DUDLEY & SHANLEY, INC. Long-Term Concentrated

Location: Palm Beach, FL

CIK: 0000883511 · Show all filings

Period: Q1 2026 (← Previous) (Next →)

Filing Date: Apr 8, 2026

Total Value: $611M (100.0% shares, 0.0% debt)

Holdings (37)

WPM Wheaton Precious Mtls 9.8%

Value $60.18M Shares 459,385 Est. Cost $26.64 Unrealized +424.8%

APH Amphenol Corp. 5.1%

Value $31.05M Shares 245,751 Est. Cost $49.89 Unrealized +193.4%

SCI Service Corp. Int'l 5.0%

Value $30.33M Shares 367,633 Est. Cost $38.46 Unrealized +110.6%

ADI Analog Devices 5.0%

Value $30.26M Shares 95,121 Est. Cost $184.36 Unrealized +71.5%

AME Ametek Inc. 4.9%

Value $29.96M Shares 139,746 Est. Cost $125.21 Unrealized +78.3%

V Visa Inc. 4.8%

Value $29.37M Shares 97,166 Est. Cost $208.01 Unrealized +58.2%

— Aon plc 4.7%

Value $28.66M Shares 88,782 Est. Cost $172.84 Unrealized —

ECL Ecolab Inc. 4.6%

Value $27.93M Shares 105,008 Est. Cost $96.52 Unrealized +196.6%

ROL Rollins, Inc. 4.0%

Value $24.34M Shares 455,730 Est. Cost $39.72 Unrealized +55.7%

FERG Ferguson Enterprises 4.0%

Value $24.3M Shares 104,175 Est. Cost $206.45 Unrealized +21.6%

AWK Amer. Water Works 3.8%

Value $23.01M Shares 169,044 Est. Cost $136.82 Unrealized -5.8%

DCI Donaldson Co., Inc. 3.8%

Value $22.95M Shares 270,405 Est. Cost $72.73 Unrealized +40.1%

SCHW Charles Schwab 3.7%

Value $22.64M Shares 240,933 Est. Cost $65.84 Unrealized +52.1%

KAI Kadant Inc. 3.6%

Value $22.14M Shares 75,735 Est. Cost $303.58 Unrealized +6.7%

DHR Danaher Corp. 3.6%

Value $21.78M Shares 114,881 Est. Cost $171.58 Unrealized +30.9%

WSO Watsco, Inc. 3.3%

Value $20.26M Shares 55,692 Est. Cost $356.75 Unrealized +9.9%

ALSN Allison Transmission 3.2%

Value $19.27M Shares 164,597 Est. Cost $38.61 Unrealized +188.1%

BMI Badger Meter Inc 3.0%

Value $18.61M Shares 122,150 Est. Cost $173.97 Unrealized -7.0%

KRNT Kornit Digital 3.0%

Value $18.39M Shares 1,254,615 Est. Cost $17.63 Unrealized -17.3%

RYAN Ryan Specialty Hldngs 2.6%

Value $16.2M Shares 480,021 Est. Cost $38.70 Unrealized +20.5%

NXE NexGen Energy Ltd. 2.3%

Value $14.2M Shares 1,224,500 Est. Cost $1.31 Unrealized +808.2%

PGR Progressive Corp. 2.1%

Value $13.14M Shares 66,280 Est. Cost $68.01 Unrealized +203.9%

XYL Xylem Inc. 1.6%

Value $9.659M Shares 80,830 Est. Cost $136.45 Unrealized 0.0%

FAST Fastenal Co. 1.4%

Value $8.41M Shares 181,250 Est. Cost $44.18 Unrealized +0.2%

FISV Fiserv Inc. 1.3%

Value $8.031M Shares 143,923 Est. Cost $64.10 Unrealized -0.2%

FSS Federal Signal Corp 1.1%

Value $6.784M Shares 62,730 Est. Cost $115.16 Unrealized 0.0%

A Agilent Tech, Inc. 1.0%

Value $6.292M Shares 55,200 Est. Cost $132.85 Unrealized +1.4%

HEI HEICO Corp. 0.9%

Value $5.347M Shares 19,500 Est. Cost $167.85 Unrealized +101.9%

MSFT Microsoft Corp. 0.6%

Value $3.912M Shares 10,569 Est. Cost $90.57 Unrealized +379.8%

GNRC Generac Holdings 0.6%

Value $3.838M Shares 19,650 Est. Cost $113.74 Unrealized +61.0%

WAT Waters Corporation 0.6%

Value $3.49M Shares 11,720 Est. Cost $367.10 Unrealized 0.0%

ORA Ormat Technologies 0.5%

