2026 Q1 Portfolio Activity
In 2026 Q1, DUDLEY & SHANLEY, INC. maintained a portfolio of 37 distinct positions. The most significant new addition was Xylem Inc., now representing 1.58% of the total fund value. They heavily accumulated shares in Fastenal Co., increasing the position by 2435.0%. The fund also reduced its exposure to Wheaton Precious Mtls by 31.3%.
Position History
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Total Positions
37
Quarter
2026 Q1
Top Holding
WPM (9.8%)
Top 10 Concentration
51.8%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-37 of 37
DUDLEY & SHANLEY, INC. Full Holdings List — 2026 Q1
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
WPM
Wheaton Preciou...
|
Basic Materials | 9.85% | 12.63% |
#1
Prev: #1
|
5.9 |
—
|
-209,220 | -31.3% |
P
S
|
459,385 | $60,184,029 |
$nan
nan%
|
2019 Q3 | 13F Filing | 2026-03-31 | 2026-04-08 | ||
|
APH
Amphenol Corp.
|
Technology | 5.08% | 6.14% |
#2
Prev: #2
|
4.0 |
—
|
-37,160 | -13.1% |
P
S
|
245,751 | $31,050,639 |
$49.88
+146.7%
|
2021 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | ||
|
SCI
Service Corp. I...
|
Consumer Cyclical | 4.96% | 4.61% |
#3
4
Prev: #7
|
4.0 |
—
|
no change | no change |
P
S
|
367,633 | $30,333,399 |
$33.72
+130.0%
|
2015 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | ||
|
ADI
Analog Devices
|
Technology | 4.95% | 5.45% |
#4
Prev: #4
|
2.5 |
—
|
-29,900 | -23.9% |
P
S
|
95,121 | $30,261,795 | 2016 Q3 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
AME
Ametek Inc.
|
Industrials | 4.90% | 4.61% |
#5
1
Prev: #6
|
3.0 |
—
|
-50 | -0.0% |
P
S
|
139,746 | $29,955,953 | 2018 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
V
Visa Inc.
|
Financial Services | 4.80% | 5.48% |
#6
3
Prev: #3
|
2.4 |
—
|
-50 | -0.1% |
P
S
|
97,166 | $29,367,452 | 2018 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
AON
Aon plc
|
Financial Services | 4.69% | 5.04% |
#7
2
Prev: #5
|
2.9 |
—
|
no change | no change |
P
S
|
88,782 | $28,657,054 | 2013 Q3 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
ECL
Ecolab Inc.
|
Basic Materials | 4.57% | 4.43% |
#8
Prev: #8
|
2.3 |
—
|
-50 | -0.0% |
P
S
|
105,008 | $27,934,228 | 2006 Q2 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
ROL
Rollins, Inc.
|
Consumer Cyclical | 3.98% | 4.40% |
#9
Prev: #9
|
2.6 |
—
|
no change | no change |
P
S
|
455,730 | $24,340,539 | 2008 Q2 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
FERG
Ferguson Enterp...
|
Industrials | 3.98% | 3.73% |
#10
4
Prev: #14
|
2.6 |
—
|
no change | no change |
P
S
|
104,175 | $24,299,860 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
AWK
Amer. Water Wor...
|
Utilities | 3.76% | 3.55% |
#11
4
Prev: #15
|
2.5 |
—
|
no change | no change |
P
S
|
169,044 | $23,005,198 | 2023 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
DCI
Donaldson Co., ...
|
Industrials | 3.75% | 3.85% |
#12
1
Prev: #13
|
2.5 |
—
|
no change | no change |
P
S
|
270,405 | $22,949,272 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
SCHW
Charles Schwab
|
Financial Services | 3.70% | 3.87% |
#13
1
Prev: #12
|
2.5 |
—
|
no change | no change |
P
S
|
240,933 | $22,642,883 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
KAI
Kadant Inc.
|
Industrials | 3.62% | 2.52% |
#14
4
Prev: #18
|
3.9 |
—
|
20,615 | 37.4% |
P
S
|
75,735 | $22,141,127 | 2021 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
DHR
Danaher Corp.
|
Healthcare | 3.56% | 4.23% |
#15
5
Prev: #10
|
2.4 |
—
|
no change | no change |
P
S
|
114,881 | $21,781,438 | 2020 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
WSO
Watsco, Inc.
|
Industrials | 3.31% | 3.02% |
#16
Prev: #16
|
2.3 |
—
|
no change | no change |
P
S
|
55,692 | $20,260,193 | 2014 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
ALSN
Allison Transmi...
