Filed: 5/15/2026ACC: 0001510940-26-000004
📋 What this filing means
ACK ASSET MANAGEMENT LLC filed this quarterly 13F‑HR report disclosing 20 equity positions with a total reported market value of $801.14M. This filing provides a transparent view of the manager's long equity holdings as of the quarter end.
20
Positions
$801.14M
Total AUM (reported)
21.15M
Total Shares
Allocation by class
COM$801.14M100.0%
Portfolio Concentration
Top 3$174.22M21.7%
4–10$322.31M40.2%
11–25$304.61M38.0%
Top 3 weight
21.7%
Top 10 weight
62.0%
Voting Authority Distribution
Total shares with voting rights: 21.15M
Sole
Full voting authority
21.15M
shares
% of voting shares100.0%
Shared
Joint voting authority
0.00
shares
% of voting shares0.0%
None
No voting authority
0.00
shares
% of voting shares0.0%
Investment Discretion (by position count)
Sole20
Shared0
Other0
Dominant voting typeSole · 100.0% of voting shares
Institutional Holdings20
Rows:
MTRN
SOLEShares474.80K
TypeSH
Market value$68.68M
8.57%
Sole
474.80K
Shared
0.00
None
0.00
WMS
SOLEShares390K
TypeSH
Market value$53.48M
6.68%
Sole
390K
Shared
0.00
None
0.00
ATS
SOLEShares1.85M
TypeSH
Market value$52.06M
6.50%
Sole
1.85M
Shared
0.00
None
0.00
ROG
SOLEShares475K
TypeSH
Market value$50.98M
6.36%
Sole
475K
Shared
0.00
None
0.00
HLIO
SOLEShares780.38K
TypeSH
Market value$50.50M
6.30%
Sole
780.38K
Shared
0.00
None
0.00
LFUS
SOLEShares135K
TypeSH
Market value$45.81M
5.72%
Sole
135K
Shared
0.00
None
0.00
CNM
SOLEShares900K
TypeSH
Market value$44.46M
5.55%
Sole
900K
Shared
0.00
None
0.00
NOVT
SOLEShares375K
TypeSH
Market value$44.29M
5.53%
Sole
375K
Shared
0.00
None
0.00
SITE
SOLEShares330K
TypeSH
Market value$43.93M
5.48%
Sole
330K
Shared
0.00
None
0.00
ASTE
SOLEShares786.50K
TypeSH
Market value$42.35M
5.29%
Sole
786.50K
Shared
0.00
None
0.00
JHX
SOLEShares2.10M
TypeSH
Market value$39.77M
4.96%
Sole
2.10M
Shared
0.00
None
0.00
DXPE
SOLEShares260K
TypeSH
Market value$36.33M
4.53%
Sole
260K
Shared
0.00
None
0.00
CDNL
SOLEShares874K
TypeSH
Market value$34.66M
4.33%
Sole
874K
Shared
0.00
None
0.00
EXP
SOLEShares165K
TypeSH
Market value$31.26M
3.90%
Sole
165K
Shared
0.00
None
0.00
MBC
SOLEShares3.70M
TypeSH
Market value$30.75M
3.84%
Sole
3.70M
Shared
0.00
None
0.00
GVA
SOLEShares250K
TypeSH
Market value$29.97M
3.74%
Sole
250K
Shared
0.00
None
0.00
CTS
SOLEShares584K
TypeSH
Market value$27.89M
3.48%
Sole
584K
Shared
0.00
None
0.00
SWIM
SOLEShares5.16M
TypeSH
Market value$27.71M
3.46%
Sole
5.16M
Shared
0.00
None
0.00
AERO-SWX
SOLEShares830K
TypeSH
Market value$26.81M
3.35%
Sole
830K
Shared
0.00
None
0.00
CLFD
SOLEShares735.20K
TypeSH
Market value$19.46M
2.43%
Sole
735.20K
Shared
0.00
None
0.00
| Issuer | Class | Shares | Type | Value / Portfolio % | Voting — Sole | Shared | None |
|---|---|---|---|---|---|---|---|
MTRNSOLE | COM | 474.80K | SH | $68.68M 8.57% | 474.80K | 0.00 | 0.00 |
WMSSOLE | COM | 390K | SH | $53.48M 6.68% | 390K | 0.00 | 0.00 |
ATSSOLE | COM | 1.85M | SH | $52.06M 6.50% | 1.85M | 0.00 | 0.00 |
ROGSOLE | COM | 475K | SH | $50.98M 6.36% | 475K | 0.00 | 0.00 |
HLIOSOLE | COM | 780.38K | SH | $50.50M 6.30% | 780.38K | 0.00 | 0.00 |
LFUSSOLE | COM | 135K | SH | $45.81M 5.72% | 135K | 0.00 | 0.00 |
CNMSOLE | COM | 900K | SH | $44.46M 5.55% | 900K | 0.00 | 0.00 |
NOVTSOLE | COM | 375K | SH | $44.29M 5.53% | 375K | 0.00 | 0.00 |
SITESOLE | COM | 330K | SH | $43.93M 5.48% | 330K | 0.00 | 0.00 |
ASTESOLE | COM | 786.50K | SH | $42.35M 5.29% | 786.50K | 0.00 | 0.00 |
JHXSOLE | COM | 2.10M | SH | $39.77M 4.96% | 2.10M | 0.00 | 0.00 |
DXPESOLE | COM | 260K | SH | $36.33M 4.53% | 260K | 0.00 | 0.00 |
CDNLSOLE | COM | 874K | SH | $34.66M 4.33% | 874K | 0.00 | 0.00 |
EXPSOLE | COM | 165K | SH | $31.26M 3.90% | 165K | 0.00 | 0.00 |
MBCSOLE | COM | 3.70M | SH | $30.75M 3.84% | 3.70M | 0.00 | 0.00 |
GVASOLE | COM | 250K | SH | $29.97M 3.74% | 250K | 0.00 | 0.00 |
CTSSOLE | COM | 584K | SH | $27.89M 3.48% | 584K | 0.00 | 0.00 |
SWIMSOLE | COM | 5.16M | SH | $27.71M 3.46% | 5.16M | 0.00 | 0.00 |
AERO-SWXSOLE | COM | 830K | SH | $26.81M 3.35% | 830K | 0.00 | 0.00 |
CLFDSOLE | COM | 735.20K | SH | $19.46M 2.43% | 735.20K | 0.00 | 0.00 |