Q3 2026 13F · SEC CIK 883511

Dudley & Shanley, Inc.

Wealth managerFiled 2026-10-06 for Q3 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $629.2M
Reported positions: 36
Top holdings a year, 3 yrs: +13.5%
Assets under management: $746.8M

Dudley & Shanley, Inc. is a wealth manager that reported 36 positions worth $629.2M in its Q3 2026 13F, filed 2026-10-06. Its largest holdings were Wheaton Precious Metals Corp (WPM, 9.0%), Ametek Inc (AME, 5.0%), Visa Inc (V, 4.8%). 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 36 positions.

Weights are shares of the filer's total reported 13F value, compared with Q2 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	Q2 2026	Shares	Share change	Reported value
WPMWheaton Precious Metals Corp	9.0%	7.7%	421,408	-7.3%	$56.4M
AMEAmetek Inc	5.0%	5.1%	127,243	-8.9%	$31.5M
VVisa Inc	4.8%	5.0%	84,419	-12.9%	$30.3M
ECLEcolab Inc	4.3%	4.4%	99,043	-5.4%	$27.2M
SCIService Corp Intl Com	4.1%	4.2%	342,425	-6.9%	$26.1M
APHAmphenol Corp	4.1%	6.2%	307,828	+31.3%	$25.9M
ADIAnalog Devices Inc	4.1%	4.0%	64,639	-3.8%	$25.6M
AONAon PLC	3.7%	4.4%	85,202	-4.1%	$23.6M
DCIDonaldson Inc	3.6%	3.7%	260,170	-4.5%	$22.6M
FASTFastenal Co	3.6%	3.4%	454,940	-3.7%	$22.5M
FERGFerguson Enterprises Inc Common Stock Ne	3.5%	3.7%	100,032	-4.0%	$22.3M
PGRProgressive Corp	3.4%	2.2%	104,152	+57.1%	$21.6M
AWKAmerican Wtr Wks Co Inc New Com	3.3%	3.4%	160,550	-5.2%	$20.8M
SCHWCharles Schwab Corp (the)	3.3%	3.4%	211,965	-12.0%	$20.7M
TYLTyler Technologies Inc	3.3%	New	64,400	—	$20.5M
ROPRoper Technologies Inc	3.2%	0.1%	57,325	+2766.3%	$20.0M
ALSNAllison Transmission Hldgs I	3.2%	2.8%	175,274	+6.2%	$19.9M
KRNTKornit Digital Ltd	3.1%	3.1%	1,168,545	-6.9%	$19.4M
FSSFederal Signal Corp	3.1%	3.3%	174,050	+2.8%	$19.3M
KAIKadant Inc	3.0%	3.6%	72,782	-3.9%	$19.0M
XYLXylem Inc	2.7%	3.2%	170,310	-5.9%	$17.2M
RYANRyan Specialty Holdings Inc	2.7%	2.7%	465,889	+0.2%	$17.2M
DHRDanaher Corp Del	2.5%	2.1%	71,195	-3.8%	$15.8M
WSOWatsco	2.5%	4.9%	51,565	-33.9%	$15.6M
NXENexgen Energy Limited (canada)	1.8%	1.7%	1,225,500	+0.0%	$11.2M
AAgilent Technologies Inc	1.8%	1.4%	64,550	-7.1%	$11.1M
BMIBadger Meter Inc	1.7%	1.4%	84,600	+34.3%	$10.5M
WATWaters Corp	1.6%	1.3%	23,590	+0.0%	$10.4M
HEIHeico Corp New	0.9%	1.0%	19,000	-2.6%	$5.8M
MSFTMicrosoft Corp	0.9%	0.6%	10,569	+0.0%	$5.4M
PFEPfizer Inc	0.7%	0.6%	165,000	+0.0%	$4.7M
GNRCGenerac Hldgs Inc	0.5%	0.7%	16,150	+0.0%	$3.3M
FISVFiserv Inc	0.4%	0.8%	62,449	-43.5%	$2.8M
ORAOrmat Technologies Inc	0.4%	0.4%	26,100	+0.0%	$2.4M
VNOMViper Energy Inc	0.0%	0.0%	7,700	+0.0%	$307K
SASKFATHA Energy Corp.	0.0%	0.0%	118,000	+58.4%	$80K

What Dudley & Shanley, Inc. bought and sold in Q3 2026, against Q2 2026.

Share counts compared with the Q2 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, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 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
Q3 2026	$629.2M	36
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

Questions about Dudley & Shanley, Inc.'s portfolio

What stocks does Dudley & Shanley, Inc. own?

Dudley & Shanley, Inc.'s latest 13F, for Q3 2026 and filed Oct 6, 2026, lists 36 positions worth $629.2M. The largest are Wheaton Precious Metals Corp (WPM) at 9.0%, Ametek Inc (AME) at 5.0%, Visa Inc (V) at 4.8%, Ecolab Inc (ECL) at 4.3% and Service Corp Intl Com (SCI) at 4.1%.

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

In Q3 2026, Dudley & Shanley, Inc. added a new position in Tyler Technologies Inc (TYL), Roper Technologies Inc (ROP) (+2766.3% shares), ATHA Energy Corp. (SASKF) (+58.4% shares) and Progressive Corp (PGR) (+57.1% shares), compared with its Q2 2026 filing.

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

In Q3 2026, Dudley & Shanley, Inc. sold all of Rollins Inc (ROL), sold all of Stallion Uranium Corp (STLNF), Fiserv Inc (FISV) (-43.5% shares), Watsco (WSO) (-33.9% shares) and Visa Inc (V) (-12.9% shares), compared with its Q2 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 Dec 31, 2026 is due by Feb 14, 2027; 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 $629.2M.