CIK: 0000883511
Total reported value
$662.3M
Reporting period: 2026-06-30 · Number of holdings: 38
DUDLEY & SHANLEY, INC. disclosed 38 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $662.3M and a quarterly turnover rate of 22.3%.
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Dudley & Shanley, INC.'s disclosed holdings carry a Herfindahl concentration index of 0.040 — mathematically equivalent to about 25 equally-sized positions, close to its 38 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.70), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
Recent activity leans toward adding more aggressively to already-large existing positions than to newly initiated ones (a 2.2 percentage-point tilt) — a pattern consistent with a momentum-following approach.
Add FSS
+169.9% $15.0M
Trim WPM
-1.0% -$9.1M
Add FAST
+160.7% $14.3M
Add XYL
+124.0% $11.7M
Trim BMI
-48.4% -$9.3M
Add WSO
+40.1% $12.2M
Showing top 37 holdings (of 38 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | WPM | Wheaton Precious Metals CORP | Stock-Materials | 7.71% | -2.14% | -1.03% | |
| 2 | APH | Amphenol Corp-cl A | Stock-Tech | 6.24% | +1.16% | -4.60% | |
| 3 | AME | Ametek INC | Stock-Industrials | 5.10% | +0.20% | -0.01% | |
| 4 | V | Visa Inc-class A Shares | Stock-Financials | 5.02% | +0.22% | -0.20% | |
| 5 | WSO | Watsco INC | Stock-Industrials | 4.91% | +1.60% | +40.08% | |
| 6 | ✓ | Aon plc | Stock-Other | 4.45% | -0.24% | +0.03% | |
| 7 | ECL | Ecolab INC | Stock-Materials | 4.40% | -0.17% | -0.30% | |
| 8 | SCI | Service CORP International | Stock-Consumer Disc | 4.22% | -0.74% | +0.04% | |
| 9 | ADI | Analog Devices INC | Stock-Tech | 4.03% | -0.92% | -29.35% | |
| 10 | FERG | Ferguson Enterprises INC | Stock-Industrials | 3.73% | -0.25% | +0.05% | |
| 11 | DCI | Donaldson Co INC | Stock-Industrials | 3.69% | -0.06% | +0.71% | |
| 12 | KAI | Kadant INC | Stock-Other | 3.59% | -0.03% | — | |
| 13 | FAST | Fastenal Co | Stock-Industrials | 3.43% | +2.05% | +160.66% | |
| 14 | AWK | American Water Works Co INC | Stock-Utilities | 3.36% | -0.40% | +0.18% | |
| 15 | SCHW | Schwab (charles) CORP | Stock-Financials | 3.36% | -0.34% | — | |
| 16 | FSS | Federal Signal CORP | Stock-Industrials | 3.28% | +2.17% | +169.86% | |
| 17 | XYL | Xylem INC | Stock-Industrials | 3.23% | +1.65% | +123.99% | |
| 18 | ROL | Rollins INC | Stock-Consumer Disc | 3.12% | -0.86% | +8.76% | |
| 19 | KRNT | Kornit Digital Ltd. | Stock-Other | 3.08% | +0.07% | +0.05% | |
| 20 | ALSN | Allison Transmission Holding | Stock-Consumer Disc | 2.81% | -0.34% | +0.27% | |
| 21 | RYAN | Ryan Specialty Holdings INC | Stock-Financials | 2.65% | — | -3.10% | |
| 22 | PGR | Progressive CORP | Stock-Financials | 2.19% | +0.04% | — | |
| 23 | DHR | Danaher CORP | Stock-Healthcare | 2.13% | -1.43% | -35.56% | |
| 24 | NXE | Nexgen Energy LTD | Stock-Other | 1.74% | -0.58% | +0.08% | |
| 25 | BMI | Badger Meter INC | Stock-Tech | 1.41% | -1.63% | -48.42% | |
| 26 | A | Agilent Technologies INC | Stock-Healthcare | 1.39% | +0.36% | +25.91% | |
| 27 | WAT | Waters CORP | Stock-Healthcare | 1.34% | +0.77% | +101.28% | |
| 28 | HEI | Heico CORP | Stock-Industrials | 1.05% | +0.18% | — | |
| 29 | FISV | Fiserv INC | Stock-Other | 0.82% | -0.49% | -23.18% | |
| 30 | GNRC | Generac Holdings INC | Stock-Industrials | 0.71% | +0.08% | -17.81% | |
| 31 | PFE | Pfizer INC | Stock-Healthcare | 0.60% | +0.60% | NEW | |
| 32 | MSFT | Microsoft CORP | Stock-Tech | 0.60% | -0.04% | — | |
| 33 | ORA | Ormat Technologies INC | Stock-Utilities | 0.43% | -0.08% | -6.79% | |
| 34 | ROP | Roper Technologies INC | Stock-Tech | 0.10% | -0.02% | — | |
| 35 | VNOM | Viper Energy Inc-cl A | Stock-Energy | 0.05% | -0.01% | — | |
| 36 | SASKF | Atha Energy CORP | Stock-Other | 0.01% | — | — | |
| 37 | STLNF | Stallion Uranium CORP | Stock-Other | — | -0.01% | — |
Performance for Q3 2026
-0.5%
Performance Last 4 Quarters
