2M | Add +0.2% |
| ZTS Zoetis Inc. | 0.98% | 69,257 | $8.2M | Add +4.0% |
| V Visa Inc. Class A | 0.98% | 26,960 | $8.1M | Add +5.3% |
| PH Parker Hannifin Corp. | 0.97% | 9,085 | $8.1M | Reduce -22.7% |
| MDLZ Mondelez International Inc. Class A | 0.97% | 140,878 | $8.1M | Add +2.0% |
| PPG PPG Industries Inc. | 0.97% | 75,679 | $8.1M | Reduce -6.1% |
| CBSH Commerce Bancshares Inc. | 0.96% | 162,241 | $8.0M | Add +0.6% |
| MA Mastercard Inc. Class A | 0.96% | 15,960 | $8.0M | Add +11.8% |
| TXN Texas Instruments Inc. | 0.94% | 40,424 | $7.8M | Reduce -26.5% |
| CSCO Cisco Systems Inc. | 0.94% | 100,650 | $7.8M | Reduce -33.4% |
| WRB WR Berkley Corp. filed as BERKLEY W R CORP | 0.90% | 112,872 | $7.5M | Add +5.6% |
| NKE Nike Inc. Class B | 0.85% | 135,125 | $7.1M | Add +2.7% |
| APH Amphenol Corp. Class A | 0.80% | 52,880 | $6.7M | Reduce -16.4% |
| BDX Becton Dickinson and Co. | 0.78% | 41,673 | $6.6M | Add +2.4% |
| VOO Vanguard S&P 500 ETF | 0.75% | 10,470 | $6.3M | No change |
| MKC McCormick & Co.-Non VTG SHRS | 0.75% | 123,731 | $6.2M | Add +5.1% |
| AVIG Avantis Core Fixed Income | 0.73% | 146,079 | $6.1M | Add +0.1% |
| JBND JPMorgan Active Bond ETF | 0.70% | 108,340 | $5.8M | Add +0.5% |
| FRT Federal Realty Invs Trust | 0.69% | 54,361 | $5.8M | Reduce -33.1% |
| O Realty Income Corp. | 0.67% | 91,836 | $5.6M | Reduce -34.1% |
| USFR Wisdomtree Floating Rate Tre | 0.41% | 68,713 | $3.5M | New |
| QQQ Invesco QQQ Trust Series 1 | 0.38% | 5,431 | $3.1M | Reduce -8.1% |
| AMZN Amazon.com Inc. | 0.37% | 14,835 | $3.1M | Add +3.6% |
| DIA SS SPDR Dow Jones Indus Avg filed as STATE STR SPDR DOW JONES IND | 0.35% | 6,297 | $2.9M | No change |
| VNLA Janus Henderson Short Durati | 0.34% | 57,761 | $2.8M | Add +39.9% |
| NFLX Netflix Inc. | 0.32% | 27,783 | $2.7M | Add +79.2% |
| TFLO iShares Treasury Floating Ra | 0.32% | 52,412 | $2.7M | New |
| AVLV Avantis US Large Cap Value | 0.30% | 30,921 | $2.5M | Add +41.3% |
| VTEB Vanguard Tax-Exempt Bond ETF | 0.27% | 45,720 | $2.3M | Add +4.3% |
| COP Conocophillips | 0.27% | 17,193 | $2.3M | Add +2.9% |
| CVX Chevron Corp. | 0.26% | 10,648 | $2.2M | Add +2.1% |
| IWD iShares Russell 1000 Value E | 0.26% | 10,246 | $2.2M | Add +2.3% |
| GOOG Alphabet Inc. Class C | 0.25% | 7,229 | $2.1M | Add +7.2% |
| CRM Salesforce Inc. | 0.24% | 10,927 | $2.0M | Add +119.4% |
| TSM Taiwan Semiconductor-SP ADR | 0.23% | 5,567 | $1.9M | Add +3.3% |
| DUHP Dimensional US High Profi Et | 0.22% | 49,586 | $1.8M | Add +49.1% |
| VRTX Vertex Pharmaceuticals Inc. | 0.21% | 3,877 | $1.7M | Add +5.1% |
| NVO Novo-Nordisk A/S-Spons ADR | 0.20% | 46,324 | $1.7M | Add +55.5% |
| TYL Tyler Technologies Inc. | 0.20% | 4,960 | $1.7M | Add +133.7% |
| ASML ASML Holding NV-NY Reg SHS filed as ASML HLDG NV | 0.18% | 1,168 | $1.5M | Add +2.5% |
| JPM JPMorgan Chase & Co. | 0.18% | 5,195 | $1.5M | Add +4.4% |
| MSCI MSCI Inc. | 0.18% | 2,764 | $1.5M | New |
| SPY SS SPDR S&P 500 ETF Trust-US | 0.17% | 2,231 | $1.5M | No change |
| BRK.B Berkshire Hathaway Inc. Class B | 0.17% | 2,992 | $1.4M | Add +5.7% |
