Skip to main content
Livermore
Livermore
ZHEN

Dudley & Shanley, Inc.

SEC CIK
0000883511
Latest filing
Jul 9, 2026

The latest 13F from Dudley & Shanley, Inc. covers Q2 2026 (filed Jul 9, 2026): 37 long positions worth $662.3M. The top 10 holdings make up 49.8% of the portfolio, and the largest is Wheaton Precious Metals Corp. (WPM) at 7.7%. Livermore has 23 filings on Form 13F from this institution, going back to Q1 2021.

What changed in Q2 2026

Share counts compared with Q1 2026: how many positions were new, added to, reduced or sold out, and the biggest buys and sells. Dollar amounts are estimated at the quarter-end prices implied by the filing.

Full comparison
New
1
Est. +$3.97M
Added
15
Est. +$57.2M
Reduced
12
Est. −$33.8M
Sold out
1
Est. −$2.19M

Top 5 holdings

Share of this quarter's portfolio value

  1. WPMWheaton Precious Metals Corp.
    7.7%$51.1MHistory
  2. APHAmphenol Corp
    6.2%$41.3MHistory
  3. AMEAmetek Inc
    5.1%$33.8MHistory
  4. VVisa Inc.
    5.0%$33.3MHistory
  5. WSOWatsco Inc
    4.9%$32.5MHistory

Biggest buys

New and added positions, by estimated amount bought

  1. FASTFastenal Co
    +$14.0MAddedHistory
  2. FSSFederal Signal Corp
    +$13.7MAddedHistory
  3. XYLXylem Inc.
    +$11.8MAddedHistory
  4. WSOWatsco Inc
    +$9.30MAddedHistory
  5. WATWaters Corp
    +$4.45MAddedHistory

Largest weight increases

New and added positions, by percentage points of the portfolio gained

  1. FSSFederal Signal Corp
    +2.17 pp1.1% → 3.3%History
  2. FASTFastenal Co
    +2.05 pp1.4% → 3.4%History
  3. XYLXylem Inc.
    +1.65 pp1.6% → 3.2%History
  4. WSOWatsco Inc
    +1.59 pp3.3% → 4.9%History
  5. WATWaters Corp
    +0.76 pp0.6% → 1.3%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. ADIAnalog Devices Inc
    −$11.1MReducedHistory
  2. BMIBadger Meter Inc
    −$8.78MReducedHistory
  3. DHRDanaher Corp
    −$7.78MReducedHistory
  4. Invesco Exchange Traded FD T46137V142
    −$2.19MSold out
  5. APHAmphenol Corp
    −$1.99MReducedHistory

Largest weight decreases

Reduced and sold-out positions, by percentage points of the portfolio lost

  1. WPMWheaton Precious Metals Corp.
    −2.14 pp9.8% → 7.7%History
  2. BMIBadger Meter Inc
    −1.63 pp3.0% → 1.4%History
  3. DHRDanaher Corp
    −1.43 pp3.6% → 2.1%History
  4. ADIAnalog Devices Inc
    −0.92 pp5.0% → 4.0%History
  5. FISVFiserv Inc
    −0.50 pp1.3% → 0.8%History

Metrics

13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.

Portfolio value
$662.3M
+$51.0M (+8.4%) vs. prior quarter
Positions
37
0 vs. prior quarter
Top 10 concentration
49.8%
Top 10 as share of value
Turnover
5.6%
Q2 2026, one quarter
Average holding period
15.2 quarters
Weighted by value

How these are calculated

  • Portfolio value: the market value of all long positions in the 13F, as reported at quarter end, excluding options.
  • Top 10 concentration: the combined value of the 10 largest positions as a share of portfolio value.
  • Turnover: the smaller of this quarter's estimated purchases and estimated sales, divided by the average of this and last quarter's portfolio value. Estimates multiply the change in shares by the quarter-end price implied by the filing (market value divided by shares); new positions use this quarter's value and sold-out positions last quarter's. Only positions reported in shares count, and it is not calculated when the previous quarter was not filed.
  • Average holding period: how many consecutive quarters each current position has been held (including this one; a quarter without the position or without a filing starts the count over), weighted by this quarter's value. Counting starts with the first 13F in Livermore (Q1 2021), so positions held before then are understated.

13F filings by quarter

22 quarters, going back to Q1 2021. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $662.3M (Q2 2026)

Q1 2021: $579.5MQ2 2021: $606.3MQ3 2021: $568.7MQ4 2021: $577.7MQ1 2022: $537.5MQ2 2022: $446.4MQ3 2022: $357.4MQ4 2022: $443.9MQ1 2023: $521.4MQ2 2023: $553.8MQ3 2023: $528.9MQ4 2023: $561.0MQ1 2024: $592.6MQ2 2024: $581.9MQ3 2024: $639.7MQ4 2024: $647.6MQ1 2025: $635.1MQ2 2025: $636.8MQ3 2025: $621.5MQ4 2025: $622.2MQ1 2026: $611.2MQ2 2026: $662.3M
Q1 2021Q2 2026
13F filings of Dudley & Shanley, Inc. by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 9, 202637$662.3MWPMAPHAMEvs. Q1 2026SEC
Q1 2026Apr 8, 202637$611.2MWPMAPHSCIvs. Q4 2025SEC
Q4 2025Jan 9, 202633$622.2MWPMAPHVvs. Q3 2025SEC
Q3 2025Oct 8, 202532$621.5MWPMAPHVvs. Q2 2025SEC
Q2 2025Jul 9, 202536$636.8MWPMAPHVvs. Q1 2025SEC
Q1 2025Apr 9, 202536$635.1MWPMAONFISVvs. Q4 2024SEC
Q4 2024Jan 3, 202537$647.6MWPMFISVAONvs. Q3 2024SEC
Q3 2024Dec 23, 202436$639.7MWPMFISVAONvs. Q2 2024SEC
Q2 2024Jul 9, 202436$581.9MWPMFISVAPHvs. Q1 2024SEC
Q1 2024Apr 19, 202436$592.6MWPMAONFISVvs. Q4 2023SEC
Q4 2023Jan 12, 202434$561.0MWPMPGRFISVvs. Q3 2023SEC
Q3 2023Oct 13, 202336$528.9MWPMAONPGRvs. Q2 2023SEC
Q2 2023Jul 21, 202337$553.8MWPMAONIRDMvs. Q1 2023SEC
Q1 2023Apr 13, 202336$521.4MWPMAONPGRvs. Q4 2022SEC
Q4 2022Jan 18, 2023Amended33$443.9MWPMTJXAONvs. Q3 2022SEC
Q3 2022Oct 18, 202227$357.4MWPMAONIRDMvs. Q2 2022SEC
Q2 2022Jul 14, 202233$446.4MWPMAONSCIvs. Q1 2022SEC
Q1 2022Apr 18, 202233$537.5MWPMAONBALLvs. Q4 2021SEC
Q4 2021Jan 18, 202236$577.7MWPMAVTRAONvs. Q3 2021SEC
Q3 2021Nov 5, 202131$568.7MWPMAVTRAONvs. Q2 2021SEC
Q2 2021Jul 12, 202131$606.3MWPMBMYAVTRvs. Q1 2021SEC
Q1 2021Apr 21, 202130$579.5MWPMAONBMY–SEC