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Dudley & Shanley, Inc. 13F Holdings & Recent Stock Buys (Q3 2026)
Dudley & Shanley, Inc.CIK: 0000883511
ContrarianQuality / disciplined sizingDiversified strategy
Total reported value
$629.2M
Reporting period: 2026-09-30 · Number of holdings: 37
DUDLEY & SHANLEY, INC. disclosed 37 holdings in its latest 13F filing for the period ending 2026-09-30, with total reported value of $629.2M and a quarterly turnover rate of 24.3%.
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Personality snowflake
- Concentration
- 15.39
- Portfolio Stability
- 24.31
- Momentum
- 0
- Sector conviction
- 55.58
- Diversification
- 72
- Sizing Uniformity
- 93.71
Dudley & Shanley, Inc.'s disclosed holdings carry a Herfindahl concentration index of 0.038 — mathematically equivalent to about 26 equally-sized positions, close to its 37 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 0.63), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govNew buy TYL
Sold out ROL
Add ROP
+2766.3% $19.4M
Trim WSO
-33.9% -$16.9M
Trim APH
+31.3% -$15.4M
Add WPM
-7.3% $5.3M
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
Showing top 36 holdings (of 37 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | WPM | Wheaton Precious Metals CORP | Stock-Materials | 8.96% | +1.25% | -7.31% | |
| 2 | AME | Ametek Inc | Stock-Industrials | 5.01% | -0.09% | -8.94% | |
| 3 | V | Visa Inc-class A Shares | Stock-Financials | 4.82% | -0.20% | -12.94% | |
| 4 | ECL | Ecolab Inc | Stock-Materials | 4.32% | -0.08% | -5.40% | |
| 5 | SCI | Service CORP International | Stock-Consumer Disc | 4.14% | -0.08% | -6.89% | |
| 6 | APH | Amphenol Corp-cl A | Stock-Tech | 4.12% | -2.12% | +31.30% | |
| 7 | ADI | Analog Devices Inc | Stock-Tech | 4.08% | +0.05% | -3.81% | |
| 8 | AON | Aon plc | Stock-Financials | 3.75% | -0.70% | -4.06% | |
| 9 | DCI | Donaldson Co Inc | Stock-Industrials | 3.60% | -0.09% | -4.47% | |
| 10 | FAST | Fastenal Co | Stock-Industrials | 3.58% | +0.15% | -3.70% | |
| 11 | FERG | Ferguson Enterprises Inc | Stock-Industrials | 3.54% | -0.19% | -4.02% | |
| 12 | PGR | Progressive CORP | Stock-Financials | 3.43% | +1.24% | +57.14% | |
| 13 | AWK | American Water Works Co Inc | Stock-Utilities | 3.30% | -0.06% | -5.19% | |
| 14 | SCHW | Schwab (charles) CORP | Stock-Financials | 3.29% | -0.07% | -12.02% | |
| 15 | TYL | Tyler Technologies Inc | Stock-Tech | 3.26% | +3.26% | NEW | |
| 16 | ROP | Roper Technologies Inc | Stock-Tech | 3.18% | +3.08% | +2766.25% | |
| 17 | ALSN | Allison Transmission Holding | Stock-Consumer Disc | 3.16% | +0.35% | +6.20% | |
| 18 | KRNT | Kornit Digital Ltd. | Stock-Other | 3.09% | +0.01% | -6.91% | |
| 19 | FSS | Federal Signal CORP | Stock-Industrials | 3.06% | -0.22% | +2.81% | |
| 20 | KAI | Kadant Inc | Stock-Other | 3.03% | -0.56% | -3.90% | |
| 21 | XYL | Xylem Inc | Stock-Industrials | 2.74% | -0.49% | -5.93% | |
