Funds › ACK Asset Management LLC
ACK Asset Management LLC
13F for Q3 2026, filed Nov 13, 2026. 20 positions worth $666.8M.Managers with more than $100 million in US-listed stocks list their holdings each quarter, within 45 days of quarter end. Long positions only: no short sales or cash.
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Holdings, Q3 2026
Largest first. Common shares only.
| # | The fund's own figures at the end of the quarter. A report can be up to 45 days old when it is filed. Options and bonds are not counted here. | Filing | ||||
|---|---|---|---|---|---|---|
| 1 | JHX James Hardie Industries plc. | 2.10M | $53.2M | 8.0% | Unchanged | 13F ↗ |
| 2 | DNOW DNOW Inc. | 3.30M | $51.1M | 7.7% | +10.0% | 13F ↗ |
| 3 | WMS Advanced Drainage Systems, Inc. | 390,000 | $49.4M | 7.4% | Unchanged | 13F ↗ |
| 4 | LFUS Littelfuse, Inc. | 110,000 | $46.6M | 7.0% | -12.0% | 13F ↗ |
| 5 | HLIO Helios Technologies, Inc. | 681,000 | $46.3M | 6.9% | Unchanged | 13F ↗ |
| 6 | CNM Core & Main, Inc. | 1.09M | $45.2M | 6.8% | Unchanged | 13F ↗ |
| 7 | DY Dycom Industries, Inc. | 160,000 | $43.1M | 6.5% | New | 13F ↗ |
| 8 | GTX Garrett Motion Inc. | 1.60M | $41.6M | 6.2% | +6.7% | 13F ↗ |
| 9 | EXP Eagle Materials Inc | 220,000 | $37.6M | 5.6% | Unchanged | 13F ↗ |
| 10 | BWA BorgWarner Inc. | 600,000 | $36.1M | 5.4% | Unchanged | 13F ↗ |
| 11 | SWIM Latham Group, Inc. | 5.66M | $35.3M | 5.3% | Unchanged | 13F ↗ |
| 12 | ST Sensata Technologies Holding plc | 700,000 | $29.1M | 4.4% | +16.7% | 13F ↗ |
| 13 | CTRI Centuri Holdings, Inc. | 1.40M | $28.1M | 4.2% | New | 13F ↗ |
| 14 | MBC MasterBrand, Inc. | 3.90M | $27.3M | 4.1% | +5.4% | 13F ↗ |
| 15 | MWH SOLV Energy, Inc. | 1.13M | $27.0M | 4.1% | New | 13F ↗ |
| 16 | CLFD Clearfield, Inc. | 810,200 | $25.2M | 3.8% | Unchanged | 13F ↗ |
| 17 | SHLS Shoals Technologies Group, Inc. | 2.35M | $19.1M | 2.9% | +4.4% | 13F ↗ |
| 18 | MEI Methode Electronics, Inc. | 730,000 | $10.1M | 1.5% | -16.8% | 13F ↗ |
| 19 | SITE SiteOne Landscape Supply, Inc. | 106,700 | $9.6M | 1.4% | -67.7% | 13F ↗ |
| 20 | LGN Legence Corp. | 110,000 | $5.9M | 0.9% | New | 13F ↗ |
Changes since Q2 2026
4 new, 5 added to, 3 trimmed, 5 exited, 8 unchanged. By estimated dollars.
New positions (4)
Added to (5)
Trimmed (3)
The 10 largest of each, by estimated dollars: shares changed times the later report's price. Index tracking, splits and mergers move positions too.
Compare two quarters
Pick any two quarters: what is new, added to, trimmed or exited. Premium plan.
Reported value by quarter
Value and number of positions at the end of each quarter.
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Largest positions in earlier quarters
Pick a quarter to see what the fund's biggest positions were then.
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Ten largest positions
By value, Q3 2026.
Filings
| Filing | ||||||
|---|---|---|---|---|---|---|
| Q3 2026 | Nov 13, 2026 | 13F-HR | 20 | $666.8M | Current | SEC ↗ |
| Q2 2026 | Aug 13, 2026 | 13F-HR | 21 | $856.3M | Current | SEC ↗ |
| Q1 2026 | May 15, 2026 | 13F-HR | 20 | $801.1M | Current | SEC ↗ |
| Q4 2025 | Feb 13, 2026 | 13F-HR | 23 | $796.8M | Current | SEC ↗ |
| Q3 2025 | Nov 14, 2025 | 13F-HR | 20 | $799.1M | Current | SEC ↗ |
| Q2 2025 | Aug 13, 2025 | 13F-HR | 21 | $761.4M | Current | SEC ↗ |
| Q1 2025 | May 13, 2025 | 13F-HR | 20 | $609.0M | Current | SEC ↗ |
Most recent first, up to 80. An amendment can replace a report or add holdings to it. All 13F filings
Information, not investment advice. Values are the fund's own figures at quarter end; a report can be up to 45 days old when filed. Disclaimer