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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
+9%
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
$801M
AUM Growth
+$4.39M
Cap. Flow
-$28.3M
Cap. Flow %
-3.53%
Top 10 Hldgs %
61.98%
Holding
26
New
3
Increased
6
Reduced
1
Closed
6

Top Buys

1
LFUS icon
Littelfuse
LFUS
+$43.8M
2
SWIM icon
Latham Group
SWIM
+$32.9M
3
CTS icon
CTS Corp
CTS
+$29.3M
4
MBC icon
MasterBrand
MBC
+$15.1M
5
ROG icon
Rogers Corp
ROG
+$3.94M

Top Sells

1
ENS icon
EnerSys
ENS
+$44.7M
2
ATRO icon
Astronics
ATRO
+$32.4M
3
GVA icon
Granite Construction
GVA
+$31.2M
4
AIN icon
Albany International
AIN
+$30.4M
5
APOG icon
Apogee Enterprises
APOG
+$29.6M

Sector Composition

1 Industrials 51.86%
2 Technology 23.52%
3 Materials 17.44%
4 Consumer Discretionary 3.84%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MTRN icon
1
Materion
MTRN
$5.1B
$68.7M 8.57%
474,800
– –
WMS icon
2
Advanced Drainage Systems
WMS
$11.3B
$53.5M 6.68%
390,000
– –
ATS icon
3
ATS Corp
ATS
$2.68B
$52.1M 6.5%
1,846,196
– –
ROG icon
4
Rogers Corp
ROG
$2.36B
$51M 6.36%
475,000
+38,293
+9% +$3.94M
HLIO icon
5
Helios Technologies
HLIO
$2.68B
$50.5M 6.3%
780,378
– –
LFUS icon
6
Littelfuse
LFUS
$10.1B
$45.8M 5.72%
+135,000
New +$43.8M
CNM icon
7
Core & Main
CNM
$8.47B
$44.5M 5.55%
900,000
– –
NOVT icon
8
Novanta
NOVT
$5.3B
$44.3M 5.53%
375,000
– –
SITE icon
9
SiteOne Landscape Supply
SITE
$4.6B
$43.9M 5.48%
330,000
– –
ASTE icon
10
Astec Industries
ASTE
$1.27B
$42.3M 5.29%
786,500
– –
JHX icon
11
James Hardie Industries
JHX
$15B
$39.8M 4.96%
2,100,000
– –
DXPE icon
12
DXP Enterprises
DXPE
$2.6B
$36.3M 4.53%
260,000
+20,000
+8% +$2.68M
CDNL
13
Cardinal Infrastructure Group
CDNL
$1.42B
$34.7M 4.33%
874,000
+29,409
+3% +$852K
EXP icon
14
Eagle Materials
EXP
$6.36B
$31.3M 3.9%
165,000
– –
MBC icon
15
MasterBrand
MBC
$1.11B
$30.7M 3.84%
3,700,000
+1,400,000
+61% +$15.1M
GVA icon
16
Granite Construction
GVA
$5.43B
$30M 3.74%
250,000
-250,000
-50% -$31.2M
CTS icon
17
CTS Corp
CTS
$1.7B
$27.9M 3.48%
+584,000
New +$29.3M
SWIM icon
18
Latham Group
SWIM
$692M
$27.7M 3.46%
+5,160,000
New +$32.9M
CLFD icon
19
Clearfield
CLFD
$416M
$19.5M 2.43%
735,200
+110,000
+18% +$3.35M
AIN icon
20
Albany International
AIN
$2.11B
– –
-600,000
Closed -$30.4M
APOG icon
21
Apogee Enterprises
APOG
$856M
– –
-813,000
Closed -$29.6M
ATRO icon
22
Astronics
ATRO
$3.32B
– –
-716,963
Closed -$32.4M
CTOS icon
23
Custom Truck One Source
CTOS
$2.35B
– –
-800,136
Closed -$4.61M
ENS icon
24
EnerSys
ENS
$7.17B
– –
-304,324
Closed -$44.7M
ERII icon
25
Energy Recovery
ERII
$444M
– –
-677,251
Closed -$9.14M

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LWM
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KWMG
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ACK Asset Management's Q1 2026 Portfolio in Review

As of Q1 2026, ACK Asset Management held 26 positions worth $801M, up 0.55% from $797M the previous quarter. Its ten largest holdings account for 62% of the portfolio.

ACK Asset Management withdrew a net $28.3M in Q1 2026, closing 6 positions and reducing 1 holding. Its most notable exit was EnerSys, an estimated $44.7M position sold in full.

By sector, the portfolio is most concentrated in Industrials at 52% of assets, down from 62% a quarter earlier, followed by Technology and Materials.

Against the trend, ACK Asset Management opened a new position in Littelfuse worth $45.8M.

  • ACK Asset Management's largest Q1 2026 buy was Littelfuse: 135,000 shares worth $45.8M.
  • ACK Asset Management added most to MasterBrand in Q1 2026, an estimated $15.1M increase.
  • ACK Asset Management's biggest Q1 2026 reduction was Granite Construction, cutting an estimated $31.2M.
  • ACK Asset Management fully exited EnerSys in Q1 2026, selling an estimated $44.7M.
  • ACK Asset Management's ten largest holdings make up 62% of its $801M portfolio in Q1 2026.
  • ACK Asset Management opened 3 new positions and closed 6 in Q1 2026.
  • ACK Asset Management's portfolio value rose 0.55% quarter-over-quarter to $801M.

Based on ACK Asset Management's 13F filing for Q1 2026, filed 15 May 2026.