Portfolio Sells Q4 2025 → Q1 2026
| EMR Emerson Electric Co. | Reduce -98.0% | 0.02% | −1.19 |
| APD Air Products & Chemicals Inc. | Sold out | 0.00% | −1.01 |
| TGT Target Corp. | Reduce -98.1% | 0.02% | −1.00 |
| BF.B Brown-Forman Corp. Class B | Sold out | 0.00% | −0.82 |
| WMT Walmart Inc. | Reduce -38.4% | 1.31% | −0.57 |
| ADI Analog Devices Inc. | Reduce -44.1% | 1.01% | −0.51 |
| CSCO Cisco Systems Inc. | Reduce -33.4% | 0.94% | −0.44 |
| AMGN Amgen Inc. | Reduce -30.9% | 1.01% | −0.33 |
| FRT Federal Realty Invs Trust | Reduce -33.1% | 0.69% | −0.28 |
| O Realty Income Corp. | Reduce -34.1% | 0.67% | −0.25 |
| SHY iShares 1-3 Year Treasury Bo | Reduce -89.8% | 0.03% | −0.25 |
| PH Parker Hannifin Corp. | Reduce -22.7% | 0.97% | −0.25 |
| APH Amphenol Corp. Class A | Reduce -16.4% | 0.80% | −0.21 |
| ADBE Adobe Inc. | Sold out | 0.00% | −0.20 |
| TXN Texas Instruments Inc. | Reduce -26.5% | 0.94% | −0.19 |
| IGSB iShares 1-5Y Inv Grade Corp. | Sold out | 0.00% | −0.18 |
| LLY Eli Lilly & Co. | Reduce -1.5% | 1.06% | −0.18 |
| JNJ Johnson & Johnson | Reduce -28.6% | 1.03% | −0.17 |
| AVGO Broadcom Inc. | Reduce -1.5% | 1.38% | −0.16 |
| TSLA Tesla Inc. | Reduce -54.2% | 0.10% | −0.16 |
| BAX Baxter International Inc. | Sold out | 0.00% | −0.16 |
| DG Dollar General Corp. | Reduce -56.7% | 0.08% | −0.13 |
| SHV iShares 0-1 Year Treasury Bo | Sold out | 0.00% | −0.12 |
| BLK BlackRock Inc. | Reduce -0.2% | 1.20% | −0.12 |
| COR Cencora Inc. | Reduce -1.3% | 1.58% | −0.12 |
| DLTR Dollar Tree Inc. | Reduce -49.4% | 0.09% | −0.11 |
| AZO AutoZone Inc. | Sold out | 0.00% | −0.10 |
| DECK Deckers Outdoor Corp. | Reduce -25.3% | 0.15% | −0.06 |
| QQQ Invesco QQQ Trust Series 1 | Reduce -8.1% | 0.38% | −0.05 |
| ISTB iShares Core 1-5 Year Usd Bo | Reduce -53.9% | 0.05% | −0.05 |
| LOW Lowe's Cos Inc. | Reduce -2.5% | 1.47% | −0.05 |
| VB Vanguard Most SM-Cap ETF-Usd | Reduce -59.4% | 0.03% | −0.04 |
| VNQ Vanguard Real Estate ETF | Sold out | 0.00% | −0.04 |
| ICE Intercontinental Exchange Inc. | Reduce -1.9% | 1.10% | −0.04 |
| IBDR iShares Ibonds Dec 2026 Term | Reduce -54.1% | 0.03% | −0.04 |
| SOLS Solstice Adv Materials Inc. | Sold out | 0.00% | −0.03 |
| SBUX Starbucks Corp. | Reduce -31.8% | 0.05% | −0.02 |
| IBDS Ishrs Ibnds Dec 27 Corp. ETF | Reduce -27.0% | 0.05% | −0.02 |
| HON Honeywell International Inc. | Reduce -30.8% | 0.05% | −0.01 |
| PPG PPG Industries Inc. | Reduce -6.1% | 0.97% | −0.01 |
| PWZ Invesco California Amt-Free | Reduce -6.3% | 0.09% | −0.01 |
| CMF iShares California Muni Bond | Reduce -6.8% | 0.08% | −0.01 |
| IBTH iShares Ibonds Dec 2027 Term | Reduce -18.0% | 0.03% | −0.01 |
| IBTG iShares Ibonds Dec 2026 Term | Reduce -17.3% | 0.03% | −0.01 |
| VLUE iShares MSCI USA Value Facto | Reduce -10.1% | 0.04% | −0.00 |
| IVW iShares S&P 500 Growth ETF | Reduce -0.1% | 0.02% | −0.00 |
| INMU iShares Intermediate Muni Inc. | Reduce -2.8% | 0.04% | −0.00 |
| DGRO iShares Core Dividend Growth | Reduce -3.5% | 0.03% | −0.00 |
| RTX RTX Corp. | Reduce -2.5% | 0.07% | +0.00 |
