ACK Asset Management LLC
13F Reported Value
ⓘ$856.3M
Holdings
21
Latest Filing
2026-06-30
Filing Quarter
Q2 2026
Portfolio Overview
ACK Asset Management LLC disclosed 21 positions worth $856.3M in its Form 13F-HR for Q2 2026, led by $WMS (ADVANCED DRAINAGE SYSTEMS, INC.) at 7.2% of the equity portfolio, followed by $HLIO and $LFUS. During the quarter the fund opened 7 new positions and exited 6 — including a new stake in $GTX and a full exit from $ROG. The portfolio is most concentrated in Industrials (35.2% of disclosed assets). All figures are sourced directly from ACK Asset Management LLC’s Form 13F-HR filing with the SEC under CIK 1510940.
AI Fund Analysis
DiversifyingSector Allocation
AUM History
Top Equity Holdings by Value
Quarterly Activity — Q2 2026
Click any card to unlockTop Holdings
- 63.1#656
Quality
$61.2M390,000 sh - 54.6#1,313
Quality
$60.8M681,000 sh - 51.6#1,518
Quality
$56.9M125,000 sh - —
Quality
$55.0M2,100,000 sh - 56.8
Quality
$54.3M1,500,000 sh - 59.9
Quality
$52.6M1,090,000 sh - 57.0
Quality
$49.5M220,000 sh - —
Quality
$43.2M1,500,000 sh - 51.3
Quality
$42.2M690,276 sh - 59.0
Quality
$40.1M135,000 sh
| Company | Quality | Value | Shares |
|---|---|---|---|
 ADVANCED DRAINAGE SYSTEMS, INC.$WMS | 63.1#656 | $61.2M | 390,000 |
 HELIOS TECHNOLOGIES, INC.$HLIO | 54.6#1,313 | $60.8M | 681,000 |
 LITTELFUSE INC /DE$LFUS | 51.6#1,518 | $56.9M | 125,000 |
 James Hardie Industries plc$JHX | — | $55.0M | 2,100,000 |
 Garrett Motion Inc.$GTX | 56.8 | $54.3M | 1,500,000 |
 Core & Main, Inc.$CNM | 59.9 | $52.6M | 1,090,000 |
 EAGLE MATERIALS INC$EXP | 57.0 | $49.5M | 220,000 |
 ATS Corp /ATS$ATS | — | $43.2M | 1,500,000 |
 ASTEC INDUSTRIES INC$ASTE | 51.3 | $42.2M | 690,276 |
 MATERION Corp$MTRN | 59.0 | $40.1M | 135,000 |
Unlock AI quality scores for every holding
32-signal composite ranking on each of ACK Asset Management LLC's 21 positions.
Showing top 10 of 21 holdings.
Sector Allocation
Industrials
$301.5M
Materials
$202.3M
Technology
$156.8M
Consumer Discretionary
$128.4M
Energy
$38.9M
Other
$28.5M
Full Holdings — ACK Asset Management LLC (Q2 2026)
All 21 disclosed positions from the latest Form 13F-HR, with quarter-over-quarter share changes and 13F Pro quality scores. Sourced from SEC EDGAR.
| # | Ticker | Company | Value | Weight | QoQ | Quality |
|---|---|---|---|---|---|---|
| 1 | $WMS | ADVANCED DRAINAGE SYSTEMS, INC. | $61.2M | 7.2% | +0% | 63.1 |
| 2 | $HLIO | HELIOS TECHNOLOGIES, INC. | $60.8M | 7.1% | -13% | 54.6 |
| 3 | $LFUS | LITTELFUSE INC /DE | $56.9M | 6.7% | -7% | 51.6 |
| 4 | $JHX | James Hardie Industries plc | $55.0M | 6.4% | +0% | — |
| 5 | $GTX | Garrett Motion Inc. | $54.3M | 6.3% | NEW | 56.8 |
| 6 | $CNM | Core & Main, Inc. | $52.6M | 6.1% | +21% | 59.9 |
| 7 | $EXP | EAGLE MATERIALS INC | $49.5M | 5.8% | +33% | 57 |
| 8 | $ATS | ATS Corp /ATS | $43.2M | 5.0% | -19% | — |
| 9 | $ASTE | ASTEC INDUSTRIES INC | $42.2M | 4.9% | -12% | 51.3 |
| 10 | $MTRN | MATERION Corp | $40.1M | 4.7% | -72% | 59 |
| 11 |  $BWA | BORGWARNER INC | $39.8M | 4.7% | NEW | 56 |
| 12 |  $DNOW | DNOW Inc. | $38.9M | 4.5% | NEW | 48.8 |
| 13 |  $MBC | MasterBrand, Inc. | $38.1M | 4.5% | +0% | 38.7 |
| 14 |  $SITE | SiteOne Landscape Supply, Inc. | $37.8M | 4.4% | +0% | 52.1 |
| 15 |  $SWIM | Latham Group, Inc. | $36.6M | 4.3% | +10% | 46 |
| 16 |  $CLFD | Clearfield, Inc. | $32.2M | 3.8% | +10% | 30.3 |
| 17 |  $ST | Sensata Technologies Holding plc | $28.6M | 3.3% | NEW | — |
| 18 | — | AERO-SWX - COM | $28.5M | 3.3% | +30% | — |
| 19 |  $SHLS | Shoals Technologies Group, Inc. | $22.3M | 2.6% | NEW | 44.5 |
| 20 |  $EQPT | EquipmentShare.com Inc | $20.9M | 2.4% | NEW | 52.4 |
| 21 |  $MEI | METHODE ELECTRONICS INC | $16.6M | 1.9% | NEW | 34.4 |
New Positions (7)
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