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Dudley & Shanley, Inc.

13F filer · CIK 0000883511
Reported Jul 9, 2026
Net buyer this quarter
13F portfolio value$662MU.S. long equity reported on 13F
Positions361 new · 0 closed
Net flow last quarter+$27.4MBuys minus sells
Top 10 positions weight49.8%Concentration

Holdings

13F · last 4 quarters free
Scroll for earlier quarters
CompanyValue% of portfolio% of companyPOSITION CHANGE qoq %First reported
Q2 2026Reported Jul 9, 202636 positions
WPMWheaton Precious Metals Corp.$51.1M7.71%0.10%-1.0%Q2 2020
APHAmphenol Corp$41.3M6.24%0.02%-4.6%Q1 2022
AMEAmetek Inc/$33.8M5.10%0.06%0.0%Q1 2018
VVisa Inc.$33.3M5.02%0.01%-0.2%Q1 2018
WSOWatsco Inc$32.5M4.91%Not reported+40.1%Q1 2015
AONAon plc$29.5M4.45%0.04%0.0%Q3 2013
ECLEcolab Inc.$29.2M4.40%0.04%-0.3%Q2 2013
SCIService Corp International$27.9M4.22%0.27%0.0%Q1 2015
ADIAnalog Devices Inc$26.7M4.03%0.01%-29.4%Q3 2016
FERGFerguson Enterprises Inc.$24.7M3.73%0.05%+0.1%Q4 2024
DCIDONALDSON Co INC$24.4M3.69%0.23%+0.7%Q1 2024
KAIKadant Inc$23.8M3.59%0.64%Not reportedQ1 2022
FASTFastenal Co$22.7M3.43%0.04%+160.7%Q2 2013
AWKAmerican Water Works Company, Inc.$22.3M3.36%0.09%+0.2%Q1 2023
SCHWSchwab Charles Corp$22.2M3.36%0.01%Not reportedQ1 2024
FSSFederal Signal Corp$21.8M3.28%0.28%+169.9%Q1 2026
XYLXylem Inc.$21.4M3.23%0.08%+124.0%Q2 2013
ROLRollins Inc$20.7M3.12%0.10%+8.8%Q2 2023
KRNTKornit Digital Ltd.$20.4M3.08%2.71%+0.1%Q4 2022
ALSNAllison Transmission Holdings Inc$18.6M2.81%0.20%+0.3%Q1 2022
RYANRyan Specialty Holdings, Inc.$17.6M2.65%0.42%-3.1%Q1 2022
PGRProgressive Corp$14.5M2.19%0.01%Not reportedQ2 2020
DHRDanaher Corp$14.1M2.13%0.01%-35.6%Q2 2020
NXENexGen Energy Ltd.$11.5M1.74%0.19%+0.1%Q1 2015
BMIBadger Meter Inc$9.35M1.41%0.22%-48.4%Q4 2025
AAgilent Technologies, Inc.$9.23M1.39%0.02%+25.9%Q3 2024
WATWaters Corp$8.85M1.34%0.02%+101.3%Q2 2013
HEIHeico Corp$6.95M1.05%0.04%Not reportedQ1 2022
FISVFiserv Inc$5.42M0.82%0.02%-23.2%Q2 2013
GNRCGenerac Holdings Inc.$4.73M0.71%0.03%-17.8%Q4 2022
PFEPfizer Inc$3.97M0.60%0.00%Not reportedQ1 2022
MSFTMicrosoft Corp$3.94M0.60%0.00%Not reportedQ2 2013
ORAOrmat Technologies, Inc.$2.84M0.43%0.04%-6.8%Q1 2018
ROPRoper Technologies Inc$677K0.10%0.00%Not reportedQ1 2018
VNOMViper Energy, Inc.$326K0.05%Not reportedNot reportedQ4 2025
STLNFStallion Uranium Corp.$25.4K0.00%Not reportedNot reportedQ3 2025
Q1 2026Reported Apr 8, 202635 positions
WPMWheaton Precious Metals Corp.$60.2M9.85%0.10%-31.3%Q2 2020
APHAmphenol Corp$31.1M5.08%0.02%-13.1%Q1 2022
SCIService Corp International$30.3M4.96%0.27%Not reportedQ1 2015
