ACK Asset Management LLC
Clone Performance
Jul 2023–Jul 2026 · vs SPYHypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.
Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.
Portfolio Concentration
19 tracked positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Portfolio Trend
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Industrials | 53.7% | $415,440,617 |
| Technology | 24.3% | $188,437,834 |
| Basic Materials | 18.0% | $139,713,070 |
| Consumer Cyclical | 4.0% | $30,747,000 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| MBC | MasterBrand, Inc. | +1,400,000 | 3,700,000 | $30,747,000 | |
| CLFD | Clearfield, Inc. | +110,000 | 735,200 | $19,460,744 | |
| ROG | Rogers Corp | +38,293 | 475,000 | $50,981,750 | |
| CDNL | Cardinal Infrastructure Group Inc. | +29,409 | 874,000 | $34,658,470 | |
| DXPE | Dxp Enterprises Inc | +20,000 | 260,000 | $36,329,800 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| GVA | Granite Construction Inc | −250,000 | 250,000 | $29,970,000 | |
| No positions match the current search. | |||||
Sold Out
Positions the filer fully exited| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| ENS | EnerSys | 304,324 | $44,659,547 | |
| ATRO | Astronics Corp | 597,469 | $32,406,712 | |
| AIN | Albany International Corp /De/ | 600,000 | $30,420,000 | |
| APOG | Apogee Enterprises, Inc. | 813,000 | $29,601,330 | |
| ERII | Energy Recovery, Inc. | 677,251 | $9,136,115 | |
| CTOS | Custom Truck One Source, Inc. | 800,136 | $4,608,783 | |
| No positions match the current search. | ||||
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| MTRN |
MATERION Corp
Basic Materials
|
Held | 474,800 | $68,679,820 | 8.87% | |
| WMS |
Advanced Drainage Systems, Inc.
Industrials
|
Held | 390,000 | $53,480,700 | 6.91% | |
| ATS |
ATS Corp /ATS
Industrials
|
Held | 1,846,196 | $52,062,727 | 6.72% | |
| ROG |
Rogers Corp
Technology
|
Added | 475,000 | $50,981,750 | 6.58% | |
| HLIO |
Helios Technologies, Inc.
Industrials
|
Held | 780,378 | $50,498,260 | 6.52% | |
| LFUS |
Littelfuse Inc /De
Technology
|
NEW | 135,000 | $45,812,250 | 5.92% | |
| CNM |
Core & Main, Inc.
Industrials
|
Held | 900,000 | $44,460,000 | 5.74% | |
| NOVT |
Novanta Inc
Technology
|
Held | 375,000 | $44,291,250 | 5.72% | |
| SITE |
SiteOne Landscape Supply, Inc.
Industrials
|
Held | 330,000 | $43,926,300 | 5.67% | |
| ASTE |
Astec Industries Inc
Industrials
|
Held | 786,500 | $42,345,160 | 5.47% | |
| JHX |
James Hardie Industries plc
Basic Materials
|
Held | 2,100,000 | $39,774,000 | 5.14% | |
| DXPE |
Dxp Enterprises Inc
Industrials
|
Added | 260,000 | $36,329,800 | 4.69% | |
| CDNL |
Cardinal Infrastructure Group Inc.
Industrials
|
Added | 874,000 | $34,658,470 | 4.48% | |
| EXP |
Eagle Materials Inc
Basic Materials
|
Held | 165,000 | $31,259,250 | 4.04% | |
| MBC |
MasterBrand, Inc.
Consumer Cyclical
|
Added | 3,700,000 | $30,747,000 | 3.97% | |
| GVA |
Granite Construction Inc
Industrials
|
Reduced | 250,000 | $29,970,000 | 3.87% | |
| CTS |
Cts Corp
Technology
|
NEW | 584,000 | $27,891,840 | 3.60% | |
| SWIM |
Latham Group, Inc.
Industrials
|
NEW | 5,160,000 | $27,709,200 | 3.58% | |
| CLFD |
Clearfield, Inc.
Technology
|
Added | 735,200 | $19,460,744 | 2.51% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.