DUDLEY & SHANLEY, INC.
Long book
$611.2M
Q1 2026
Positions
37
Top-10 weight
52%
concentration
Last quarter
+5.5%
SPY +14.8%
Turnover
11%
of book per quarter
Strategy in plain words
auto-generated from filingsDUDLEY & SHANLEY, INC. is a concentrated fundamental stock-picker, running a $611.2M US long book across 37 positions.
The portfolio is concentrated: the top 10 names carry 52% of the portfolio. Turnover is modest: positions are typically held for years. Current anchor positions: WHEATON PRECIOUS METALS CORP, AMPHENOL CORP-CL A, SERVICE CORP INTERNATIONAL, ANALOG DEVICES INC, AMETEK INC.
Over the last 9 quarters its long book ran on average 1.8pp per quarter behind the S&P 500, beating the index in 3 of 9 quarters. We rate its filings highest-signal: new buys here are worth attention.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-1.0%
Q2 2024
+10.4%
Q3 2024
-1.6%
Q4 2024
+3.9%
Q1 2025
+4.9%
Q2 2025
+2.6%
Q3 2025
+0.4%
Q4 2025
-1.1%
Q1 2026
+5.5%
Sector allocation
Technology 22%
Industrials 18%
Services media 15%
Financials 13%
Materials 12%
Consumer discretionary 9%
Other 5%
Utilities 4%
Long book by quarter
What does DUDLEY & own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| WPM WHEATON PRECIOUS METALS CORP | Materials | 459.4K | $60.2M | 9.8% | -31.3% |
| APH AMPHENOL CORP-CL A | Technology | 245.8K | $31.1M | 5.1% | -13.1% |
| SCI SERVICE CORP INTERNATIONAL | Services media | 367.6K | $30.3M | 5.0% | Held |
| ADI ANALOG DEVICES INC | Technology | 95.1K | $30.3M | 5.0% | -23.9% |
| AME AMETEK INC | Technology | 139.7K | $30.0M | 4.9% | 0.0% |
| V VISA INC-CLASS A SHARES | Services media | 97.2K | $29.4M | 4.8% | -0.1% |
| AON AON PLC-CLASS A | Financials | 88.8K | $28.7M | 4.7% | Held |
| ECL ECOLAB INC | Other | 105.0K | $27.9M | 4.6% | 0.0% |
| ROL ROLLINS INC | Services media | 455.7K | $24.3M | 4.0% | Held |
| FERG FERGUSON ENTERPRISES INC | Consumer discretionary | 104.2K | $24.3M | 4.0% | Held |
| AWK AMERICAN WATER WORKS CO INC | Utilities | 169.0K | $23.0M | 3.8% | Held |
| DCI DONALDSON CO INC | Industrials | 270.4K | $22.9M | 3.8% | Held |
| SCHW SCHWAB (CHARLES) CORP | Financials | 240.9K | $22.6M | 3.7% | Held |
| KAI KADANT INC | Industrials | 75.7K | $22.1M | 3.6% | +37.4% |
| DHR DANAHER CORP | Technology | 114.9K | $21.8M | 3.6% | Held |
| WSO WATSCO INC | Consumer discretionary | 55.7K | $20.3M | 3.3% | Held |
| ALSN ALLISON TRANSMISSION HOLDING | Industrials | 164.6K | $19.3M | 3.2% | Held |
| BMI BADGER METER INC | Technology | 122.2K | $18.6M | 3.0% | +47.7% |
| KRNT KORNIT DIGITAL LTD | Industrials | 1.3M | $18.4M | 3.0% | +39.1% |
| RYAN RYAN SPECIALTY HOLDINGS INC | Financials | 480.0K | $16.2M | 2.6% | +0.5% |
| NXE NEXGEN ENERGY LTD | Materials | 1.2M | $14.2M | 2.3% | -0.9% |
| PGR PROGRESSIVE CORP | Financials | 66.3K | $13.1M | 2.1% | Held |
| XYL XYLEM INC | Industrials | 80.8K | $9.7M | 1.6% | New |
| FAST FASTENAL CO | Consumer discretionary | 181.3K | $8.4M | 1.4% | +2435.0% |
| FISV FISERV INC | Services media | 143.9K | $8.0M | 1.3% | Held |
| FSS FEDERAL SIGNAL CORP | Industrials | 62.7K | $6.8M | 1.1% | New |
| A AGILENT TECHNOLOGIES INC | Healthcare | 55.2K | $6.3M | 1.0% | Held |
| HEI HEICO CORP | Industrials | 19.5K | $5.3M | 0.9% | Held |
| MSFT MICROSOFT CORP | Technology | 10.6K | $3.9M | 0.6% | Held |
| GNRC GENERAC HOLDINGS INC | Industrials | 19.6K | $3.8M | 0.6% | Held |
| WAT WATERS CORP | Healthcare | 11.7K | $3.5M | 0.6% | New |
| ORA ORMAT TECHNOLOGIES INC | Utilities | 28.0K | $3.1M | 0.5% | Held |
| ROP ROPER TECHNOLOGIES INC | Technology | 2.0K | $708K | 0.1% | -88.5% |
| VNOM VIPER ENERGY INC-CL A | Energy | 7.7K | $362K | 0.1% | Held |
| STLNF STALLION URANIUM CORP | — | 180.0K | $61K | 0.0% | +111.8% |
| SASKF ATHA ENERGY CORP | — | 74.5K | $44K | 0.0% | New |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 8, 2026 | 38 | $611.2M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Jan 9, 2026 | 34 | $622.2M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Oct 8, 2025 | 33 | $621.5M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 9, 2025 | 37 | $636.8M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | Apr 9, 2025 | 37 | $635.1M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Jan 3, 2025 | 38 | $647.6M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Dec 23, 2024 | 37 | $639.7M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Jul 9, 2024 | 37 | $581.9M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | Apr 19, 2024 | 37 | $592.6M | canonical | SEC ↗ |
Similar funds
Sanders Capital, LLCGATES FOUNDATION TRUSTEAGLE CAPITAL MANAGEMENT LLCWoodbridge Co LtdAlecta Tjanstepension OmsesidigtMubadala Investment Co PJSCH&H International Investment, LLCNewlands Management Operations LLCINVESTOR ABIndependent Franchise Partners LLPPineStone Asset Management Inc.Pentwater Capital Management LP