Mattern Capital Management, LLC

13F filer · CIK 0001803227

Reported Jul 24, 2026

Net buyer this quarter

13F portfolio value$857MU.S. long equity reported on 13F

Positions1313 new · 4 closed

Net flow last quarter+$1.42MBuys minus sells

Top 10 positions weight17.0%Concentration

Holdings

13F · last 4 quarters free

Scroll for earlier quarters

Company	Value	% of portfolio	% of company	POSITION CHANGE qoq %	First reported
Q2 2026Reported Jul 24, 2026131 positions
AAPLApple Inc.	$22.1M	2.58%	0.00%	-1.6%	Q4 2019
GWWW.W. Grainger, Inc.	$16.1M	1.88%	0.03%	-1.6%	Q4 2019
MSFTMicrosoft Corp	$15.3M	1.79%	0.00%	-0.6%	Q4 2019
UNHUnitedhealth Group Inc	$14.6M	1.71%	0.00%	-9.1%	Q4 2019
COSTCostco Wholesale Corp	$13.4M	1.57%	0.00%	-0.3%	Q4 2019
AVGOBroadcom Inc.	$13.3M	1.55%	0.00%	-5.4%	Q1 2024
CORCencora, Inc.	$13.3M	1.55%	0.02%	+11.5%	Q4 2019
AFLAflac Inc	$12.9M	1.51%	0.02%	-0.3%	Q4 2019
CSCOCisco Systems, Inc.	$12.5M	1.45%	0.00%	+5.4%	Q4 2019
LINLinde PLC	$12.3M	1.44%	0.01%	-1.4%	Q4 2019
CBChubb Ltd	$12.3M	1.43%	0.01%	-0.4%	Q4 2019
LLYELI LILLY & Co	$12.2M	1.43%	0.00%	+6.2%	Q1 2024
WECWec Energy Group, Inc.	$12.1M	1.42%	0.03%	-5.5%	Q4 2019
LOWLowes Companies Inc	$12.1M	1.41%	0.01%	+5.6%	Q4 2019
GDGeneral Dynamics Corp	$11.9M	1.39%	0.01%	+1.6%	Q4 2019
TXNTexas Instruments Inc	$11.8M	1.38%	0.00%	-2.2%	Q4 2019
NEENextera Energy Inc	$11.6M	1.35%	0.01%	-1.8%	Q4 2019
CMSCMS Energy Corp	$11.5M	1.35%	0.05%	-5.5%	Q4 2019
ADPAutomatic Data Processing Inc	$11.2M	1.31%	0.01%	+1.7%	Q4 2019
AWKAmerican Water Works Company, Inc.	$11.2M	1.30%	0.04%	-3.0%	Q4 2019
TTTrane Technologies plc	$11.1M	1.30%	0.01%	-4.0%	Q1 2026
