AA
ACK Asset Management LLC 13F Portfolio Snapshot & Holdings (Q2 2026)
ACK Asset Management LLCCIK: 0001510940
Quality / disciplined sizingMomentum followerSector-focused
Total reported value
$856.3M
Reporting period: 2026-06-30 · Number of holdings: 21
ACK Asset Management LLC disclosed 21 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $856.3M and a quarterly turnover rate of 71.3%.
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Personality snowflake
- Concentration
- 20.91
- Portfolio Stability
- 71.29
- Momentum
- 89.45
- Sector conviction
- 85.89
- Diversification
- 42
- Sizing Uniformity
- 96.8
ACK Asset Management LLC's disclosed holdings carry a Herfindahl concentration index of 0.052 — mathematically equivalent to about 19 equally-sized positions, close to its 21 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.32), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 49% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govSold out ROG
New buy GTX
Sold out NOVT
New buy BWA
New buy DNOW
Sold out DXPE
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | WMS | Advanced Drainage Systems In | Stock-Industrials | 7.15% | +0.47% | — | |
| 2 | HLIO | Helios Technologies Inc | Stock-Other | 7.10% | +0.80% | -12.73% | |
| 3 | LFUS | Littelfuse Inc | Stock-Tech | 6.65% | +0.93% | -7.41% | |
| 4 | JHX | James Hardie Industries plc | Stock-Other | 6.42% | +1.46% | — | |
| 5 | GTX | Garrett Motion Inc | Stock-Consumer Disc | 6.35% | +6.35% | NEW | |
| 6 | CNM | Core & Main Inc-class A | Stock-Industrials | 6.14% | +0.59% | +21.11% | |
| 7 | EXP | Eagle Materials Inc | Stock-Materials | 5.78% | +1.88% | +33.33% | |
| 8 | ATS | Ats CORP | Stock-Other | 5.04% | -1.46% | -18.75% | |
| 9 | ASTE | Astec Industries Inc | Stock-Other | 4.93% | -0.36% | -12.23% | |
| 10 | MTRN | Materion CORP | Stock-Other | 4.69% | -3.88% | -71.57% | |
| 11 | BWA | Borgwarner Inc | Stock-Consumer Disc | 4.65% | +4.65% | NEW | |
| 12 | DNOW | Dnow Inc | Stock-Other | 4.54% | +4.54% | NEW | |
| 13 | MBC | Masterbrand Inc | Stock-Consumer Disc | 4.45% | +0.61% | — | |
| 14 | SITE | Siteone Landscape Supply Inc | Stock-Industrials | 4.41% | -1.07% | — | |
| 15 | SWIM | Latham Group Inc | Stock-Other | 4.28% | +0.82% | +9.69% | |
| 16 | CLFD | Clearfield Inc | Stock-Other | 3.76% | +1.33% | +10.20% | |
| 17 | ST | Sensata Technologies Holding plc | Stock-Tech | 3.34% | +3.34% | NEW | |
| 18 | ✓ | Stock-Other | 3.32% | -0.03% | +30.42% | ||
| 19 | SHLS | Shoals Technologies Group -a | Stock-Other | 2.61% | +2.61% | NEW | |
| 20 | EQPT | Equipmentshare.com Inc-a | Stock-Other | 2.44% | +2.44% | NEW | |
| 21 | MEI | Methode Electronics Inc | Stock-Other | 1.94% | +1.94% | NEW |
Portfolio Performance
Performance for Q3 2026
-6.7%
Performance Last 4 Quarters
+35.5%
- Stdev
- +28.1%
- Beta
- +1.41
- Alpha
- -10.6%
- Max Drawdown
- -20.8%
- Annualized Perf
- +14.7%
- Batting Avg vs S&P
- +50%
- Sortino
- +1.01
- Stutzer
- +0.18
- Treynor
- +0.12
- Sterling
- +0.58
- Calmar
- +0.71
- Information Ratio
- -0.11
- Tracking Error
- +22%
- Stdev Down
- +17.5%
- Winning Months %
- +58.3%
- Losing Months %