+9.9%
Based on 86% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-06-30 | 38 | $662.3M | 22 | |
| 2026-03-31 | 38 | $611.2M | 21 | |
| 2025-12-31 | 34 | $622.2M | 15 | |
| 2025-09-30 | 33 | $621.5M | 23 | |
| 2025-06-30 | 37 | $636.8M | 0 | |
| 2025-03-31 | 37 | $635.1M | 100 | |
| 2024-12-31 | 38 | $647.6M | 0 | |
| 2024-09-30 | 37 | $639.7M | 0 | |
| 2024-06-30 | 37 | $581.9M | 0 | |
| 2024-03-31 | 37 | $592.6M | 0 | |
| 2023-12-31 | 35 | $561.0M | 0 | |
| 2023-09-30 | 37 | $528.9M | 0 | |
| 2023-06-30 | 38 | $553.8M | 0 | |
| 2023-03-31 | 37 | $521.4M | 0 | |
| 2022-12-31 | 34 | $443.9M | 0 | |
| 2022-09-30 | 28 | $357.4M | 0 | |
| 2022-06-30 | 34 | $446.4M | 0 | |
| 2022-03-31 | 34 | $537.5M | 0 | |
| 2021-12-31 | 37 | $577.7M | 0 | |
| 2021-09-30 | 32 | $568.7M | 0 | |
| 2021-06-30 | 32 | $606.3M | 100 | |
| 2021-03-31 | 31 | $579.5M | 28 | |
| 2020-12-31 | 30 | $543.4M | 42 | |
| 2020-09-30 | 30 | $411.7M | 15 | |
| 2020-06-30 | 23 | $361.4M | 36 | |
| 2020-03-31 | 26 | $398.0M | 48 | |
| 2019-12-31 | 24 | $443.5M | 33 | |
| 2019-09-30 | 24 | $404.8M | 30 | |
| 2019-06-30 | 26 | $414.3M | 33 | |
| 2019-03-31 | 27 | $386.3M | 39 | |
| 2018-12-31 | 31 | $399.5M | 36 | |
| 2018-09-30 | 35 | $528.5M | 41 | |
| 2018-06-30 | 37 | $515.9M | 26 | |
| 2018-03-31 | 42 | $522.7M | 40 | |
| 2017-12-31 | 28 | $445.2M | 22 | |
| 2017-09-30 | 29 | $453.1M | 33 | |
| 2017-06-30 | 30 | $485.4M | 7 | |
| 2017-03-31 | 30 | $479.9M | 19 | |
| 2016-12-31 | 34 | $469.6M | 11 | |
| 2016-09-30 | 34 | $435.3M | 27 | |
| 2016-06-30 | 31 | $438.5M | 12 | |
| 2016-03-31 | 30 | $457.8M | 24 | |
| 2015-12-31 | 29 | $451.9M | 13 | |
| 2015-09-30 | 28 | $451.1M | 34 | |
| 2015-06-30 | 27 | $503.5M | 15 | |
| 2015-03-31 | 27 | $496.5M | 18 | |
| 2014-12-31 | 27 | $497.3M | 26 | |
| 2014-09-30 | 29 | $477.5M | 15 | |
| 2014-06-30 | 27 | $496.5M | 23 | |
| 2014-03-31 | 28 | $492.3M | 24 | |
| 2013-12-31 | 31 | $515.4M | 11 | |
| 2013-09-30 | 30 | $482.2M | 31 | |
| 2013-06-30 | 32 | $429.1M | — |
Dudley & Shanley, INC.'s most significant position changes for 2026-06-30: New buy: Pfizer INC (PFE); Sold out: Invesco Water Resources ETF (PHO); Add: Federal Signal CORP (FSS) — shares +169.86%; Trim: Wheaton Precious Metals CORP (WPM) — shares -1.03%; Add: Fastenal Co (FAST) — shares +160.66%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | FSS | Federal Signal CORP | +2.2% | +169.86% | Add |
| 2 | FAST | Fastenal Co | +2.1% | +160.66% | Add |
| 3 | XYL | Xylem INC | +1.7% | +123.99% | Add |
| 4 | WSO | Watsco INC | +1.6% | +40.08% | Add |
| 5 | APH | Amphenol Corp-cl A | +1.2% | -4.60% | Trim |
| 6 | WAT | Waters CORP | +0.8% | +101.28% | Add |
| 7 | PFE | Pfizer INC | +0.6% | NEW | New buy |
| 8 | A | Agilent Technologies INC | +0.4% | +25.91% | Add |
| 9 | V | Visa Inc-class A Shares | +0.2% | -0.20% | Trim |
| 10 | AME | Ametek INC | +0.2% | -0.01% | Trim |
| 11 | HEI | Heico CORP | +0.2% | — | Unchanged |
| 12 | GNRC | Generac Holdings INC | +0.1% | -17.81% | Trim |
| 13 | KRNT | Kornit Digital Ltd. | +0.1% | +0.05% | Add |
| 14 | PGR | Progressive CORP | 0% | — | Unchanged |
| 15 | RYAN | Ryan Specialty Holdings INC | — | -3.10% | Trim |
| 16 | SASKF | Atha Energy CORP | — | — | Unchanged |
| 17 | VNOM | Viper Energy Inc-cl A | 0% | — | Unchanged |
| 18 | STLNF | Stallion Uranium CORP | 0% | — | Unchanged |
| 19 | ROP | Roper Technologies INC | 0% | — | Unchanged |
| 20 | KAI | Kadant INC | 0% | — | Unchanged |
| 21 | MSFT | Microsoft CORP | 0% | — | Unchanged |
| 22 | DCI | Donaldson Co INC | -0.1% | +0.71% | Add |
| 23 | ORA | Ormat Technologies INC | -0.1% | -6.79% | Trim |
| 24 | ECL | Ecolab INC | -0.2% | -0.30% | Trim |
| 25 | ✓ | Aon plc | -0.2% | +0.03% | Add |
| 26 | FERG | Ferguson Enterprises INC | -0.3% | +0.05% | Add |
| 27 | ALSN | Allison Transmission Holding | -0.3% | +0.27% | Add |
| 28 | SCHW | Schwab (charles) CORP | -0.3% | — | Unchanged |