APHAmphenol Corp	$11M	1.29%	0.01%	+18.4%	Q1 2025
BROBrown & Brown, Inc.	$10.9M	1.27%	0.05%	+19.0%	Q4 2019
SHWSherwin Williams Co	$10.8M	1.26%	0.01%	+7.2%	Q1 2020
FDSFactset Research Systems Inc	$10.8M	1.26%	0.13%	+0.3%	Q4 2019
LHXL3harris Technologies, Inc.	$10.6M	1.24%	0.02%	+5.5%	Q4 2019
HDHome Depot, Inc.	$10.6M	1.24%	0.00%	+10.1%	Q1 2020
WMTWalmart Inc.	$10.6M	1.24%	0.00%	+5.9%	Q4 2019
PAYXPaychex Inc	$10.6M	1.23%	0.03%	+0.3%	Q4 2019
ADIAnalog Devices Inc	$10.5M	1.22%	0.01%	-0.5%	Q4 2019
JPMJPMorgan Chase & Co	$10.4M	1.21%	0.00%	+510.4%	Q1 2024
ECLEcolab Inc.	$10.3M	1.20%	0.01%	+4.1%	Q4 2019
MSIMotorola Solutions, Inc.	$10.3M	1.20%	0.01%	+0.6%	Q1 2026
ATOAtmos Energy Corp	$10.2M	1.19%	0.04%	-0.6%	Q1 2020
BLKBlackRock, Inc.	$10.2M	1.19%	0.01%	+2.3%	Q4 2019
AMGNAmgen Inc	$10.1M	1.18%	0.01%	+17.2%	Q4 2019
JNJJohnson & Johnson	$10.1M	1.18%	0.00%	+12.8%	Q4 2019
VVisa Inc.	$10.1M	1.18%	0.00%	+9.5%	Q2 2023
PHParker-Hannifin Corp	$9.92M	1.16%	0.01%	+11.6%	Q1 2024
ABTAbbott Laboratories	$9.89M	1.15%	0.01%	+3.0%	Q4 2019
ITWIllinois Tool Works Inc	$9.88M	1.15%	0.01%	+3.0%	Q4 2019
XYLXylem Inc.	$9.86M	1.15%	0.04%	+10.2%	Q4 2019
WMWaste Management Inc	$9.84M	1.15%	0.01%	+4.3%	Q1 2024
SPGIS&P Global Inc.	$9.83M	1.15%	0.01%	+10.5%	Q4 2019
ROPRoper Technologies Inc	$9.82M	1.15%	0.03%	-0.1%	Q1 2025
NJRNew Jersey Resources Corp	$9.79M	1.14%	0.17%	-3.0%	Q4 2019
SYKStryker Corp	$9.78M	1.14%	0.01%	+16.6%	Q4 2019
PLDPrologis, Inc.	$9.67M	1.13%	0.01%	-1.5%	Q2 2022
CLColgate Palmolive Co	$9.58M	1.12%	0.01%	+0.2%	Q4 2019
CTASCintas Corp	$9.51M	1.11%	0.01%	+8.1%	Q3 2022

