Q2 2026 13F · SEC CIK 883511

Dudley & Shanley, Inc.

Wealth managerFiled 2026-07-09 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $662.3M
Reported positions: 37
Top holdings a year, 3 yrs: +13.5%
Assets under management: $746.8M

Dudley & Shanley, Inc. is a wealth manager that reported 37 positions worth $662.3M in its Q2 2026 13F, filed 2026-07-09. Its largest holdings were Wheaton Precious Metals (WPM, 7.7%), Amphenol Corp (APH, 6.2%), Ametek Inc (AME, 5.1%). A portfolio copying its top holdings returned 13.5% a year over the last 3 years, against 20.4% for the S&P 500.

Dudley & Shanley, Inc. holdings all 37 positions.

Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Dudley & Shanley, Inc. 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
WPMWheaton Precious Metals	7.7%	9.8%	454,640	-1.0%	$51.1M
APHAmphenol Corp	6.2%	5.1%	234,451	-4.6%	$41.3M
AMEAmetek Inc	5.1%	4.9%	139,731	-0.0%	$33.8M
VVisa Inc Com Cl A	5.0%	4.8%	96,971	-0.2%	$33.3M
WSOWatsco Inc	4.9%	3.3%	78,012	+40.1%	$32.5M
AONAon PLC	4.4%	4.7%	88,807	+0.0%	$29.5M
ECLEcolab Inc	4.4%	4.6%	104,693	-0.3%	$29.2M
SCIService Corp Intl	4.2%	5.0%	367,783	+0.0%	$27.9M
ADIAnalog Devices Inc	4.0%	5.0%	67,200	-29.4%	$26.7M
FERGFerguson Enterprises Inc	3.7%	4.0%	104,225	+0.0%	$24.7M
DCIDonaldson Inc	3.7%	3.8%	272,330	+0.7%	$24.4M
KAIKadant Inc Com	3.6%	3.6%	75,735	+0.0%	$23.8M
FASTFastenal Co	3.4%	1.4%	472,440	+160.7%	$22.7M
AWKAmerican Water Works Co. Inc.	3.4%	3.8%	169,344	+0.2%	$22.3M
SCHWSchwab Charles Corp	3.4%	3.7%	240,933	+0.0%	$22.2M
FSSFederal Signal Corp	3.3%	1.1%	169,285	+169.9%	$21.8M
XYLXylem Inc Ny	3.2%	1.6%	181,050	+124.0%	$21.4M
ROLRollins Inc	3.1%	4.0%	495,655	+8.8%	$20.7M
KRNTKornit Digital Ltd	3.1%	3.0%	1,255,265	+0.1%	$20.4M
ALSNAllison Transmission	2.8%	3.2%	165,037	+0.3%	$18.6M
RYANRyan Specialty Holdings Inc	2.7%	2.6%	465,146	-3.1%	$17.6M
PGRProgressive Corp.	2.2%	2.1%	66,280	+0.0%	$14.5M
DHRDanaher Corporation	2.1%	3.6%	74,024	-35.6%	$14.1M
NXENexgen Energy Ltd	1.7%	2.3%	1,225,500	+0.1%	$11.5M
BMIBadger Meter Inc	1.4%	3.0%	63,000	-48.4%	$9.3M
AAgilent Technologies Inc	1.4%	1.0%	69,500	+25.9%	$9.2M
WATWaters Corp.	1.3%	0.6%	23,590	+101.3%	$8.8M
HEIHeico Corp New	1.0%	0.9%	19,500	+0.0%	$6.9M
FISVFiserv Inc	0.8%	1.3%	110,558	-23.2%	$5.4M
GNRCGenerac Hldgs Inc	0.7%	0.6%	16,150	-17.8%	$4.7M
PFEPfizer Inc	0.6%	New	165,000	—	$4.0M
MSFTMicrosoft Corp	0.6%	0.6%	10,569	+0.0%	$3.9M
ORAOrmat Technologies Inc	0.4%	0.5%	26,100	-6.8%	$2.8M
ROPRoper Technologies Inc Com	0.1%	0.1%	2,000	+0.0%	$677K
VNOMViper Energy Inc	0.0%	0.1%	7,700	+0.0%	$326K
SASKFATHA Energy Corp.	0.0%	0.0%	74,500	+0.0%	$52K
STLNFStallion Uranium Corp	0.0%	0.0%	180,000	+0.0%	$25K

What Dudley & Shanley, Inc. bought and sold in Q2 2026, against Q1 2026.

New positions

PFE Pfizer Inc0.6% of 13F

Added to

FSS Federal Signal Corp+169.9% shares
FAST Fastenal Co+160.7% shares
XYL Xylem Inc Ny+124.0% shares
WAT Waters Corp.+101.3% shares
WSO Watsco Inc+40.1% shares
A Agilent Technologies Inc+25.9% shares
ROL Rollins Inc+8.8% shares

Reduced

Sold out

PHO Invesco Exchange Traded Fd Twas 0.4%

Share counts compared with the Q1 2026 13F; a split also changes share counts.

How the holdings did against the S&P 500.

1 year: +8.6% /yr; S&P 500 +20.1%
3 years: +13.5% /yr; S&P 500 +20.4%
5 years: +8.0% /yr; S&P 500 +11.6%

A portfolio of the filer's 20 largest 13F positions, weighted by value and rebuilt each quarter on the day the filing became public. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q2 2026	$662.3M	37
Q1 2026	$611.2M	37
Q4 2025	$622.2M	33
Q3 2025	$621.5M	32
Q2 2025	$636.8M	36
Q1 2025	$635.1M	36
Q4 2024	$647.6M	37
Q3 2024	$639.7M	36
Q2 2024	$581.9M	36
Q1 2024	$592.6M	36
Q4 2023	$561.0M	34
Q3 2023	$528.9M	36

Questions about Dudley & Shanley, Inc.'s portfolio

What stocks does Dudley & Shanley, Inc. own?

Dudley & Shanley, Inc.'s latest 13F, for Q2 2026 and filed Jul 9, 2026, lists 37 positions worth $662.3M. The largest are Wheaton Precious Metals (WPM) at 7.7%, Amphenol Corp (APH) at 6.2%, Ametek Inc (AME) at 5.1%, Visa Inc Com Cl A (V) at 5.0% and Watsco Inc (WSO) at 4.9%.

What did Dudley & Shanley, Inc. buy last quarter?

In Q2 2026, Dudley & Shanley, Inc. added a new position in Pfizer Inc (PFE), Federal Signal Corp (FSS) (+169.9% shares), Fastenal Co (FAST) (+160.7% shares) and Xylem Inc Ny (XYL) (+124.0% shares), compared with its Q1 2026 filing.

What did Dudley & Shanley, Inc. sell last quarter?

In Q2 2026, Dudley & Shanley, Inc. sold all of Invesco Exchange Traded Fd T (PHO), Badger Meter Inc (BMI) (-48.4% shares), Danaher Corporation (DHR) (-35.6% shares) and Analog Devices Inc (ADI) (-29.4% shares), compared with its Q1 2026 filing.

How has Dudley & Shanley, Inc.'s portfolio performed?

A portfolio copying Dudley & Shanley, Inc.'s 20 largest 13F holdings each quarter, from the day each filing was public, returned +13.5% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +8.6% against +20.1%. Over 5 years: +8.0% a year against +11.6%.

When is Dudley & Shanley, Inc.'s next 13F filing due?

13F filings are due 45 days after each quarter ends. Dudley & Shanley, Inc.'s filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.

How much money does Dudley & Shanley, Inc. manage?

Dudley & Shanley, Inc. reported $746.8M of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $662.3M.