- +41.7%
- Best 12 Months
- +89.3%
- Worst 12 Months
- -20.2%
- Efficiency Ratio
- +0.2
- Sharpe
- +0.63
- Stdev Sectors
- +9.5%
- Skewness
- -0.2
- Kurtosis
- -0.86
- Upside Potential
- +2.91
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q2 | 21 | $856.3M | 71 | ||
| 2026 Q1 | 20 | $801.1M | 48 | ||
| 2025 Q4 | 23 | $796.8M | 44 | ||
| 2025 Q3 | 20 | $799.1M | 98 | ||
| 2025 Q2 | 21 | $761.4M | 0 | ||
| 2025 Q1 | 20 | $609.0M | 100 | ||
| 2024 Q4 | 22 | $746.4M | 0 | ||
| 2024 Q3 | 18 | $809.2M | 0 | ||
| 2024 Q2 | 19 | $810.3M | 0 | ||
| 2024 Q1 | 20 | $858.3M | 0 | ||
| 2023 Q4 | 21 | $831.3M | 0 | ||
| 2023 Q3 | 21 | $688.2M | 0 | ||
| 2023 Q2 | 23 | $802.9M | 0 | ||
| 2023 Q1 | 23 | $655.1M | 0 | ||
| 2022 Q4 | 25 | $544.6M | 0 | ||
| 2022 Q3 | 23 | $377.5M | 0 | ||
| 2022 Q2 | 21 | $357.3M | 0 | ||
| 2022 Q1 | 24 | $461.0M | 0 | ||
| 2021 Q4 | 27 | $423.9M | 0 | ||
| 2021 Q3 | 26 | $341.6M | 0 | ||
| 2021 Q2 | 24 | $271.7M | 96 | ||
| 2021 Q1 | 23 | $251.4M | 53 | ||
| 2020 Q4 | 28 | $242.9M | 68 | ||
| 2020 Q3 | 19 | $194.6M | 38 | ||
| 2020 Q2 | 20 | $220.6M | 52 | ||
| 2020 Q1 | 20 | $200.2M | 93 | ||
| 2019 Q4 | 23 | $344.6M | 100 | ||
| 2019 Q3 | 374 | $503.0M | 100 | ||
| 2019 Q2 | 26 | $344.3M | 99 | ||
| 2019 Q1 | 30 | $361.7M | 77 | ||
| 2018 Q4 | 29 | $294.9M | 63 | ||
| 2018 Q3 | 26 | $364.0M | 48 | ||
| 2018 Q2 | 32 | $374.5M | 54 | ||
| 2018 Q1 | 29 | $397.6M | 60 | ||
| 2017 Q4 | 32 | $445.4M | 76 | ||
| 2017 Q3 | 30 | $362.2M | 68 | ||
| 2017 Q2 | 33 | $443.2M | 54 | ||
| 2017 Q1 | 27 | $337.4M | 86 | ||
| 2016 Q4 | 30 | $340.0M | 78 | ||
| 2016 Q3 | 31 | $329.9M | 62 | ||
| 2016 Q2 | 27 | $336.5M | 64 | ||
| 2016 Q1 | 26 | $254.1M | 85 | ||
| 2015 Q4 | 23 | $195.1M | 89 | ||
| 2015 Q3 | 22 | $238.9M | 79 | ||
| 2015 Q2 | 32 | $357.7M | 61 | ||
| 2015 Q1 | 35 | $316.6M | 90 | ||
| 2014 Q4 | 35 | $277.4M | 52 | ||
| 2014 Q3 | 29 | $278.4M | 57 | ||
| 2014 Q2 | 31 | $332.7M | 45 | ||
| 2014 Q1 | 31 | $303.7M | 75 | ||
| 2013 Q4 | 34 | $303.2M | 78 | ||
| 2013 Q3 | 31 | $260.0M | 100 | ||
| 2013 Q2 | 40 | $246.7M | 0 |
Holding changes this quarter
ACK Asset Management LLC's most significant position changes for 2026-06-30: New buy: Garrett Motion Inc (GTX); Sold out: Rogers CORP (ROG); Sold out: Novanta Inc (NOVT); New buy: Borgwarner Inc (BWA); New buy: Dnow Inc (DNOW).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | GTX | Garrett Motion Inc | +6.4% | NEW | New buy |
| 2 | BWA | Borgwarner Inc | +4.7% | NEW | New buy |
| 3 | DNOW | Dnow Inc | +4.5% | NEW | New buy |
| 4 | ST | Sensata Technologies Holding plc | +3.3% | NEW | New buy |
| 5 | SHLS | Shoals Technologies Group -a | +2.6% | NEW | New buy |
| 6 | EQPT | Equipmentshare.com Inc-a | +2.4% | NEW | New buy |
| 7 | MEI | Methode Electronics Inc | +1.9% | NEW | New buy |
| 8 | EXP | Eagle Materials Inc | +1.9% | +33.33% | Add |
| 9 | JHX | James Hardie Industries plc | +1.5% | — | Unchanged |
| 10 | CLFD | Clearfield Inc | +1.3% | +10.20% | Add |
| 11 | LFUS | Littelfuse Inc | +0.9% | -7.41% | Trim |
| 12 | SWIM | Latham Group Inc | +0.8% | +9.69% | Add |
| 13 | HLIO | Helios Technologies Inc | +0.8% | -12.73% | Trim |