Q1 2026Reported May 4, 2026132 positions
AAPLApple Inc.	$19.7M	2.36%	0.00%	+1.1%	Q4 2019
PSXPhillips 66	$16.1M	1.93%	0.02%	-2.1%	Q4 2019
MSFTMicrosoft Corp	$15.3M	1.83%	0.00%	+16.1%	Q4 2019
COSTCostco Wholesale Corp	$14.4M	1.72%	0.00%	-1.2%	Q4 2019
CORCencora, Inc.	$13.2M	1.58%	0.02%	-1.3%	Q4 2019
GWWW.W. Grainger, Inc.	$13.1M	1.57%	0.03%	-1.9%	Q4 2019
WECWec Energy Group, Inc.	$12.7M	1.52%	0.03%	+29.1%	Q4 2019
NEENextera Energy Inc	$12.4M	1.49%	0.01%	-2.3%	Q4 2019
CMSCMS Energy Corp	$12.4M	1.48%	0.05%	+32.3%	Q4 2019
LOWLowes Companies Inc	$12.3M	1.47%	0.01%	-2.5%	Q4 2019
AFLAflac Inc	$12.1M	1.45%	0.02%	+1.6%	Q4 2019
LHXL3harris Technologies, Inc.	$12M	1.44%	0.02%	-5.1%	Q4 2019
LINLinde PLC	$11.9M	1.43%	0.01%	-0.9%	Q4 2019
AWKAmerican Water Works Company, Inc.	$11.9M	1.43%	0.04%	+36.7%	Q4 2019
CBChubb Ltd	$11.8M	1.41%	0.01%	-0.7%	Q4 2019
AVGOBroadcom Inc.	$11.5M	1.38%	0.00%	-1.5%	Q1 2024
GDGeneral Dynamics Corp	$11.3M	1.36%	0.01%	-0.9%	Q4 2019
ATOAtmos Energy Corp	$11M	1.32%	0.04%	+2.0%	Q1 2020
WMTWalmart Inc.	$11M	1.31%	0.00%	-38.4%	Q4 2019
ABTAbbott Laboratories	$10.9M	1.30%	0.01%	+48.8%	Q4 2019
MSIMotorola Solutions, Inc.	$10.7M	1.28%	0.01%	New	Q1 2026
UNHUnitedhealth Group Inc	$10.5M	1.26%	0.00%	+48.4%	Q4 2019
CEGConstellation Energy Corp	$10.4M	1.24%	0.01%	+57.0%	Q3 2025
ROPRoper Technologies Inc	$10.3M	1.23%	0.03%	+56.9%	Q1 2025
BRBroadridge Financial Solutions, Inc.	$10.2M	1.22%	0.05%	+41.4%	Q4 2019
FDSFactset Research Systems Inc	$10.1M	1.21%	0.13%	+53.7%	Q4 2019
ADPAutomatic Data Processing Inc	$10M	1.20%	0.01%	+35.4%	Q4 2019
INTUIntuit Inc.	$10M	1.20%	0.01%	+84.4%	Q1 2024
BLKBlackRock, Inc.	$9.99M	1.20%	0.01%	-0.2%	Q4 2019
NJRNew Jersey Resources Corp	$9.89M	1.18%	0.18%	-0.7%	Q4 2019
PAYXPaychex Inc	$9.88M	1.18%	0.03%	+45.8%	Q4 2019
TTTrane Technologies plc	$9.85M	1.18%	0.01%	New	Q1 2026
WMWaste Management Inc	$9.73M	1.17%	0.01%	+780.0%	Q1 2024
PLDPrologis, Inc.	$9.58M	1.15%	0.01%	-0.9%	Q2 2022
ACNAccenture plc	$9.53M	1.14%	0.01%	+33.6%	Q4 2019
ECLEcolab Inc.	$9.45M	1.13%	0.01%	-0.7%	Q4 2019
SHWSherwin Williams Co	$9.38M	1.12%	0.01%	+0.7%	Q1 2020
BROBrown & Brown, Inc.	$9.31M	1.11%	0.04%	+3.9%	Q4 2019
SPGIS&P Global Inc.	$9.29M	1.11%	0.01%	+4.0%	Q4 2019
MCDMcdonalds Corp	$9.28M	1.11%	0.00%	+0.1%	Q4 2019
ITWIllinois Tool Works Inc	$9.23M	1.11%	0.01%	-0.5%	Q4 2019
ICEIntercontinental Exchange, Inc.	$9.17M	1.10%	0.01%	-1.9%	Q1 2020
PEPPepsico Inc	$9.16M	1.10%	0.00%	+1.0%	Q4 2019
XYLXylem Inc.	$9.05M	1.08%	0.03%	+3.3%	Q4 2019
HDHome Depot, Inc.	$8.97M	1.07%	0.00%	+0.3%	Q1 2020
TSCOTractor Supply Co	$8.95M	1.07%	0.04%	+1.7%	Q2 2022
CLColgate Palmolive Co	$8.89M	1.06%	0.01%	-1.3%	Q4 2019
LLYELI LILLY & Co	$8.83M	1.06%	0.00%	-1.5%	Q1 2024
SYKStryker Corp	$8.76M	1.05%	0.01%	+0.8%	Q4 2019
CTASCintas Corp	$8.75M	1.05%	0.01%	+1.4%	Q3 2022

