Dudley & Shanley portfolio
Concentrated managerInvestment firmPortfolio as of Sep 30, 2026 (Q3 2026) · filed with the SEC on Oct 6, 2026 · data updated on Nov 5, 2026 · Q3 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Dudley & Shanley reported a $629M portfolio of 36 positions to the SEC as of the end of Q3 2026. Its largest positions are WPM, AME, V. During the quarter it opened Tyler Technologies and exited Rollins.
Sections with a free account
What changed this quarter
30 positions with a change (1 new, 6 added to, 21 trimmed, 2 sold). 8 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Rollins−3.1 ppof portfolioSold out3.1% → —
- Tyler Technologies+3.1 ppof portfolioNew— → 3.3%
- Roper Technologies+2,766%more sharesIncreased0.1% → 3.2%
- Amphenol−34%fewer sharesReduced6.2% → 4.1%
- Watsco−34%fewer sharesReduced4.9% → 2.5%
- Progressive+57%more sharesIncreased2.2% → 3.4%
- Visa−13%fewer sharesReduced5.0% → 4.8%
- Wheaton Precious Metals−7.3%fewer sharesReduced7.7% → 9.0%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- Wheaton Precious MetalsWPM9.0%
- AmetekAME5.0%
- VisaV4.8%
- EcolabECL4.3%
- Service Corporation InternationalSCI4.1%
- AmphenolAPH4.1%
- Analog DevicesADI4.1%
- AonAON3.7%
- DonaldsonDCI3.6%
- FastenalFAST3.6%
- Ferguson EnterprisesFERG3.5%
- ProgressivePGR3.4%
- American Water WorksAWK3.3%
- Charles SchwabSCHW3.3%
- Tyler TechnologiesTYL3.3%
“Since”: first quarter of the current run, unbroken until today. In the details, prices are the quarter-end prices of the quarters in which it added shares, per the 13F. The manager may have bought at any price within each quarter; the SEC only publishes the value at quarter end.
Portfolio by sector
- ● Industrials 32%
- ● Financials 18%
- ● Information Technology 17%
- ● Materials 13%
- ● Consumer Discretionary 7%
- ● Health Care 7%
- ● Utilities 4%
- ● Energy 2%
How its portfolio changed (8 quarters)
Q3 2026: 36
Q3 2026: 46%
Q3 2026: 9.5%
Traded turnover: the weight it bought plus the weight it sold in the quarter, divided by two, excluding price moves. The plain “turnover” in the header does include that effect. With a free account: the full history and sectors over time.
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Investment firm, per its Form ADV of Mar 5, 2026 (medium confidence).
The data, as reported: DUDLEY & SHANLEY, INC. (CRD 157515): 5.D assets by client type: high net worth 57%, pooled vehicles 35%, charities 8% (of $747M); 5.F 51 accounts, 0% non-discretionary; 5.D 51 clients, 45 individuals; no financial planning, adviser selection or non-discretionary assets: discretionary accounts
The type comes from a rule applied to that data. If it looks wrong, tell us.
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