| 22 | RYAN | Ryan Specialty Holdings Inc | Stock-Financials | 2.74% | +0.09% | +0.16% | |
| 23 | DHR | Danaher CORP | Stock-Healthcare | 2.51% | +0.38% | -3.82% | |
| 24 | WSO | Watsco Inc | Stock-Industrials | 2.48% | -2.43% | -33.90% | |
| 25 | NXE | Nexgen Energy LTD | Stock-Other | 1.78% | +0.04% | — | |
| 26 | A | Agilent Technologies Inc | Stock-Healthcare | 1.77% | +0.38% | -7.12% | |
| 27 | BMI | Badger Meter Inc | Stock-Tech | 1.66% | +0.25% | +34.29% | |
| 28 | WAT | Waters CORP | Stock-Healthcare | 1.65% | +0.31% | — | |
| 29 | HEI | Heico CORP | Stock-Industrials | 0.92% | -0.13% | -2.56% | |
| 30 | MSFT | Microsoft CORP | Stock-Tech | 0.86% | +0.26% | — | |
| 31 | PFE | Pfizer Inc | Stock-Healthcare | 0.75% | +0.15% | — | |
| 32 | GNRC | Generac Holdings Inc | Stock-Industrials | 0.53% | -0.18% | — | |
| 33 | FISV | Fiserv Inc | Stock-Other | 0.45% | -0.37% | -43.51% | |
| 34 | ORA | Ormat Technologies Inc | Stock-Utilities | 0.38% | -0.05% | — | |
| 35 | VNOM | Viper Energy Inc-cl A | Stock-Energy | 0.05% | — | — | |
| 36 | SASKF | Atha Energy CORP | Stock-Other | 0.01% | — | +58.39% |
Portfolio Performance
Performance for Q4 2026
+0.3%
Performance Last 4 Quarters
+7.7%
- Stdev
- +14%
- Beta
- +0.68
- Alpha
- -0.5%
- Max Drawdown
- -10.1%
- Annualized Perf
- +15.1%
- Batting Avg vs S&P
- +44.4%
- Sortino
- +1.77
- Stutzer
- +0.31
- Treynor
- +0.22
- Sterling
- +0.91
- Calmar
- +1.5
- Information Ratio
- -0.66
- Tracking Error
- +11.9%
- Stdev Down
- +8.5%
- Winning Months %
- +69.4%
- Losing Months %
- +30.6%
- Best 12 Months
- +36%
- Worst 12 Months
- +1.6%
- Efficiency Ratio
- +0.44
- Sharpe
- +1.08
- Stdev Sectors
- +8.7%
- Skewness
- -0.54
- Kurtosis
- +1.05
- Upside Potential
- +3.24
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q3 | 37 | $629.2M | 24 | ||
| 2026 Q2 | 38 | $662.3M | 22 | ||
| 2026 Q1 | 38 | $611.2M | 21 | ||
| 2025 Q4 | 34 | $622.2M | 15 | ||
| 2025 Q3 | 33 | $621.5M | 23 | ||
| 2025 Q2 | 37 | $636.8M | 0 | ||
| 2025 Q1 | 37 | $635.1M | 100 | ||
| 2024 Q4 | 38 | $647.6M | 0 | ||
| 2024 Q3 | 37 | $639.7M | 0 | ||
| 2024 Q2 | 37 | $581.9M | 0 | ||
| 2024 Q1 | 37 | $592.6M | 0 | ||
| 2023 Q4 | 35 | $561.0M | 0 | ||
| 2023 Q3 | 37 | $528.9M | 0 | ||
| 2023 Q2 | 38 | $553.8M | 0 | ||
| 2023 Q1 | 37 | $521.4M | 0 | ||
| 2022 Q4 | 34 | $443.9M | 0 | ||
| 2022 Q3 | 28 | $357.4M | 0 | ||
| 2022 Q2 | 34 | $446.4M | 0 | ||
| 2022 Q1 | 34 | $537.5M | 0 | ||
| 2021 Q4 | 37 | $577.7M | 0 | ||
| 2021 Q3 | 32 | $568.7M | 0 | ||
| 2021 Q2 | 32 | $606.3M | 100 | ||
| 2021 Q1 | 31 | $579.5M | 28 | ||
| 2020 Q4 | 30 | $543.4M | 42 | ||
| 2020 Q3 | 30 | $411.7M | 15 | ||
| 2020 Q2 | 23 | $361.4M | 36 | ||
| 2020 Q1 | 26 | $398.0M | 48 | ||
| 2019 Q4 | 24 | $443.5M | 33 | ||
| 2019 Q3 | 24 | $404.8M | 30 | ||
| 2019 Q2 | 26 | $414.3M | 33 | ||
| 2019 Q1 | 27 | $386.3M | 39 | ||
| 2018 Q4 | 31 | $399.5M | 36 | ||
| 2018 Q3 | 35 | $528.5M | 41 | ||
