2026 Q1 Portfolio Activity
In 2026 Q1, ACK Asset Management LLC maintained a portfolio of 26 distinct positions. The most significant new addition was LFUS, now representing 5.72% of the total fund value. They heavily accumulated shares in JHX, increasing the position by 1256.1%. Conversely, ACK Asset Management LLC completely exited their position in ENS.
Position History
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Total Positions
26
Quarter
2026 Q1
Top Holding
MTRN (8.6%)
Top 10 Concentration
62.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-26 of 26
ACK Asset Management LLC 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
MTRN
MTRN
|
Basic Materials | 8.57% | 7.41% |
#1
Prev: #1
|
6.4 |
—
|
no change | no change |
P
S
|
474,800 | $68,679,820 |
$85.97
-12.6%
|
2012 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
WMS
WMS
|
Industrials | 6.68% | 7.09% |
#2
1
Prev: #3
|
5.2 |
—
|
no change | no change |
P
S
|
390,000 | $53,480,700 |
$24.40
+439.4%
|
2014 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
ATS
ATS
|
Industrials | 6.50% | 6.38% |
#3
1
Prev: #4
|
4.6 |
—
|
no change | no change |
P
S
|
1,846,196 | $52,062,727 |
$32.72
-2.4%
|
2022 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
ROG
ROG
|
Technology | 6.36% | 5.02% |
#4
7
Prev: #11
|
5.0 |
—
|
38,293 | 8.8% |
P
S
|
475,000 | $50,981,750 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
HLIO
HLIO
|
Industrials | 6.30% | 5.24% |
#5
4
Prev: #9
|
4.0 |
—
|
no change | no change |
P
S
|
780,378 | $50,498,260 | 2020 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
LFUS
LFUS
|
Technology | 5.72% | — |
#6
Prev: #—
|
5.8 |
—
|
135,000 | — |
NEW
|
135,000 | $45,812,250 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CNM
CNM
|
Industrials | 5.55% | 5.87% |
#7
2
Prev: #5
|
3.2 |
—
|
no change | no change |
P
S
|
900,000 | $44,460,000 | 2023 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
NOVT
NOVT
|
Technology | 5.53% | 5.60% |
#8
1
Prev: #7
|
3.2 |
—
|
no change | no change |
P
S
|
375,000 | $44,291,250 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
SITE
SITE
|
Industrials | 5.48% | 5.16% |
#9
1
Prev: #10
|
3.2 |
—
|
no change | no change |
P
S
|
330,000 | $43,926,300 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ASTE
ASTE
|
Industrials | 5.29% | 4.28% |
#10
3
Prev: #13
|
3.1 |
—
|
no change | no change |
P
S
|
786,500 | $42,345,160 | 2014 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
JHX
|
|
Unknown | 4.96% | 5.47% |
#11
3
Prev: #8
|
3.0 |
—
|
no change | no change |
P
S
|
2,100,000 | $39,774,000 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
DXPE
DXPE
|
Industrials | 4.53% | 3.31% |
#12
5
Prev: #17
|
3.8 |
—
|
20,000 | 8.3% |
P
S
|
260,000 | $36,329,800 | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CDNL
CDNL
|
Industrials | 4.33% | 2.56% |
#13
6
Prev: #19
|
2.2 |
—
|
29,409 | 3.5% |
P
S
|
874,000 | $34,658,470 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
EXP
EXP
|
Basic Materials | 3.90% | 4.28% |
#14
2
Prev: #12
|
2.6 |
—
|
no change | no change |
P
S
|
165,000 | $31,259,250 | 2015 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
MBC
MBC
|
Consumer Cyclical | 3.84% | 3.19% |
#15
3
Prev: #18
|
4.5 |
—
|
1,400,000 | 60.9% |
P
S
|
3,700,000 | $30,747,000 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
GVA
GVA
|
Industrials | 3.74% | 7.24% |
#16
14
Prev: #2
|
1.5 |
—
|
-250,000 | -50.0% |
P
S
|
250,000 | $29,970,000 | 2011 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CTS
CTS
|
Technology | 3.48% | — |
#17
Prev: #—
|
4.9 |
—
|
584,000 | — |
NEW
|
584,000 | $27,891,840 | 2022 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
SWIM
SWIM
|
Industrials | 3.46% | — |
#18
Prev: #—
|
4.9 |
—
|
5,160,000 | — |
NEW
|
5,160,000 | $27,709,200 | 2021 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
N/A
AERO-SWX
|
|
Unknown | 3.35% | 0.69% |
#19
3
Prev: #22
|
4.3 |
—
|
675,149 | 436.0% |
P
S
|
830,000 | $26,806,307 | — | 13F Filing | 2026-03-31 | 2026-05-15 | ||
|
CLFD
CLFD
|
Technology | 2.43% | 2.29% |
#20
Prev: #20
|
3.0 |
—
|
110,000 | 17.6% |
P
S
|
735,200 | $19,460,744 | 2023 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
CTOS
CTOS
|
Industrials | 0.00% | 0.58% |
Sold All 😨
(Was: #23) |
0.0 |
—
|
-800,136 | -100.0% |
CLOSED
|
— | $— | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ERII
ERII
|
Industrials | 0.00% | 1.15% |
Sold All 😨
(Was: #21) |
0.0 |
—
|
-677,251 | -100.0% |
CLOSED
|
— | $— | 2022 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
APOG
APOG
|
Industrials | 0.00% | 3.72% |
Sold All 😨
(Was: #16) |
0.0 |
—
|
-813,000 | -100.0% |
CLOSED
|
— | $— | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
AIN
AIN
|
Consumer Cyclical | 0.00% | 3.82% |
Sold All 😨
(Was: #15) |
0.0 |
—
|
-600,000 | -100.0% |
CLOSED
|
— | $— | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ATRO
ATRO
|
Industrials | 0.00% | 4.07% |
Sold All 😨
(Was: #14) |
0.0 |
—
|
-597,469 | -100.0% |
CLOSED
|
— | $— | 2013 Q3 | 13F Filing | 2026-03-31 | 2026-05-15 | |||
|
ENS
ENS
|
Industrials | 0.00% | 5.61% |
Sold All 😨
(Was: #6) |
0.0 |
—
|
-304,324 | -100.0% |
CLOSED
|
— | $— | 2011 Q4 | 13F Filing | 2026-03-31 | 2026-05-15 |
Showing 1-26 of 26 holdings