Value $3.134M Shares 28,000 Est. Cost $68.71 Unrealized +75.4%

PHO Invesco Water ETF 0.4%

Value $2.192M Shares 32,780 Est. Cost $53.35 Unrealized —

ROP Roper Technologies 0.1%

Value $708K Shares 2,000 Est. Cost $433.92 Unrealized -12.9%

VNOM Viper Energy Inc 0.1%

Value $362K Shares 7,700 Est. Cost $37.86 Unrealized +8.2%

STLNF Stallion Uranium Corp 0.0%

Value $60,628 Shares 180,000 Est. Cost $0.30 Unrealized —

SASKF ATHA Energy Corp. 0.0%

Value $43,779 Shares 74,500 Est. Cost $0.60 Unrealized 0.0%

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
WPM	Wheaton Precious Mtls	459,385	$60.18M	9.8%	$26.64	+424.8%	COM	962879102
APH	Amphenol Corp.	245,751	$31.05M	5.1%	$49.89	+193.4%	COM	032095101
SCI	Service Corp. Int'l	367,633	$30.33M	5.0%	$38.46	+110.6%	COM	817565104
ADI	Analog Devices	95,121	$30.26M	5.0%	$184.36	+71.5%	COM	032654105
AME	Ametek Inc.	139,746	$29.96M	4.9%	$125.21	+78.3%	COM	031100100
V	Visa Inc.	97,166	$29.37M	4.8%	$208.01	+58.2%	COM	92826C839
—	Aon plc	88,782	$28.66M	4.7%	$172.84	—	COM	g0403h108
ECL	Ecolab Inc.	105,008	$27.93M	4.6%	$96.52	+196.6%	COM	278865100
ROL	Rollins, Inc.	455,730	$24.34M	4.0%	$39.72	+55.7%	COM	775711104
FERG	Ferguson Enterprises	104,175	$24.3M	4.0%	$206.45	+21.6%	COM	31488V107
AWK	Amer. Water Works	169,044	$23.01M	3.8%	$136.82	-5.8%	COM	030420103
DCI	Donaldson Co., Inc.	270,405	$22.95M	3.8%	$72.73	+40.1%	COM	257651109
SCHW	Charles Schwab	240,933	$22.64M	3.7%	$65.84	+52.1%	COM	808513105
KAI	Kadant Inc.	75,735	$22.14M	3.6%	$303.58	+6.7%	COM	48282T104
DHR	Danaher Corp.	114,881	$21.78M	3.6%	$171.58	+30.9%	COM	235851102
WSO	Watsco, Inc.	55,692	$20.26M	3.3%	$356.75	+9.9%	COM	942622200
ALSN	Allison Transmission	164,597	$19.27M	3.2%	$38.61	+188.1%	COM	01973R101
BMI	Badger Meter Inc	122,150	$18.61M	3.0%	$173.97	-7.0%	COM	056525108
KRNT	Kornit Digital	1,254,615	$18.39M	3.0%	$17.63	-17.3%	COM	M6372Q113
RYAN	Ryan Specialty Hldngs	480,021	$16.2M	2.6%	$38.70	+20.5%	COM	78351F107
NXE	NexGen Energy Ltd.	1,224,500	$14.2M	2.3%	$1.31	+808.2%	COM	65340P106
PGR	Progressive Corp.	66,280	$13.14M	2.1%	$68.01	+203.9%	COM	743315103
XYL	Xylem Inc.	80,830	$9.659M	1.6%	$136.45	0.0%	COM	98419M100
FAST	Fastenal Co.	181,250	$8.41M	1.4%	$44.18	+0.2%	COM	311900104
FISV	Fiserv Inc.	143,923	$8.031M	1.3%	$64.10	-0.2%	COM	337738108
FSS	Federal Signal Corp	62,730	$6.784M	1.1%	$115.16	0.0%	COM	313855108
A	Agilent Tech, Inc.	55,200	$6.292M	1.0%	$132.85	+1.4%	COM	00846U101
HEI	HEICO Corp.	19,500	$5.347M	0.9%	$167.85	+101.9%	COM	422806109
MSFT	Microsoft Corp.	10,569	$3.912M	0.6%	$90.57	+379.8%	COM	594918104
GNRC	Generac Holdings	19,650	$3.838M	0.6%	$113.74	+61.0%	COM	368736104
WAT	Waters Corporation	11,720	$3.49M	0.6%	$367.10	0.0%	COM	941848103
ORA	Ormat Technologies	28,000	$3.134M	0.5%	$68.71	+75.4%	COM	686688102
PHO	Invesco Water ETF	32,780	$2.192M	0.4%	$53.35	—	COM	46137V142
ROP	Roper Technologies	2,000	$708K	0.1%	$433.92	-12.9%	COM	776696106
VNOM	Viper Energy Inc	7,700	$362K	0.1%	$37.86	+8.2%	COM	64361Q101
STLNF	Stallion Uranium Corp	180,000	$60,628	0.0%	$0.30	—	COM	852919208
SASKF	ATHA Energy Corp.	74,500	$43,779	0.0%	$0.60	0.0%	COM	046824108