| 2018 Q2 | 37 | $515.9M | 26 | ||
| 2018 Q1 | 42 | $522.7M | 40 | ||
| 2017 Q4 | 28 | $445.2M | 22 | ||
| 2017 Q3 | 29 | $453.1M | 33 | ||
| 2017 Q2 | 30 | $485.4M | 7 | ||
| 2017 Q1 | 30 | $479.9M | 19 | ||
| 2016 Q4 | 34 | $469.6M | 11 | ||
| 2016 Q3 | 34 | $435.3M | 27 | ||
| 2016 Q2 | 31 | $438.5M | 12 | ||
| 2016 Q1 | 30 | $457.8M | 24 | ||
| 2015 Q4 | 29 | $451.9M | 13 | ||
| 2015 Q3 | 28 | $451.1M | 34 | ||
| 2015 Q2 | 27 | $503.5M | 15 | ||
| 2015 Q1 | 27 | $496.5M | 18 | ||
| 2014 Q4 | 27 | $497.3M | 26 | ||
| 2014 Q3 | 29 | $477.5M | 15 | ||
| 2014 Q2 | 27 | $496.5M | 23 | ||
| 2014 Q1 | 28 | $492.3M | 24 | ||
| 2013 Q4 | 31 | $515.4M | 11 | ||
| 2013 Q3 | 30 | $482.2M | 31 | ||
| 2013 Q2 | 32 | $429.1M | — |
💡
Data Source Notice: AlphaSMO is the web's most authoritative 13F / Inside Trader database. Institutional holdings and insider trades presented here are precisely computed to deliver accurate portfolio reporting.
Holding changes this quarter
Dudley & Shanley, Inc.'s most significant position changes for 2026-09-30: Sold out: Rollins Inc (ROL); New buy: Tyler Technologies Inc (TYL); Sold out: Stallion Uranium CORP (STLNF); Add: Roper Technologies Inc (ROP) — shares +2766.25%; Trim: Watsco Inc (WSO) — shares -33.90%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | TYL | Tyler Technologies Inc | +3.3% | NEW | New buy |
| 2 | ROP | Roper Technologies Inc | +3.1% | +2766.25% | Add |
| 3 | WPM | Wheaton Precious Metals CORP | +1.3% | -7.31% | Trim |
| 4 | PGR | Progressive CORP | +1.2% | +57.14% | Add |
| 5 | A | Agilent Technologies Inc | +0.4% | -7.12% | Trim |
| 6 | DHR | Danaher CORP | +0.4% | -3.82% | Trim |
| 7 | ALSN | Allison Transmission Holding | +0.4% | +6.20% | Add |
| 8 | WAT | Waters CORP | +0.3% | — | Unchanged |
| 9 | MSFT | Microsoft CORP | +0.3% | — | Unchanged |
| 10 | BMI | Badger Meter Inc | +0.3% | +34.29% | Add |
| 11 | PFE | Pfizer Inc | +0.2% | — | Unchanged |
| 12 | FAST | Fastenal Co | +0.2% | -3.70% | Trim |
| 13 | RYAN | Ryan Specialty Holdings Inc | +0.1% | +0.16% | Add |
| 14 | ADI | Analog Devices Inc | +0.1% | -3.81% | Trim |
| 15 | NXE | Nexgen Energy LTD | 0% | — | Unchanged |
| 16 | KRNT | Kornit Digital Ltd. | 0% | -6.91% | Trim |
| 17 | SASKF | Atha Energy CORP | — | +58.39% | Add |
| 18 | STLNF | Stallion Uranium CORP | — | EXIT | Sold out |
| 19 | VNOM | Viper Energy Inc-cl A | — | — | Unchanged |
| 20 | ORA | Ormat Technologies Inc | -0.1% | — | Unchanged |
| 21 | AWK | American Water Works Co Inc | -0.1% | -5.19% | Trim |
| 22 | SCHW | Schwab (charles) CORP | -0.1% | -12.02% | Trim |
| 23 | ECL | Ecolab Inc | -0.1% | -5.40% | Trim |
| 24 | SCI | Service CORP International | -0.1% | -6.89% | Trim |
| 25 | AME | Ametek Inc | -0.1% | -8.94% | Trim |
| 26 | DCI | Donaldson Co Inc | -0.1% | -4.47% | Trim |
| 27 | HEI | Heico CORP | -0.1% | -2.56% | Trim |
| 28 | GNRC | Generac Holdings Inc | -0.2% | — | Unchanged |
