Ack Asset Management LLC: 13F holdings, Q2 2026
Hedge fund · SEC EDGAR filings (CIK 1510940) · Explore on the interactive board
Ack Asset Management LLC disclosed 21 US equity positions worth $856.3m in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 13, 2026). Its largest position is WMS at 7.1% of the reported book, followed by HLIO, LFUS. The top ten holdings are 60.2% of the book, and the portfolio behaves like about 19 equal-weight positions. Versus the prior filing it opened 7 new positions, added to 5, reduced 5 and exited 6. Note: this manager's most recent filing is 3934 quarters behind the newest quarter on file, so these figures are history rather than current positioning.
What does Ack Asset Management LLC own? Top holdings as of June 30, 2026
Change is measured in shares against the previous filing (Q1 2026), so price moves do not read as decisions. This quarter: 7 new, 5 added, 5 reduced, 6 exited.
| # | Stock | Sector | Weight | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|---|
| 1 | WMS WMS | Industrials | 7.1% | $61.2m | 390,000 | 0% | held |
| 2 | HLIO HLIO | Industrials | 7.1% | $60.8m | 681,000 | -13% | reduced |
| 3 | LFUS LFUS | Technology | 6.6% | $56.9m | 125,000 | -7% | reduced |
| 4 | JHX JHX | Basic Materials | 6.4% | $55.0m | 2,100,000 | 0% | held |
| 5 | GTX GTX | Consumer Cyclical | 6.3% | $54.3m | 1,500,000 | – | new |
| 6 | CNM CNM | Industrials | 6.1% | $52.6m | 1,090,000 | 21% | added |
| 7 | EXP EXP | Basic Materials | 5.8% | $49.5m | 220,000 | 33% | added |
| 8 | ATS ATS | Industrials | 5.0% | $43.2m | 1,500,000 | -19% | reduced |
| 9 | ASTE ASTE | Industrials | 4.9% | $42.2m | 690,276 | -12% | reduced |
| 10 | MTRN MTRN | Basic Materials | 4.7% | $40.1m | 135,000 | -72% | reduced |
| 11 | BWA BWA | Consumer Cyclical | 4.7% | $39.8m | 600,000 | – | new |
| 12 | DNOW DNOW | Industrials | 4.5% | $38.9m | 3,000,000 | – | new |
| 13 | MBC MBC | Consumer Cyclical | 4.4% | $38.1m | 3,700,000 | 0% | held |
| 14 | SITE SITE | Industrials | 4.4% | $37.8m | 330,000 | 0% | held |
| 15 | SWIM SWIM | Industrials | 4.3% | $36.6m | 5,660,000 | 10% | added |
| 16 | CLFD CLFD | Technology | 3.8% | $32.2m | 810,200 | 10% | added |
| 17 | ST | 3.3% | $28.6m | 600,000 | – | new | |
| 18 | AERO-SWX | 3.3% | $28.5m | 1,082,500 | 30% | added | |
| 19 | SHLS SHLS | Technology | 2.6% | $22.3m | 2,255,000 | – | new |
| 20 | EQPT EQPT | Industrials | 2.4% | $20.9m | 1,064,830 | – | new |
| 21 | MEI MEI | Technology | 1.9% | $16.6m | 877,500 | – | new |
What did Ack Asset Management LLC sell? Positions exited since the previous filing
| Stock | Prior weight | Prior value |
|---|---|---|
| ROG ROG | 22.7% | $51.0m |
| NOVT NOVT | 19.8% | $44.3m |
| DXPE DXPE | 16.2% | $36.3m |
| CDNL CDNL | 15.5% | $34.7m |
| GVA GVA | 13.4% | $30.0m |
| CTS CTS | 12.4% | $27.9m |
Sector mix
| Sector | Weight |
|---|---|
| Industrials | 46.0% |
| Basic Materials | 16.9% |
| Consumer Cyclical | 15.4% |
| Technology | 15.0% |
Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.
Filing history
How concentrated is Ack Asset Management LLC's portfolio?
Across every quarter Ack Asset Management LLC has filed, its median largest position is 7.9% of the book and its median top-ten weight is 61.1%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 6.0 completed holding spells, the median lasted 1.0 quarters; 21.0 positions are still open and their final length is unknown.