DUDLEY & SHANLEY, INC.
Filing Date
Global Rank
#2,064
/ 8,232
▲ 119
Top Industry
Specialty Industrial Machinery
17.8%
3Y Alpha vs SPY
-9.7%
Period ended 2 months ago
Filed Apr 8, 2026 · 2mo
25 quarters · since Mar 2020
Clone Performance
Jun 2023–Jun 2026 · vs SPYHypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.
Cloned portfolio
+37.4%
SPY
+76.5%
Annualised alpha
-9.7%
Max drawdown
−14.0%
Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.
Portfolio Concentration
35 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Top Position
9.9%
−2.8 pts
Top 5
29.9%
−5.0 pts
Top 10
52.0%
−5.3 pts
HHI
431
Diversified−75
Portfolio Trend
25 quarters · across all stocks
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Industrials | 28.2% | $172,036,999 |
| Financial Services | 18.1% | $110,002,642 |
| Basic Materials | 14.5% | $88,174,776 |
| Technology | 13.9% | $84,542,030 |
| Consumer Cyclical | 12.1% | $73,941,661 |
| Healthcare | 5.2% | $31,563,349 |
| Utilities | 4.3% | $26,138,957 |
| Energy | 2.4% | $14,566,023 |
| Unclassified | 1.3% | $8,030,903 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased
6 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| KRNT | Kornit Digital Ltd. | +352,655 | 1,254,615 | $18,392,655 | |
| FAST | Fastenal Co | +174,100 | 181,250 | $8,410,000 | |
| STLNF | Stallion Uranium Corp. | +95,000 | 180,000 | $56,520 | |
| BMI | Badger Meter Inc | +39,455 | 122,150 | $18,609,552 | |
| KAI | Kadant Inc | +20,615 | 75,735 | $22,141,127 | |
| RYAN | Ryan Specialty Holdings, Inc. | +2,350 | 480,021 | $16,195,908 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced
8 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| WPM | Wheaton Precious Metals Corp. | −209,220 | 459,385 | $60,184,028 | |
| APH | Amphenol Corp /De/ | −37,160 | 245,751 | $31,050,638 | |
| ADI | Analog Devices Inc | −29,900 | 95,121 | $30,261,794 | |
| ROP | Roper Technologies Inc | −15,455 | 2,000 | $707,720 | |
| NXE | NexGen Energy Ltd. | −10,650 | 1,224,500 | $14,204,200 | |
| V | Visa Inc. | −50 | 97,166 | $29,367,451 | |
| ECL | Ecolab Inc. | −50 | 105,008 | $27,934,228 | |
| AME | Ametek Inc/ | −50 | 139,746 | $29,955,952 | |
| No positions match the current search. | |||||
Sold Out
Positions the filer fully exitedNo qualifying positions this quarter.
35 positions ·
$608,997,340 total
· as of Mar 31, 2026
All sectors
Basic Materials
Consumer Cyclical
Energy
Financial Services
Healthcare
Industrials
Technology
Utilities
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| WPM |
Wheaton Precious Metals Corp.
Basic Materials
|
Reduced | 459,385 | $60,184,028 | 9.88% | |
| APH |
Amphenol Corp /De/
Technology
|
Reduced | 245,751 | $31,050,638 | 5.10% | |
| SCI |
Service Corp International
Consumer Cyclical
|
Held | 367,633 | $30,333,398 | 4.98% | |
| ADI |
Analog Devices Inc
Technology
|
Reduced | 95,121 | $30,261,794 | 4.97% | |
| AME |
Ametek Inc/
Industrials
|
Reduced | 139,746 | $29,955,952 | 4.92% | |
| V |
Visa Inc.
Financial Services
|
Reduced | 97,166 | $29,367,451 | 4.82% | |
| AON |
Aon plc
Financial Services
|
Held | 88,782 | $28,657,053 | 4.71% | |
| ECL |
Ecolab Inc.
Basic Materials
|
Reduced | 105,008 | $27,934,228 | 4.59% | |
| ROL |
Rollins Inc
Consumer Cyclical
|
Held | 455,730 | $24,340,539 | 4.00% | |
| FERG |
Ferguson Enterprises Inc. /DE/
Industrials
|
Held | 104,175 | $24,299,860 | 3.99% | |
| AWK |
American Water Works Company, Inc.
Utilities
|
Held | 169,044 | $23,005,197 | 3.78% | |
| DCI |
DONALDSON Co INC
Industrials
|
Held | 270,405 | $22,949,272 | 3.77% | |
| SCHW |
Schwab Charles Corp
Financial Services
|
Held | 240,933 | $22,642,883 | 3.72% | |
| KAI |
Kadant Inc
Industrials
|
Added | 75,735 | $22,141,127 | 3.64% | |
| DHR |
Danaher Corp /De/
Healthcare
|
Held | 114,881 | $21,781,437 | 3.58% | |
| WSO |
Watsco Inc
Industrials
|
Held | 55,692 | $20,260,192 | 3.33% | |
| ALSN |
Allison Transmission Holdings Inc
Consumer Cyclical
|
Held | 164,597 | $19,267,724 | 3.16% | |
| BMI |
Badger Meter Inc
Technology
|
Added | 122,150 | $18,609,552 | 3.06% | |
| KRNT |
Kornit Digital Ltd.
Industrials
|
Added | 1,254,615 | $18,392,655 | 3.02% | |
| RYAN |
Ryan Specialty Holdings, Inc.
Financial Services
|
Added | 480,021 | $16,195,908 | 2.66% | |
| NXE |
NexGen Energy Ltd.
Energy
|
Reduced | 1,224,500 | $14,204,200 | 2.33% | |
| PGR |
Progressive Corp/Oh/
Financial Services
|
Held | 66,280 | $13,139,347 | 2.16% | |
| XYL |
Xylem Inc.
Industrials
|
NEW | 80,830 | $9,659,185 | 1.59% | |
| FAST |
Fastenal Co
Industrials
|
Added | 181,250 | $8,410,000 | 1.38% | |
| FISV |
Fiserv Inc
|
Held | 143,923 | $8,030,903 | 1.32% | |
| FSS |
Federal Signal Corp /De/
Industrials
|
NEW | 62,730 | $6,783,622 | 1.11% | |
| A |
Agilent Technologies, Inc.
Healthcare
|
Held | 55,200 | $6,291,696 | 1.03% | |
| HEI |
Heico Corp
Industrials
|
Held | 19,500 | $5,346,900 | 0.88% | |
| MSFT |
Microsoft Corp
Technology
|
Held | 10,569 | $3,912,326 | 0.64% | |
| GNRC |
Generac Holdings Inc.
Industrials
|
Held | 19,650 | $3,838,234 | 0.63% | |
| WAT |
Waters Corp /De/
Healthcare
|
NEW | 11,720 | $3,490,216 | 0.57% | |
| ORA |
Ormat Technologies, Inc.
Utilities
|
Held | 28,000 | $3,133,760 | 0.51% | |
| ROP |
Roper Technologies Inc
Technology
|
Reduced | 2,000 | $707,720 | 0.12% | |
| VNOM |
Viper Energy, Inc.
Energy
|
Held | 7,700 | $361,823 | 0.06% | |
| STLNF |
Stallion Uranium Corp.
Basic Materials
|
Added | 180,000 | $56,520 | 0.01% |