| 29 | FERG | Ferguson Enterprises Inc | -0.2% | -4.02% | Trim |
| 30 | V | Visa Inc-class A Shares | -0.2% | -12.94% | Trim |
| 31 | FSS | Federal Signal CORP | -0.2% | +2.81% | Add |
| 32 | FISV | Fiserv Inc | -0.4% | -43.51% | Trim |
| 33 | XYL | Xylem Inc | -0.5% | -5.93% | Trim |
| 34 | KAI | Kadant Inc | -0.6% | -3.90% | Trim |
| 35 | AON | Aon plc | -0.7% | -4.06% | Trim |
| 36 | APH | Amphenol Corp-cl A | -2.1% | +31.30% | Add |
| 37 | WSO | Watsco Inc | -2.4% | -33.90% | Trim |
| 38 | ROL | Rollins Inc | -3.1% | EXIT | Sold out |
Filing History
FAQ
What is Dudley & Shanley, Inc. and what type of investor is it?
Dudley & Shanley, Inc. is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-09-30), the firm manages a tracked equity portfolio valued at approximately $629.2M, spread across 37 disclosed positions.
What are Dudley & Shanley, Inc.'s largest equity positions?
Based on the latest 13F filing, Dudley & Shanley, Inc.'s top holdings by market value are:
1. Wheaton Precious Metals CORP (WPM) — $56.4M (9.0%)
2. Ametek Inc (AME) — $31.5M (5.0%)
3. Visa Inc-class A Shares (V) — $30.3M (4.8%)
4. Ecolab Inc (ECL) — $27.2M (4.3%)
5. Service CORP International (SCI) — $26.1M (4.1%)
What changes did Dudley & Shanley, Inc. make in its most recent portfolio filing?
In the latest reported quarter, Dudley & Shanley, Inc. made 31 notable position adjustments: 1 new positions were initiated, 8 existing holdings were added to, 20 positions were partially reduced, and 2 were completely exited. The largest of these moves: Sold out: Rollins Inc (ROL); New buy: Tyler Technologies Inc (TYL); Sold out: Stallion Uranium CORP (STLNF); Add: Roper Technologies Inc (ROP) — shares +2766.25%; Trim: Watsco Inc (WSO) — shares -33.90%
What sectors does Dudley & Shanley, Inc. focus on?
Dudley & Shanley, Inc. is concentrated in the following sectors based on its current disclosed equity portfolio:
• Industrials: 27.8%
• Financials: 19.7%
• Information Technology: 18.7%
• Materials: 14.5%
• Consumer Discretionary: 8.0%
• Health Care: 7.3%
Investment Profile
Dudley & Shanley, Inc. returned an annualized 15.1% over the trailing 36 months — underperforming the S&P 500 by 0.5 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 0.68 (less volatile than the market) and a 44% quarterly batting average against the index.
Its portfolio is broadly diversified and moderately active.
It has added to its PGR position over the past two quarters (+$8.5M, now $21.6M), while trimming FISV over the same stretch (-$5.2M, still holding $2.8M).
Peer Institutions
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Sector conviction53.1
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NR
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Total reported value
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HA
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Developer Access
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