|
Consumer Cyclical | 3.15% | 2.59% |
#17
Prev: #17
|
2.3 |
—
|
no change | no change |
P
S
|
164,597 | $19,267,725 | 2021 Q2 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
BMI
Badger Meter In...
|
Technology | 3.04% | 2.32% |
#18
2
Prev: #20
|
3.7 |
—
|
39,455 | 47.7% |
P
S
|
122,150 | $18,609,552 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
KRNT
Kornit Digital
|
Industrials | 3.01% | 2.08% |
#19
2
Prev: #21
|
3.7 |
—
|
352,655 | 39.1% |
P
S
|
1,254,615 | $18,392,656 | 2021 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
RYAN
Ryan Specialty ...
|
Financial Services | 2.65% | 3.96% |
#20
9
Prev: #11
|
1.6 |
—
|
2,350 | 0.5% |
P
S
|
480,021 | $16,195,909 | 2021 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
NXE
NexGen Energy L...
|
Energy | 2.32% | 1.83% |
#21
1
Prev: #22
|
1.4 |
—
|
-10,650 | -0.9% |
P
S
|
1,224,500 | $14,204,200 | 2014 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
PGR
Progressive Cor...
|
Financial Services | 2.15% | 2.43% |
#22
3
Prev: #19
|
1.9 |
—
|
no change | no change |
P
S
|
66,280 | $13,139,347 | 2019 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
XYL
Xylem Inc.
|
Industrials | 1.58% | — |
#23
Prev: #—
|
4.1 |
—
|
80,830 | — |
NEW
|
80,830 | $9,659,185 | 2013 Q2 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
FAST
Fastenal Co.
|
Industrials | 1.38% | 0.05% |
#24
8
Prev: #32
|
3.6 |
—
|
174,100 | 2435.0% |
P
S
|
181,250 | $8,410,000 | 2001 Q3 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
FISV
Fiserv Inc.
|
Unknown | 1.31% | 1.55% |
#25
2
Prev: #23
|
1.5 |
—
|
no change | no change |
P
S
|
143,923 | $8,030,903 | 2009 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
FSS
Federal Signal ...
|
Industrials | 1.11% | — |
#26
Prev: #—
|
3.9 |
—
|
62,730 | — |
NEW
|
62,730 | $6,783,622 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
A
Agilent Tech, I...
|
Healthcare | 1.03% | 1.21% |
#27
2
Prev: #25
|
1.4 |
—
|
no change | no change |
P
S
|
55,200 | $6,291,696 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
HEI
HEICO Corp.
|
Industrials | 0.87% | 1.01% |
#28
2
Prev: #26
|
1.3 |
—
|
no change | no change |
P
S
|
19,500 | $5,346,900 | 2021 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
MSFT
Microsoft Corp.
|
Technology | 0.64% | 0.82% |
#29
2
Prev: #27
|
1.3 |
—
|
no change | no change |
P
S
|
10,569 | $3,912,327 | 2008 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
GNRC
Generac Holding...
|
Industrials | 0.63% | 0.43% |
#30
1
Prev: #29
|
1.3 |
—
|
no change | no change |
P
S
|
19,650 | $3,838,234 | 2022 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
WAT
Waters Corporat...
|
Healthcare | 0.57% | — |
#31
Prev: #—
|
3.7 |
—
|
11,720 | — |
NEW
|
11,720 | $3,490,216 | 1999 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
ORA
Ormat Technolog...
|
Utilities | 0.51% | 0.50% |
#32
4
Prev: #28
|
1.2 |
—
|
no change | no change |
P
S
|
28,000 | $3,133,760 | 2018 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
PHO
Invesco Water E...
|
ETF | 0.36% | 0.37% |
#33
3
Prev: #30
|
1.1 |
—
|
no change | no change |
P
S
|
32,780 | $2,191,671 | 2023 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
ROP
Roper Technolog...
|
Technology | 0.12% | 1.25% |
#34
10
Prev: #24
|
0.0 |
—
|
-15,455 | -88.5% |
P
S
|
2,000 | $707,720 | 2018 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
VNOM
Viper Energy In...
|
Energy | 0.06% | 0.05% |
#35
4
Prev: #31
|
1.0 |
—
|
no change | no change |
P
S
|
7,700 | $361,823 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
STLNF
Stallion Uraniu...
|
Basic Materials | 0.01% | 0.00% |
#36
3
Prev: #33
|
3.0 |
—
|
95,000 | 111.8% |
P
S
|
180,000 | $60,628 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-04-08 | |||
|
SASKF
ATHA Energy Cor...
|
Energy | 0.01% | — |
#37
Prev: #—
|
3.5 |
—
|
74,500 | — |
NEW
|
74,500 | $43,779 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-04-08 |
Showing 1-37 of 37 holdings