Institutional Manager · CIK 0000883511
DUDLEY & SHANLEY, INC.
PALM BEACH, FL · File #028-03037
Latest AUM
$622.2M
Positions
34
Top-10 Concentration
52.8%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-12
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| EXITED | Amdocs Ltd. | G02602103 | -246,539 | -$20.2M | $0 |
| NEW | Badger Meter Inc | BMI | +82,695 | +$14.4M | $0 |
| REDUCE | Wheaton Precious Mtls | WPM | -74,453 | -$8.7M | +$2.9M |
| ADD | Roper Technologies | ROP | +14,905 | +$6.6M | -$136,578 |
| ADD | Ferguson Enterprises | FERG | +28,675 | +$6.4M | -$147,225 |
| ADD | Watsco, Inc. | WSO-B | +16,322 | +$5.5M | -$2.7M |
| REDUCE | Kornit Digital | KRNT | -356,935 | -$5.1M | +$1.1M |
| REDUCE | Amphenol Corp. | 032095101 | -33,685 | -$4.6M | +$3.6M |
| REDUCE | Fiserv Inc. | FISV | -30,998 | -$2.1M | -$10.8M |
| ADD | Ryan Specialty Hldngs | RYAN | +15,750 | +$813,173 | -$2.2M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202534 pos · $622.2M
- 13F HOLDINGS REPORTQ/E Sep 202533 pos · $621.5M
- 13F HOLDINGS REPORTQ/E Jun 202537 pos · $636.8M
- 13F HOLDINGS REPORTQ/E Mar 202537 pos · $635.1M
- 13F HOLDINGS REPORTQ/E Dec 202438 pos · $647.6M
- 13F HOLDINGS REPORTQ/E Dec 202437 pos · $639.7M
- 13F HOLDINGS REPORTQ/E Jun 202437 pos · $581.9M
- 13F HOLDINGS REPORTQ/E Mar 202437 pos · $592.6M
- 13F HOLDINGS REPORTQ/E Dec 202337 pos · $528.9M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | Wheaton Precious Mtls | WPM | 435,807 | $51.2M | 8.23% |
| 2 | Amphenol Corp. | 032095101 | 282,911 | $38.2M | 6.14% |
| 3 | Visa Inc. | V | 97,216 | $34.1M | 5.48% |
| 4 | Analog Devices | ADI | 125,021 | $33.9M | 5.45% |
| 5 | Aon plc | AON | 88,782 | $31.3M | 5.04% |
| 6 | Ametek Inc. | AME | 139,796 | $28.7M | 4.61% |
| 7 | Service Corp. Int'l | 817565104 | 367,633 | $28.7M | 4.61% |
| 8 | Ecolab Inc. | ECL | 105,058 | $27.6M | 4.43% |
| 9 | Wheaton Precious Mtls | WPM | 232,798 | $27.4M | 4.40% |
| 10 | Rollins, Inc. | ROL | 455,730 | $27.4M | 4.40% |
| 11 | Danaher Corp. | 235851102 | 114,881 | $26.3M | 4.23% |
| 12 | Ryan Specialty Hldngs | RYAN | 477,671 | $24.7M | 3.96% |
| 13 | Charles Schwab | SCHW-PJ | 240,933 | $24.1M | 3.87% |
| 14 | Donaldson Co., Inc. | DCI | 270,405 | $24.0M | 3.85% |
| 15 | Ferguson Enterprises | FERG | 104,175 | $23.2M | 3.73% |
| 16 | Amer. Water Works | 030420103 | 169,044 | $22.1M | 3.55% |
| 17 | Watsco, Inc. | WSO-B | 55,692 | $18.8M | 3.02% |
| 18 | Allison Transmission | ALSN | 164,597 | $16.1M | 2.59% |
| 19 | Kadant Inc. | KAI | 55,120 | $15.7M | 2.52% |
| 20 | Progressive Corp. | 743315103 | 66,280 | $15.1M | 2.43% |