Q4 2025Reported Jan 29, 2026131 positions
AAPLApple Inc.	$20.9M	2.46%	0.00%	-2.9%	Q4 2019
MSFTMicrosoft Corp	$17.2M	2.03%	0.00%	-4.3%	Q4 2019
WMTWalmart Inc.	$16M	1.88%	0.00%	+1.4%	Q4 2019
CORCencora, Inc.	$14.4M	1.70%	0.02%	-3.4%	Q4 2019
AVGOBroadcom Inc.	$13.1M	1.54%	0.00%	-3.9%	Q1 2024
LOWLowes Companies Inc	$12.9M	1.52%	0.01%	+1.2%	Q4 2019
ADIAnalog Devices Inc	$12.9M	1.52%	0.01%	-8.0%	Q4 2019
COSTCostco Wholesale Corp	$12.6M	1.49%	0.00%	+5.1%	Q4 2019
GWWW.W. Grainger, Inc.	$12.3M	1.46%	0.03%	+4.8%	Q4 2019
AFLAflac Inc	$12M	1.42%	0.02%	+4.5%	Q4 2019
PSXPhillips 66	$11.7M	1.38%	0.02%	-2.8%	Q4 2019
CSCOCisco Systems, Inc.	$11.6M	1.37%	0.00%	+0.3%	Q4 2019
CBChubb Ltd	$11.4M	1.34%	0.01%	+1.0%	Q4 2019
AMGNAmgen Inc	$11.3M	1.34%	0.01%	-9.7%	Q4 2019
GDGeneral Dynamics Corp	$11.2M	1.32%	0.01%	-4.8%	Q4 2019
BLKBlackRock, Inc.	$11.1M	1.32%	0.01%	+3.0%	Q4 2019
NEENextera Energy Inc	$11M	1.30%	0.01%	-14.3%	Q4 2019
SPGIS&P Global Inc.	$11M	1.30%	0.01%	+0.4%	Q4 2019
BROBrown & Brown, Inc.	$10.9M	1.29%	0.04%	+3.8%	Q4 2019
LHXL3harris Technologies, Inc.	$10.8M	1.27%	0.02%	-7.3%	Q4 2019
LLYELI LILLY & Co	$10.5M	1.24%	0.00%	-10.7%	Q1 2024
LINLinde PLC	$10.4M	1.22%	0.01%	+4.0%	Q4 2019
PHParker-Hannifin Corp	$10.3M	1.22%	0.01%	-0.6%	Q1 2024
EMREmerson Electric Co	$10.3M	1.22%	0.01%	+4.4%	Q4 2019
JNJJohnson & Johnson	$10.2M	1.21%	0.00%	-4.2%	Q4 2019
XYLXylem Inc.	$9.98M	1.18%	0.03%	-6.4%	Q4 2019
BRBroadridge Financial Solutions, Inc.	$9.89M	1.17%	0.04%	+5.9%	Q4 2019
ATOAtmos Energy Corp	$9.81M	1.16%	0.04%	-2.6%	Q1 2020
TSCOTractor Supply Co	$9.72M	1.15%	0.04%	+1.0%	Q2 2022
ACNAccenture plc	$9.65M	1.14%	0.01%	-0.4%	Q4 2019
ICEIntercontinental Exchange, Inc.	$9.63M	1.14%	0.01%	+13.8%	Q1 2020
MDTMedtronic plc	$9.61M	1.13%	0.01%	+0.7%	Q4 2019
CTASCintas Corp	$9.59M	1.13%	0.01%	+13.0%	Q3 2022
TXNTexas Instruments Inc	$9.54M	1.13%	0.01%	+15.4%	Q4 2019
JKHYJack Henry & Associates Inc	$9.49M	1.12%	0.07%	+3.1%	Q4 2019
SHWSherwin Williams Co	$9.42M	1.11%	0.01%	+1.3%	Q1 2020
ECLEcolab Inc.	$9.39M	1.11%	0.01%	-0.1%	Q4 2019
ADPAutomatic Data Processing Inc	$9.39M	1.11%	0.01%	+7.1%	Q4 2019
HDHome Depot, Inc.	$9.36M	1.10%	0.00%	+1.6%	Q1 2020
PLDPrologis, Inc.	$9.34M	1.10%	0.01%	-2.3%	Q2 2022
SYKStryker Corp	$9.29M	1.10%	0.01%	+3.4%	Q4 2019
MCDMcdonalds Corp	$9.11M	1.08%	0.00%	+0.1%	Q4 2019
VVisa Inc.	$8.98M	1.06%	0.00%	+5.5%	Q2 2023
WECWec Energy Group, Inc.	$8.98M	1.06%	0.03%	+1.4%	Q4 2019
ABTAbbott Laboratories	$8.92M	1.05%	0.00%	+3.6%	Q4 2019
FDSFactset Research Systems Inc	$8.82M	1.04%	0.08%	+48.8%	Q4 2019
ITWIllinois Tool Works Inc	$8.78M	1.04%	0.01%	+2.1%	Q4 2019
TGTTarget Corp	$8.64M	1.02%	0.02%	+10.7%	Q4 2020
UNHUnitedhealth Group Inc	$8.63M	1.02%	0.00%	+16.9%	Q4 2019
APDAir Products & Chemicals, Inc.	$8.57M	1.01%	0.02%	+4.3%	Q4 2019

