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DUDLEY & SHANLEY, INC.
Period ended Sep 30, 2026 · Latest filing Oct 6, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Sep 30, 2026: $629,160,693
More quarters will appear as history becomes available.
Top holdings
Top 10 at Sep 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- Wheaton Precious Mtls · COM · 962879102 · shares: $56,350,678
- Ametek Inc. · COM · 031100100 · shares: $31,521,908
- Visa Inc. · COM · 92826C839 · shares: $30,334,279
- Ecolab Inc. · COM · 278865100 · shares: $27,195,227
- Service Corp. Int'l · COM · 817565104 · shares: $26,075,664
- Amphenol Corp. · COM · 032095101 · shares: $25,949,900
- Analog Devices · COM · 032654105 · shares: $25,642,938
- Aon plc · COM · g0403h108 · shares: $23,581,358
- Donaldson Co., Inc. · COM · 257651109 · shares: $22,645,197
- Fastenal Co. · COM · 311900104 · shares: $22,533,178
Reported holdings
37 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| Wheaton Precious Mtls | COM | 962879102 | — | 275,697 shares | $36,866,203 |
| Ametek Inc. | COM | 031100100 | — | 127,243 shares | $31,521,908 |
| Visa Inc. | COM | 92826C839 | — | 84,419 shares | $30,334,279 |
| Ecolab Inc. | COM | 278865100 | — | 99,043 shares | $27,195,227 |
| Service Corp. Int'l | COM | 817565104 | — | 342,425 shares | $26,075,664 |
| Amphenol Corp. | COM | 032095101 | — | 307,828 shares | $25,949,900 |
| Analog Devices | COM | 032654105 | — | 64,639 shares | $25,642,938 |
| Aon plc | COM | g0403h108 | — | 85,202 shares | $23,581,358 |
| Donaldson Co., Inc. | COM | 257651109 | — | 260,170 shares | $22,645,197 |
| Fastenal Co. | COM | 311900104 | — | 454,940 shares | $22,533,178 |
| Ferguson Enterprises | COM | 31488V107 | — | 100,032 shares | $22,269,124 |
| Progressive Corp. | COM | 743315103 | — | 104,152 shares | $21,591,751 |
| Amer. Water Works | COM | 030420103 | — | 160,550 shares | $20,786,408 |
| Charles Schwab | COM | 808513105 | — | 211,965 shares | $20,717,459 |
| Tyler Technologies | COM | 902252105 | — | 64,400 shares | $20,517,840 |
| Roper Technologies | COM | 776696106 | — | 57,325 shares | $20,029,928 |
| Allison Transmission | COM | 01973R101 | — | 175,274 shares | $19,851,533 |
| Wheaton Precious Mtls | COM | 962879102 | — | 145,711 shares | $19,484,475 |
| Kornit Digital | COM | M6372Q113 | — | 1,168,545 shares | $19,421,218 |
| Federal Signal Corp | COM | 313855108 | — | 174,050 shares | $19,282,999 |
| Kadant Inc. | COM | 48282T104 | — | 72,782 shares | $19,033,949 |
| Xylem Inc. | COM | 98419M100 | — | 170,310 shares | $17,247,294 |
| Ryan Specialty Hldngs | COM | 78351F107 | — | 465,889 shares | $17,237,893 |
| Danaher Corp. | COM | 235851102 | — | 71,195 shares | $15,773,252 |
| Watsco, Inc. | COM | 942622200 | — | 51,565 shares | $15,608,210 |
| NexGen Energy Ltd. | COM | 65340P106 | — | 1,225,500 shares | $11,196,617 |
| Agilent Tech, Inc. | COM | 00846U101 | — | 64,550 shares | $11,122,610 |
| Badger Meter Inc | COM | 056525108 | — | 84,600 shares | $10,451,484 |
| Waters Corporation | COM | 941848103 | — | 23,590 shares | $10,365,210 |
| HEICO Corp. | COM | 422806109 | — | 19,000 shares | $5,760,420 |
| Microsoft Corp. | COM | 594918104 | — | 10,569 shares | $5,420,840 |
| Pfizer, Inc. | COM | 717081103 | — | 165,000 shares | $4,705,800 |
| Generac Holdings | COM | 368736104 | — | 16,150 shares | $3,342,242 |
| Fiserv Inc. | COM | 337738108 | — | 62,449 shares | $2,821,446 |
| Ormat Technologies | COM | 686688102 | — | 26,100 shares | $2,387,889 |
| Viper Energy Inc | COM | 64361Q101 | — | 7,700 shares | $307,153 |
| ATHA Energy Corp. | COM | 046824108 | — | 118,000 shares | $79,797 |