| 29 | PHO | Invesco Water Resources ETF | -0.4% | EXIT | Sold out |
| 30 | AWK | American Water Works Co INC | -0.4% | +0.18% | Add |
| 31 | FISV | Fiserv INC | -0.5% | -23.18% | Trim |
| 32 | NXE | Nexgen Energy LTD | -0.6% | +0.08% | Add |
| 33 | SCI | Service CORP International | -0.7% | +0.04% | Add |
| 34 | ROL | Rollins INC | -0.9% | +8.76% | Add |
| 35 | ADI | Analog Devices INC | -0.9% | -29.35% | Trim |
| 36 | DHR | Danaher CORP | -1.4% | -35.56% | Trim |
| 37 | BMI | Badger Meter INC | -1.6% | -48.42% | Trim |
| 38 | WPM | Wheaton Precious Metals CORP | -2.1% | -1.03% | Trim |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-06-30 | 2026-07-09 | 13F-HR | View on EDGAR |
| 2026-03-31 | 2026-04-08 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-01-09 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-10-08 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-07-09 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-04-09 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-01-03 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-12-23 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-09 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-04-19 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-01-12 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-10-13 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-07-21 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-04-13 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-01-18 | Amendment | View on EDGAR |
| 2022-12-31 | 2023-01-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-10-18 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-07-14 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-04-18 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-01-18 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-05 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-07-12 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-04-21 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-01-20 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-03 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-07-21 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-04-20 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-01-17 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-10-15 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-07-10 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-04-15 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-01-15 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-10-29 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-07-20 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-04-25 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-01-22 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-10-17 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-07-14 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-04-24 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-01-23 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-02 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-07-29 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-04-22 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-01-27 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-10-20 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-07-09 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-04-23 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-01-29 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-17 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-07-24 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-04-17 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-01-15 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-10-16 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-07-29 | 13F-HR | View on EDGAR |
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