DUDLEY & SHANLEY, INC.
CIK 883511 · View on SEC EDGAR ↗
- Portfolio value
- $629.2M
- Positions
- 37
- As of
- June 30, 2026
Portfolio value QoQ: +10.0% 13F does not disclose cash
- Top 10 holdings weight
- 48.21%
- Top 25 holdings weight
- 92.53%
- Positions above 1%
- 28
- Effective number of positions
- 26.1
Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)
Turnover Q2 2026: 5.9% Est. buys $61,129,783 · sells $35,428,162
Median holding: 7.0 quarters Tracked Q4 2024–Q2 2026 · 82.2% still held
- New positions
- 1
- Increased
- 15
- Decreased
- 12
- Closed
- 1
On this page
- Performance vs S&P How this manager's 13F portfolio performed against the S&P 500.
- Sector breakdown How the portfolio splits across market sectors.
- Portfolio Every stock this institution reports holding, from its latest 13F.
- Biggest new bets Brand-new positions opened in the latest quarter.
- Top moves The biggest position increases and decreases this quarter.
- Exited positions Positions the manager fully sold out of last quarter.
Performance vs S&P 500
Annualized: +7.4%
Approximates a buy-and-hold portfolio built from quarterly SEC 13F snapshots. Excludes cash, short positions, options/derivatives, and non-13(f) securities — reflects the disclosed long-equity book only, not total fund AUM. SEC filing lag is up to 45 days; this is not a real-time-copyable timing.
Priceable coverage: 94.2% · Options excluded: 0.0%
Sector breakdown
Full portfolio 37 positions
| Type | Streak | 8Q trend | |||||
|---|---|---|---|---|---|---|---|
| APH Amphenol Corporation Common Stock | $41,338,400 | 6.57% | 234,451 | $10,287,761 | Down ×3 | ||
| AME AMETEK, Inc. | $33,806,518 | 5.37% | 139,731 | $3,850,565 | Down ×2 | ||
| V Visa Inc. | $33,269,780 | 5.29% | 96,971 | $3,902,328 | Down ×2 | ||
| WSO Watsco, Inc. Common Stock | $32,509,941 | 5.17% | 78,012 | $12,249,748 | Up ×1 | ||
| Unknown issuer (CUSIP: g0403h108) | $29,456,394 | 4.68% | 88,807 | $799,340 | Up ×1 | ||
| ECL Ecolab Inc. Common Stock | $29,168,517 | 4.64% | 104,693 | $1,234,289 | Down ×2 | ||
| SCI Service Corporation International Common Stock | $27,936,797 | 4.44% | 367,783 | $-2,396,602 | Up ×1 | ||
| ADI Analog Devices, Inc. - Common Stock | $26,689,824 | 4.24% | 67,200 | $-3,571,971 | Down ×2 | ||
| FERG Ferguson Enterprises Inc. Common Stock | $24,735,719 | 3.93% | 104,225 | $435,859 | Up ×1 | ||
| DCI Donaldson Company, Inc. Common Stock | $24,447,064 | 3.89% | 272,330 | $1,497,792 | Up ×1 | ||
| KAI Kadant Inc Common Stock | $23,798,209 | 3.78% | 75,735 | $1,657,082 | |||
| FAST Fastenal Company - Common Stock | $22,691,293 | 3.61% | 472,440 | $14,281,293 | Up ×2 | ||
| AWK American Water Works Company, Inc. Common Stock | $22,282,284 | 3.54% | 169,344 | $-722,914 | Up ×1 | ||
| SCHW Charles Schwab Corporation (The) Common Stock | $22,230,888 | 3.53% | 240,933 | $-411,995 | |||
| FSS Federal Signal Corporation Common Stock | $21,751,430 | 3.46% | 169,285 | $14,967,808 | Up ×1 | ||
| XYL Xylem Inc. Common Stock New | $21,401,920 | 3.40% | 181,050 | $11,742,735 | Up ×1 | ||
| ROL Rollins, Inc. Common Stock | $20,688,640 | 3.29% | 495,655 | $-3,651,899 | Up ×1 | ||
| KRNT Kornit Digital Ltd. - Ordinary Shares | $20,398,056 | 3.24% | 1,255,265 | $2,005,400 | Up ×2 | ||
| ALSN Allison Transmission Holdings, Inc. Common Stock | $18,606,271 | 2.96% | 165,037 | $-661,454 | Up ×1 | ||
| WPM Wheaton Precious Metals Corp Common Shares (Canada) | $18,028,259 | 2.87% | 160,508 | $-3,008,410 | Down ×2 | ||
| RYAN Ryan Specialty Holdings, Inc. Class A Common Stock | $17,563,913 | 2.79% | 465,146 | $1,368,004 | Down ×1 | ||
| PGR Progressive Corporation (The) Common Stock | $14,478,866 | 2.30% | 66,280 | $1,339,519 | |||
| DHR Danaher Corporation Common Stock | $14,100,092 | 2.24% | 74,024 | $-7,681,346 | Down ×1 | ||
| NXE Nexgen Energy Ltd. Common Shares | $11,507,445 | 1.83% | 1,225,500 | $-2,696,755 | Up ×1 | ||
| BMI Badger Meter, Inc. Common Stock | $9,347,940 | 1.49% | 63,000 | $-9,261,612 | Down ×1 | ||
| A Agilent Technologies, Inc. Common Stock | $9,231,685 | 1.47% | 69,500 | $2,939,989 | Up ×1 | ||
| WAT Waters Corporation Common Stock | $8,847,194 | 1.41% | 23,590 | $5,356,978 | Up ×1 | ||
| HEI Heico Corporation Common Stock | $6,945,705 | 1.10% | 19,500 | $1,598,805 | |||
| FISV Fiserv, Inc. - Common Stock | $5,422,870 | 0.86% | 110,558 | $-2,608,033 | Down ×1 | ||
| GNRC Generac Holdlings Inc. Common Stock | $4,728,881 | 0.75% | 16,150 | $890,647 | Down ×1 | ||
| PFE Pfizer, Inc. Common Stock | $3,973,200 | 0.63% | 165,000 | Up ×1 | |||
| MSFT Microsoft Corporation - Common Stock | $3,942,448 | 0.63% | 10,569 | $30,121 | |||
| ORA Ormat Technologies, Inc. Common Stock | $2,842,290 | 0.45% | 26,100 | $-291,470 | Down ×1 | ||
| ROP Roper Technologies, Inc. - Common Stock | $676,780 | 0.11% | 2,000 | $-30,940 | |||
| VNOM Viper Energy, Inc. - Class A Common Stock | $326,480 | 0.05% | 7,700 | $-35,343 | |||
| SASKF | $51,991 | 0.01% | 74,500 | $8,212 | |||
| STLNF | $25,377 | 0.00% | 180,000 | $-35,251 | |||
| No matches | |||||||
Biggest new bets
New positions opened this quarter, largest first.
| Security | Value | Shares | % of portfolio |
|---|---|---|---|
| PFE | $3,973,200 | 165,000 | 0.63% |
Top movers (QoQ)
Exited positions
Includes corporate events (mergers, delistings) — not all exits are sells
Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.