ADIAnalog Devices Inc$30.3M4.95%0.02%-23.9%Q3 2016
AMEAmetek Inc/$30M4.90%0.06%0.0%Q1 2018
VVisa Inc.$29.4M4.80%0.01%-0.1%Q1 2018
AONAon plc$28.7M4.69%0.04%Not reportedQ3 2013
ECLEcolab Inc.$27.9M4.57%0.04%-0.1%Q2 2013
ROLRollins Inc$24.3M3.98%0.09%Not reportedQ2 2023
FERGFerguson Enterprises Inc.$24.3M3.98%0.05%Not reportedQ4 2024
AWKAmerican Water Works Company, Inc.$23M3.76%0.09%Not reportedQ1 2023
DCIDONALDSON Co INC$22.9M3.75%0.23%Not reportedQ1 2024
SCHWSchwab Charles Corp$22.6M3.70%0.01%Not reportedQ1 2024
KAIKadant Inc$22.1M3.62%0.64%+37.4%Q1 2022
DHRDanaher Corp$21.8M3.56%0.02%Not reportedQ2 2020
WSOWatsco Inc$20.3M3.31%Not reportedNot reportedQ1 2015
ALSNAllison Transmission Holdings Inc$19.3M3.15%0.20%Not reportedQ1 2022
BMIBadger Meter Inc$18.6M3.04%0.42%+47.7%Q4 2025
KRNTKornit Digital Ltd.$18.4M3.01%2.71%+39.1%Q4 2022
RYANRyan Specialty Holdings, Inc.$16.2M2.65%0.44%+0.5%Q1 2022
NXENexGen Energy Ltd.$14.2M2.32%0.19%-0.9%Q1 2015
PGRProgressive Corp$13.1M2.15%0.01%Not reportedQ2 2020
XYLXylem Inc.$9.66M1.58%0.03%Not reportedQ2 2013
FASTFastenal Co$8.41M1.38%0.02%+2435.0%Q2 2013
FISVFiserv Inc$8.03M1.31%0.03%Not reportedQ2 2013
FSSFederal Signal Corp$6.78M1.11%0.10%NewQ1 2026
AAgilent Technologies, Inc.$6.29M1.03%0.02%Not reportedQ3 2024
HEIHeico Corp$5.35M0.87%0.04%Not reportedQ1 2022
MSFTMicrosoft Corp$3.91M0.64%0.00%Not reportedQ2 2013
GNRCGenerac Holdings Inc.$3.84M0.63%0.03%Not reportedQ4 2022
WATWaters Corp$3.49M0.57%0.01%Not reportedQ2 2013
ORAOrmat Technologies, Inc.$3.13M0.51%0.05%Not reportedQ1 2018
ROPRoper Technologies Inc$708K0.12%0.00%-88.5%Q1 2018
VNOMViper Energy, Inc.$362K0.06%Not reportedNot reportedQ4 2025
STLNFStallion Uranium Corp.$60.6K0.01%Not reported+111.8%Q3 2025
Q4 2025Reported Jan 9, 202632 positions
WPMWheaton Precious Metals Corp.$78.6M12.63%0.15%-3.9%Q2 2020
APHAmphenol Corp$38.2M6.14%0.02%-10.6%Q1 2022
VVisa Inc.$34.1M5.48%0.01%0.0%Q1 2018
ADIAnalog Devices Inc$33.9M5.45%0.03%0.0%Q3 2016
AONAon plc$31.3M5.04%0.04%+0.1%Q3 2013
AMEAmetek Inc/$28.7M4.61%0.06%0.0%Q1 2018
SCIService Corp International$28.7M4.61%0.26%-0.5%Q1 2015
ECLEcolab Inc.$27.6M4.43%0.04%+0.1%Q2 2013
ROLRollins Inc$27.4M4.40%0.09%0.0%Q2 2023
DHRDanaher Corp$26.3M4.23%0.02%-0.1%Q2 2020
RYANRyan Specialty Holdings, Inc.$24.7M3.96%0.43%+3.4%Q1 2022
SCHWSchwab Charles Corp$24.1M3.87%0.01%0.0%Q1 2024
DCIDONALDSON Co INC$24M3.85%0.23%-0.1%Q1 2024
FERGFerguson Enterprises Inc.$23.2M3.73%0.05%+38.0%Q4 2024
AWKAmerican Water Works Company, Inc.$22.1M3.55%0.09%-0.1%Q1 2023
WSOWatsco Inc$18.8M3.02%Not reported+41.5%Q1 2015
