2026 Q3 Portfolio Activity
In 2026 Q3, DUDLEY & SHANLEY, INC. maintained a portfolio of 38 distinct positions. The most significant new addition was Tyler Technologies, now representing 3.26% of the total fund value. They heavily accumulated shares in Roper Technologies, increasing the position by 2766.2%. Conversely, DUDLEY & SHANLEY, INC. completely exited their position in Rollins, Inc..
Position History
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Total Positions
38
Quarter
2026 Q3
Top Holding
WPM (9.0%)
Top 10 Concentration
46.4%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-38 of 38
DUDLEY & SHANLEY, INC. Full Holdings List — 2026 Q3
| 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 | 8.96% | 7.71% |
#1
Prev: #1
|
6.1 |
—
|
-33,232 | -7.3% |
P
S
|
421,408 | $56,350,678 | 2019 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
AME
Ametek Inc.
|
Industrials | 5.01% | 5.10% |
#2
1
Prev: #3
|
4.0 |
—
|
-12,488 | -8.9% |
P
S
|
127,243 | $31,521,908 | 2018 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
V
Visa Inc.
|
Financial Services | 4.82% | 5.02% |
#3
1
Prev: #4
|
3.4 |
—
|
-12,552 | -12.9% |
P
S
|
84,419 | $30,334,279 | 2018 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
ECL
Ecolab Inc.
|
Basic Materials | 4.32% | 4.40% |
#4
3
Prev: #7
|
2.7 |
—
|
-5,650 | -5.4% |
P
S
|
99,043 | $27,195,227 | 2006 Q2 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
SCI
Service Corp. I...
|
Consumer Cyclical | 4.14% | 4.22% |
#5
3
Prev: #8
|
2.7 |
—
|
-25,358 | -6.9% |
P
S
|
342,425 | $26,075,664 | 2015 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
APH
Amphenol Corp.
|
Technology | 4.12% | 6.24% |
#6
4
Prev: #2
|
4.1 |
—
|
73,377 | 31.3% |
P
S
|
307,828 | $25,949,900 | 2021 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
ADI
Analog Devices
|
Technology | 4.08% | 4.03% |
#7
2
Prev: #9
|
2.1 |
—
|
-2,561 | -3.8% |
P
S
|
64,639 | $25,642,938 | 2016 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
AON
Aon plc
|
Financial Services | 3.75% | 4.45% |
#8
2
Prev: #6
|
2.0 |
—
|
-3,605 | -4.1% |
P
S
|
85,202 | $23,581,358 | 2013 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
DCI
Donaldson Co., ...
|
Industrials | 3.60% | 3.69% |
#9
2
Prev: #11
|
1.9 |
—
|
-12,160 | -4.5% |
P
S
|
260,170 | $22,645,197 | 2024 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
FAST
Fastenal Co.
|
Industrials | 3.58% | 3.43% |
#10
3
Prev: #13
|
1.9 |
—
|
-17,500 | -3.7% |
P
S
|
454,940 | $22,533,178 | 2001 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
FERG
Ferguson Enterp...
|
Industrials | 3.54% | 3.73% |
#11
1
Prev: #10
|
1.9 |
—
|
-4,193 | -4.0% |
P
S
|
100,032 | $22,269,124 | 2024 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
PGR
Progressive Cor...
|
Financial Services | 3.43% | 2.19% |
#12
10
Prev: #22
|
4.4 |
—
|
37,872 | 57.1% |
P
S
|
104,152 | $21,591,751 | 2019 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
AWK
Amer. Water Wor...
|
Utilities | 3.30% | 3.36% |
#13
1
Prev: #14
|
1.8 |
—
|
-8,794 | -5.2% |
P
S
|
160,550 | $20,786,408 | 2023 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
SCHW
Charles Schwab
|
Financial Services | 3.29% | 3.36% |
#14
1
Prev: #15
|
1.8 |
—
|
-28,968 | -12.0% |
P
S
|
211,965 | $20,717,459 | 2024 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
TYL
Tyler Technolog...
|
Technology | 3.26% | — |
#15
Prev: #—
|
4.8 |
—
|
64,400 | — |
NEW
|
64,400 | $20,517,840 | 2026 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
ROP
Roper Technolog...
|
Technology | 3.18% | 0.10% |
#16
18
Prev: #34
|
4.3 |
—
|
55,325 | 2766.2% |
P
S
|
57,325 | $20,029,928 | 2018 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
ALSN
Allison Transmi...
|
Consumer Cyclical | 3.16% | 2.81% |
#17
3
Prev: #20
|
3.3 |
—
|
10,237 | 6.2% |
P
S
|
175,274 | $19,851,533 | 2021 Q2 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
KRNT
Kornit Digital
|
Industrials | 3.09% | 3.08% |
#18
1
Prev: #19
|
1.7 |
—
|
-86,720 | -6.9% |
P
S
|
1,168,545 | $19,421,218 | 2021 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
FSS
Federal Signal ...