| LMT Lockheed Martin Corp. | Reduce -6.5% | 0.07% | +0.01 |
Portfolio Buys Q4 2025 → Q1 2026
| MSI Motorola Solutions Inc. | New | 1.28% | +1.28 |
| TT Trane Technologies PLC | New | 1.18% | +1.18 |
| WM Waste Management Inc. | Add +780.0% | 1.17% | +1.04 |
| CMS CMS Energy Corp. | Add +32.3% | 1.48% | +0.49 |
| WEC WEC Energy Group Inc. | Add +29.1% | 1.52% | +0.46 |
| AWK American Water Works Co. Inc. | Add +36.7% | 1.43% | +0.44 |
| USFR Wisdomtree Floating Rate Tre | New | 0.41% | +0.41 |
| TFLO iShares Treasury Floating Ra | New | 0.32% | +0.32 |
| ROP Roper Technologies Inc. | Add +56.9% | 1.23% | +0.26 |
| CEG Constellation Energy | Add +57.0% | 1.24% | +0.26 |
| ABT Abbott Laboratories | Add +48.8% | 1.30% | +0.25 |
| UNH Unitedhealth Group Inc. | Add +48.4% | 1.26% | +0.24 |
| INTU Intuit Inc. | Add +84.4% | 1.20% | +0.22 |
| PAYX Paychex Inc. | Add +45.8% | 1.18% | +0.21 |
| MSCI MSCI Inc. | New | 0.18% | +0.18 |
| FDS Factset Research Systems Inc. | Add +53.7% | 1.21% | +0.17 |
| IT Gartner Inc. | New | 0.17% | +0.17 |
| ATO Atmos Energy Corp. | Add +2.0% | 1.32% | +0.16 |
| NFLX Netflix Inc. | Add +79.2% | 0.32% | +0.15 |
| CHD Church & Dwight Co. Inc. | Add +0.3% | 1.02% | +0.12 |
| PEP Pepsico Inc. | Add +1.0% | 1.10% | +0.11 |
| AVLV Avantis US Large Cap Value | Add +41.3% | 0.30% | +0.10 |
| VNLA Janus Henderson Short Durati | Add +39.9% | 0.34% | +0.10 |
| MDLZ Mondelez International Inc. Class A | Add +2.0% | 0.97% | +0.10 |
| ADP Automatic Data Processing | Add +35.4% | 1.20% | +0.09 |
| TYL Tyler Technologies Inc. | Add +133.7% | 0.20% | +0.09 |
| CRM Salesforce Inc. | Add +119.4% | 0.24% | +0.09 |
| COP Conocophillips | Add +2.9% | 0.27% | +0.09 |
| CVX Chevron Corp. | Add +2.1% | 0.26% | +0.08 |
| DUHP Dimensional US High Profi Et | Add +49.1% | 0.22% | +0.07 |
| IVV iShares Core S&P 500 ETF | Add +217.9% | 0.08% | +0.05 |
| BR Broadridge Financial Solutio | Add +41.4% | 1.22% | +0.05 |
| VZ Verizon Communications Inc. | New | 0.04% | +0.04 |
| ASML ASML Holding NV-NY Reg SHS | Add +2.5% | 0.18% | +0.04 |
| PWR Quanta Services Inc. | New | 0.04% | +0.04 |
| AVUV Avantis US Small Cap Value | Add +36.9% | 0.11% | +0.04 |
| DFIV Dimensional International Va | Add +48.9% | 0.10% | +0.04 |
| AFL Aflac Inc. | Add +1.6% | 1.45% | +0.04 |
| MCD McDonald's Corp. | Add +0.1% | 1.11% | +0.04 |
| TSM Taiwan Semiconductor-SP ADR | Add +3.3% | 0.23% | +0.03 |
| WSO Watsco Inc. | Add +12.1% | 0.16% | +0.03 |
| KMI Kinder Morgan Inc. | New | 0.03% | +0.03 |
| MCO Moody's Corp. | Add +47.1% | 0.13% | +0.03 |
| RSG Republic Services Inc. | Add +17.2% | 0.15% | +0.03 |
| DFAT Dimensional US Target Value | Add +31.2% | 0.09% | +0.03 |
| DFEV Dimensional Emrg MRKT Val | Add +56.2% | 0.06% | +0.03 |
| NVO Novo-Nordisk A/S-Spons ADR | Add +55.5% | 0.20% | +0.02 |
| PG The Procter & Gamble Co. | Add +0.3% | 1.00% | +0.02 |
| ORLY O'reilly Automotive Inc. | Add +24.9% | 0.10% | +0.02 |
| JTEK JPMorgan US Tech Leaders | Add +51.5% | 0.07% | +0.02 |
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 |