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AAM

ACK Asset Management Portfolio holdings

AUM $801M
1-Year Est. Return 60.42%
This Fund
S&P 500
This Quarter Est. Return
+25.41%
1 Year Est. Return
+60.42%
3 Year Est. Return
+99.73%
5 Year Est. Return
+138.79%
10 Year Est. Return
+1,118.13%
AUM
$761M
AUM Growth
+$152M
Cap. Flow
+$10.1M
Cap. Flow %
1.32%
Top 10 Hldgs %
65.98%
Holding
26
New
6
Increased
5
Reduced
9
Closed
5

Top Buys

Rank Stock Value
1
AIN icon
Albany International
AIN
+$38.8M
2
WMS icon
Advanced Drainage Systems
WMS
+$38.6M
3
RRX icon
Regal Rexnord
RRX
+$34.5M
4
GVA icon
Granite Construction
GVA
+$29.9M
5
SITE icon
SiteOne Landscape Supply
SITE
+$17.7M

Top Sells

Rank Stock Value
1
MTZ icon
MasTec
MTZ
+$48.6M
2
ROG icon
Rogers Corp
ROG
+$34.9M
3
DY icon
Dycom Industries
DY
+$31.1M
4
CECO icon
Ceco Environmental
CECO
+$27.4M
5
MBC icon
MasterBrand
MBC
+$17M

Sector Composition

Rank Sector Weight
1 Industrials 75.51%
2 Utilities 5.99%
3 Materials 5.47%
4 Consumer Discretionary 5.39%
5 Energy 4.08%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ATRO icon
1
Astronics
ATRO
$3.37B
$69M 9.06%
2,472,000
– –
ATS icon
2
ATS Corp
ATS
$2.62B
$58.9M 7.73%
1,846,196
-167,000
-8% -$4.57M
DY icon
3
Dycom Industries
DY
$12.4B
$54.9M 7.21%
224,700
-158,100
-41% -$31.1M
GVA icon
4
Granite Construction
GVA
$5.37B
$51M 6.69%
545,000
+354,300
+186% +$29.9M
ENS icon
5
EnerSys
ENS
$7.16B
$50.1M 6.58%
584,324
-40,000
-6% -$3.49M
MYRG icon
6
MYR Group
MYRG
$6.14B
$48.1M 6.32%
265,200
-13,900
-5% -$2.04M
CTRI icon
7
Centuri Holdings
CTRI
$2.74B
$45.6M 5.99%
2,032,000
+811,409
+66% +$15.9M
JBTM
8
JBT Marel
JBTM
$7B
$42.2M 5.54%
350,546
-19,254
-5% -$2.15M
MTRN icon
9
Materion
MTRN
$5.12B
$41.7M 5.47%
524,800
+65,600
+14% +$5.17M
AIN icon
10
Albany International
AIN
$2.1B
$41M 5.39%
+585,000
New +$38.8M
RRX icon
11
Regal Rexnord
RRX
$13.9B
$39.9M 5.24%
+275,000
New +$34.5M
WMS icon
12
Advanced Drainage Systems
WMS
$11B
$39.6M 5.2%
+345,000
New +$38.6M
MRC
13
DELISTED
MRC Global
MRC
$31.1M 4.08%
2,267,000
+702,000
+45% +$8.46M
SITE icon
14
SiteOne Landscape Supply
SITE
$4.53B
$30.2M 3.97%
250,000
+150,000
+150% +$17.7M
MIR icon
15
Mirion Technologies
MIR
$3.86B
$28.8M 3.78%
1,337,000
-281,356
-17% -$4.85M
CLFD icon
16
Clearfield
CLFD
$414M
$27.1M 3.56%
625,200
-62,000
-9% -$2.13M
MTZ icon
17
MasTec
MTZ
$26.6B
$21.3M 2.8%
125,000
-337,700
-73% -$48.6M
MTRX icon
18
Matrix Service
MTRX
$340M
$14.7M 1.93%
1,087,100
-97,000
-8% -$1.17M
NPKI
19
NPK International
NPKI
$1.21B
$10.4M 1.37%
+1,226,808
New +$8.99M
CTOS icon
20
Custom Truck One Source
CTOS
$2.33B
$9.26M 1.22%
+1,875,000
New +$8.08M
DXPE icon
21
DXP Enterprises
DXPE
$2.63B
$6.63M 0.87%
+75,600
New +$6.3M
CECO icon
22
Ceco Environmental
CECO
$4.71B
– –
-1,201,000
Closed -$27.4M
LASR icon
23
nLIGHT
LASR
$3.83B
– –
-754,000
Closed -$5.86M
MBC icon
24
MasterBrand
MBC
$1.1B
– –
-1,302,500
Closed -$17M
ROG icon
25
Rogers Corp
ROG
$2.33B
– –
-517,500
Closed -$34.9M

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ACK Asset Management's Q2 2025 Portfolio in Review

As of Q2 2025, ACK Asset Management held 26 positions worth $761M, up 25% from $609M the previous quarter. Its ten largest holdings account for 66% of the portfolio.

ACK Asset Management's Q2 2025 filing shows 6 new, 5 increased, 9 reduced and 5 closed positions. Its largest new stake was Albany International: 585,000 shares worth $41M. The largest sale was MasTec, an estimated $48.6M.

By sector, the portfolio is most concentrated in Industrials at 76% of assets, up from 72% a quarter earlier, followed by Utilities and Materials.

  • ACK Asset Management's largest Q2 2025 buy was Albany International: 585,000 shares worth $41M.
  • ACK Asset Management added most to Granite Construction in Q2 2025, an estimated $29.9M increase.
  • ACK Asset Management's biggest Q2 2025 reduction was MasTec, cutting an estimated $48.6M.
  • ACK Asset Management fully exited Rogers Corp in Q2 2025, selling an estimated $34.9M.
  • ACK Asset Management's ten largest holdings make up 66% of its $761M portfolio in Q2 2025.
  • ACK Asset Management opened 6 new positions and closed 5 in Q2 2025.
  • ACK Asset Management's portfolio value rose 25% quarter-over-quarter to $761M.

Based on ACK Asset Management's 13F filing for Q2 2025, filed 13 Aug 2025.