Q3 2025Reported Oct 21, 2025131 positions
AAPLApple Inc.	$20.1M	2.37%	0.00%	-2.2%	Q4 2019
MSFTMicrosoft Corp	$19.3M	2.27%	0.00%	-2.3%	Q4 2019
WMTWalmart Inc.	$14.6M	1.71%	0.00%	-2.2%	Q4 2019
CORCencora, Inc.	$13.8M	1.62%	0.02%	-6.2%	Q4 2019
LOWLowes Companies Inc	$13.3M	1.56%	0.01%	-1.2%	Q4 2019
AVGOBroadcom Inc.	$13M	1.52%	0.00%	-10.9%	Q1 2024
COSTCostco Wholesale Corp	$12.8M	1.51%	0.00%	-1.7%	Q4 2019
ADIAnalog Devices Inc	$12.7M	1.49%	0.01%	+9.8%	Q4 2019
PSXPhillips 66	$12.7M	1.49%	0.02%	-1.2%	Q4 2019
BROBrown & Brown, Inc.	$12.4M	1.46%	0.04%	+11.1%	Q4 2019
NEENextera Energy Inc	$12.1M	1.42%	0.01%	+12.3%	Q4 2019
LHXL3harris Technologies, Inc.	$12.1M	1.42%	0.02%	-2.0%	Q4 2019
GDGeneral Dynamics Corp	$11.9M	1.40%	0.01%	-1.8%	Q4 2019
BLKBlackRock, Inc.	$11.8M	1.38%	0.01%	+0.2%	Q4 2019
AFLAflac Inc	$11.6M	1.37%	0.02%	-0.8%	Q4 2019
XYLXylem Inc.	$11.6M	1.36%	0.03%	-1.8%	Q4 2019
GWWW.W. Grainger, Inc.	$11.1M	1.31%	0.02%	-1.2%	Q4 2019
LINLinde PLC	$11.1M	1.30%	0.01%	-1.1%	Q4 2019
TSCOTractor Supply Co	$10.9M	1.29%	0.04%	-1.3%	Q2 2022
HDHome Depot, Inc.	$10.8M	1.27%	0.00%	-1.0%	Q1 2020
AMGNAmgen Inc	$10.8M	1.27%	0.01%	+13.0%	Q4 2019
CSCOCisco Systems, Inc.	$10.3M	1.21%	0.00%	-7.4%	Q4 2019
ATOAtmos Energy Corp	$10.3M	1.21%	0.04%	-2.5%	Q1 2020
SPGIS&P Global Inc.	$10.2M	1.20%	0.01%	-1.2%	Q4 2019
CBChubb Ltd	$10.2M	1.19%	0.01%	-0.9%	Q4 2019
APHAmphenol Corp	$10M	1.18%	0.01%	+15.5%	Q1 2025
ADPAutomatic Data Processing Inc	$10M	1.18%	0.01%	-0.8%	Q4 2019
BRBroadridge Financial Solutions, Inc.	$9.97M	1.17%	0.04%	-1.0%	Q4 2019
SHWSherwin Williams Co	$9.93M	1.17%	0.01%	-0.7%	Q1 2020
ECLEcolab Inc.	$9.81M	1.15%	0.01%	-1.4%	Q4 2019
EMREmerson Electric Co	$9.74M	1.15%	0.01%	-7.0%	Q4 2019
WECWec Energy Group, Inc.	$9.62M	1.13%	0.03%	-0.9%	Q4 2019
JNJJohnson & Johnson	$9.58M	1.13%	0.00%	-1.0%	Q4 2019
MDTMedtronic plc	$9.46M	1.11%	0.01%	-0.9%	Q4 2019
SYKStryker Corp	$9.45M	1.11%	0.01%	-1.5%	Q4 2019
CTASCintas Corp	$9.26M	1.09%	0.01%	-0.4%	Q3 2022
ABTAbbott Laboratories	$9.2M	1.08%	0.00%	-3.5%	Q4 2019
ITWIllinois Tool Works Inc	$9.1M	1.07%	0.01%	-0.5%	Q4 2019
APDAir Products & Chemicals, Inc.	$9.08M	1.07%	0.02%	+0.7%	Q4 2019
MCDMcdonalds Corp	$9.05M	1.06%	0.00%	-0.6%	Q4 2019
PHParker-Hannifin Corp	$8.96M	1.05%	0.01%	+2.5%	Q1 2024
ACNAccenture plc	$8.9M	1.05%	0.01%	+21.0%	Q4 2019
SBUXStarbucks Corp	$8.87M	1.04%	0.01%	+0.6%	Q4 2019
ICEIntercontinental Exchange, Inc.	$8.8M	1.03%	0.01%	-4.8%	Q1 2020
HONHoneywell International Inc	$8.8M	1.03%	0.01%	0.0%	Q4 2019
TXNTexas Instruments Inc	$8.75M	1.03%	0.01%	+0.3%	Q4 2019
CMSCMS Energy Corp	$8.69M	1.02%	0.04%	+0.2%	Q4 2019
PLDPrologis, Inc.	$8.57M	1.01%	0.01%	-0.1%	Q2 2022
CBSHCommerce Bancshares Inc	$8.43M	0.99%	0.11%	-0.6%	Q4 2019
AWKAmerican Water Works Company, Inc.	$8.37M	0.98%	0.03%	0.0%	Q4 2019

Premium opens every quarter this fund has filed