|
Industrials | 3.06% | 3.28% |
#19
3
Prev: #16
|
1.7 |
—
|
4,765 | 2.8% |
P
S
|
174,050 | $19,282,999 | 2026 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
KAI
Kadant Inc.
|
Industrials | 3.03% | 3.59% |
#20
8
Prev: #12
|
1.7 |
—
|
-2,953 | -3.9% |
P
S
|
72,782 | $19,033,949 | 2021 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
XYL
Xylem Inc.
|
Industrials | 2.74% | 3.23% |
#21
4
Prev: #17
|
1.6 |
—
|
-10,740 | -5.9% |
P
S
|
170,310 | $17,247,294 | 2013 Q2 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
RYAN
Ryan Specialty ...
|
Financial Services | 2.74% | 2.65% |
#22
1
Prev: #21
|
1.6 |
—
|
743 | 0.2% |
P
S
|
465,889 | $17,237,893 | 2021 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
DHR
Danaher Corp.
|
Healthcare | 2.51% | 2.13% |
#23
Prev: #23
|
1.5 |
—
|
-2,829 | -3.8% |
P
S
|
71,195 | $15,773,252 | 2020 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
WSO
Watsco, Inc.
|
Industrials | 2.48% | 4.91% |
#24
19
Prev: #5
|
1.0 |
—
|
-26,447 | -33.9% |
P
S
|
51,565 | $15,608,210 | 2014 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
NXE
NexGen Energy L...
|
Energy | 1.78% | 1.74% |
#25
1
Prev: #24
|
1.7 |
—
|
no change | no change |
P
S
|
1,225,500 | $11,196,617 | 2014 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
A
Agilent Tech, I...
|
Healthcare | 1.77% | 1.39% |
#26
Prev: #26
|
1.2 |
—
|
-4,950 | -7.1% |
P
S
|
64,550 | $11,122,610 | 2024 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
BMI
Badger Meter In...
|
Technology | 1.66% | 1.41% |
#27
2
Prev: #25
|
3.2 |
—
|
21,600 | 34.3% |
P
S
|
84,600 | $10,451,484 | 2025 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
WAT
Waters Corporat...
|
Healthcare | 1.65% | 1.34% |
#28
1
Prev: #27
|
1.7 |
—
|
no change | no change |
P
S
|
23,590 | $10,365,210 | 1999 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
HEI
HEICO Corp.
|
Industrials | 0.92% | 1.05% |
#29
1
Prev: #28
|
0.9 |
—
|
-500 | -2.6% |
P
S
|
19,000 | $5,760,420 | 2021 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
MSFT
Microsoft Corp.
|
Technology | 0.86% | 0.60% |
#30
2
Prev: #32
|
1.3 |
—
|
no change | no change |
P
S
|
10,569 | $5,420,840 | 2008 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
PFE
Pfizer, Inc.
|
Healthcare | 0.75% | 0.60% |
#31
Prev: #31
|
1.3 |
—
|
no change | no change |
P
S
|
165,000 | $4,705,800 | 2021 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
GNRC
Generac Holding...
|
Industrials | 0.53% | 0.71% |
#32
2
Prev: #30
|
1.2 |
—
|
no change | no change |
P
S
|
16,150 | $3,342,242 | 2022 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
FISV
Fiserv Inc.
|
Unknown | 0.45% | 0.82% |
#33
4
Prev: #29
|
0.2 |
—
|
-48,109 | -43.5% |
P
S
|
62,449 | $2,821,446 | 2009 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
ORA
Ormat Technolog...
|
Utilities | 0.38% | 0.43% |
#34
1
Prev: #33
|
1.2 |
—
|
no change | no change |
P
S
|
26,100 | $2,387,889 | 2018 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
VNOM
Viper Energy In...
|
Energy | 0.05% | 0.05% |
#35
Prev: #35
|
1.0 |
—
|
no change | no change |
P
S
|
7,700 | $307,153 | 2025 Q4 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
SASKF
ATHA Energy Cor...
|
Energy | 0.01% | 0.01% |
#36
Prev: #36
|
3.0 |
—
|
43,500 | 58.4% |
P
S
|
118,000 | $79,797 | 2024 Q1 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
STLNF
Stallion Uraniu...
|
Basic Materials | 0.00% | 0.00% |
Sold All 😨
(Was: #37) |
0.0 |
—
|
-180,000 | -100.0% |
CLOSED
|
— | $— | 2025 Q3 | 13F Filing | 2026-09-30 | 2026-10-06 | |||
|
ROL
Rollins, Inc.
|
Consumer Cyclical | 0.00% | 3.12% |
Sold All 😨
(Was: #18) |
0.0 |
—
|
-495,655 | -100.0% |
CLOSED
|
— | $— | 2008 Q2 | 13F Filing | 2026-09-30 | 2026-10-06 |
Showing 1-38 of 38 holdings