| 14 | MBC | Masterbrand Inc | +0.6% | — | Unchanged |
| 15 | CNM | Core & Main Inc-class A | +0.6% | +21.11% | Add |
| 16 | WMS | Advanced Drainage Systems In | +0.5% | — | Unchanged |
| 17 | ✓ | 0% | +30.42% | Add | |
| 18 | ASTE | Astec Industries Inc | -0.4% | -12.23% | Trim |
| 19 | SITE | Siteone Landscape Supply Inc | -1.1% | — | Unchanged |
| 20 | ATS | Ats CORP | -1.5% | -18.75% | Trim |
| 21 | CTS | Cts CORP | -3.5% | EXIT | Sold out |
| 22 | GVA | Granite Construction Inc | -3.7% | EXIT | Sold out |
| 23 | MTRN | Materion CORP | -3.9% | -71.57% | Trim |
| 24 | CDNL | Cardinal Infrastructure Gr-a | -4.3% | EXIT | Sold out |
| 25 | DXPE | Dxp Enterprises Inc | -4.5% | EXIT | Sold out |
| 26 | NOVT | Novanta Inc | -5.5% | EXIT | Sold out |
| 27 | ROG | Rogers CORP | -6.4% | EXIT | Sold out |
Filing History
FAQ
What is ACK Asset Management LLC and what type of investor is it?
ACK Asset Management LLC is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-06-30), the firm manages a tracked equity portfolio valued at approximately $856.3M, spread across 21 disclosed positions.
What are ACK Asset Management LLC's largest equity positions?
Based on the latest 13F filing, ACK Asset Management LLC's top holdings by market value are:
1. Advanced Drainage Systems In (WMS) — $61.2M (7.2%)
2. Helios Technologies Inc (HLIO) — $60.8M (7.1%)
3. Littelfuse Inc (LFUS) — $56.9M (6.7%)
4. James Hardie Industries plc (JHX) — $55.0M (6.4%)
5. Garrett Motion Inc (GTX) — $54.3M (6.3%)
What changes did ACK Asset Management LLC make in its most recent portfolio filing?
In the latest reported quarter, ACK Asset Management LLC made 23 notable position adjustments: 7 new positions were initiated, 5 existing holdings were added to, 5 positions were partially reduced, and 6 were completely exited. The largest of these moves: New buy: Garrett Motion Inc (GTX); Sold out: Rogers CORP (ROG); Sold out: Novanta Inc (NOVT); New buy: Borgwarner Inc (BWA); New buy: Dnow Inc (DNOW)
What sectors does ACK Asset Management LLC focus on?
ACK Asset Management LLC is concentrated in the following sectors based on its current disclosed equity portfolio:
• Industrials: 36.2%
• Consumer Discretionary: 31.6%
• Information Technology: 20.4%
• Materials: 11.8%
* This report is exclusively curated by the AlphaSMO team. AlphaSMO is the web's most authoritative 13F / Inside Trader database, delivering precise insider trading and institutional holdings insights.
Investment Profile
ACK Asset Management LLC returned an annualized 14.7% over the trailing 36 months — underperforming the S&P 500 by 10.6 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 1.41 (more volatile than the market) and a 50% quarterly batting average against the index.
Its portfolio is broadly diversified and fast-trading, with 36.2% of the portfolio concentrated in Industrials.
Its turnover score has risen from 0 to 71 over the past 4 quarters — a shift toward more active trading.
It has added to its H55555108 position for two straight quarters, increasing it by $22.9M to reach $28.5M.
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