ALSNAllison Transmission Holdings Inc$16.1M2.59%0.20%0.0%Q1 2022
KAIKadant Inc$15.7M2.52%0.47%-0.1%Q1 2022
PGRProgressive Corp$15.1M2.43%0.01%+3.2%Q2 2020
BMIBadger Meter Inc$14.4M2.32%0.22%NewQ4 2025
KRNTKornit Digital Ltd.$13M2.08%1.95%-28.4%Q4 2022
NXENexGen Energy Ltd.$11.4M1.83%0.19%Not reportedQ1 2015
FISVFiserv Inc$9.67M1.55%0.03%-17.7%Q2 2013
ROPRoper Technologies Inc$7.77M1.25%0.02%+584.5%Q1 2018
AAgilent Technologies, Inc.$7.51M1.21%0.02%Not reportedQ3 2024
HEIHeico Corp$6.31M1.01%0.04%Not reportedQ1 2022
MSFTMicrosoft Corp$5.11M0.82%0.00%-2.6%Q2 2013
ORAOrmat Technologies, Inc.$3.09M0.50%0.05%-7.3%Q1 2018
GNRCGenerac Holdings Inc.$2.68M0.43%0.03%Not reportedQ4 2022
VNOMViper Energy, Inc.$297K0.05%Not reportedNewQ4 2025
FASTFastenal Co$287K0.05%0.00%Not reportedQ2 2013
STLNFStallion Uranium Corp.$20.2K0.00%Not reported+183.3%Q3 2025
Q3 2025Reported Oct 8, 202531 positions
WPMWheaton Precious Metals Corp.$77.8M12.52%0.15%-8.9%Q2 2020
APHAmphenol Corp$39.2M6.30%0.03%-26.0%Q1 2022
VVisa Inc.$33.2M5.34%0.01%0.0%Q1 2018
AONAon plc$31.6M5.09%0.04%+0.1%Q3 2013
SCIService Corp International$30.7M4.95%0.26%+0.1%Q1 2015
ADIAnalog Devices Inc$30.7M4.94%0.03%+1.6%Q3 2016
ECLEcolab Inc.$28.8M4.63%0.04%Not reportedQ2 2013
ROLRollins Inc$26.8M4.31%0.09%-0.3%Q2 2023
AMEAmetek Inc/$26.3M4.23%0.06%+0.1%Q1 2018
RYANRyan Specialty Holdings, Inc.$26M4.19%0.42%0.0%Q1 2022
AWKAmerican Water Works Company, Inc.$23.5M3.79%0.09%+4.9%Q1 2023
SCHWSchwab Charles Corp$23M3.70%0.01%0.0%Q1 2024
DHRDanaher Corp$22.8M3.67%0.02%+4.9%Q2 2020
FISVFiserv Inc$22.6M3.63%0.03%+3.3%Q2 2013
DCIDONALDSON Co INC$22.1M3.56%0.23%+29.4%Q1 2024
DOXAmdocs Ltd$20.2M3.25%0.23%+0.3%Q4 2022
KRNTKornit Digital Ltd.$17M2.73%2.73%+97.5%Q4 2022
FERGFerguson Enterprises Inc.$17M2.73%0.04%Not reportedQ4 2024
KAIKadant Inc$16.4M2.64%0.47%Not reportedQ1 2022
WSOWatsco Inc$15.9M2.56%Not reported-1.2%Q1 2015
PGRProgressive Corp$15.9M2.55%0.01%Not reportedQ2 2020
ALSNAllison Transmission Holdings Inc$14M2.25%0.20%Not reportedQ1 2022
NXENexGen Energy Ltd.$11.1M1.78%0.22%-0.2%Q1 2015
AAgilent Technologies, Inc.$7.08M1.14%0.02%Not reportedQ3 2024
HEIHeico Corp$6.29M1.01%0.04%-0.3%Q1 2022
MSFTMicrosoft Corp$5.62M0.90%0.00%Not reportedQ2 2013
GNRCGenerac Holdings Inc.$3.29M0.53%0.03%Not reportedQ4 2022
ORAOrmat Technologies, Inc.$2.91M0.47%0.05%+0.7%Q1 2018
ROPRoper Technologies Inc$1.27M0.20%0.00%Not reportedQ1 2018
OCULOcular Therapeutix, Inc$152K0.02%0.01%-20.7%Q2 2024
STLNFStallion Uranium Corp.$9.6K0.00%Not reportedNewQ3 2025
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