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ACK Asset Management LLC
Richard S. Meisenberg · Hedge Fund · Long/Short Equity
ACK Asset Management LLC is a Greenwich, Connecticut-based investment firm founded in 2005 by Richard S. Meisenberg and John H. Reilly III. The firm specializes in managing concentrated portfolios of U.S. equities for institutional investors and high-net-worth individuals. Registered as an investment adviser with the SEC, the firm maintains a lean team of experienced professionals dedicated to identifying unique opportunities within the equity markets, primarily utilizing a fundamental research-driven approach to portfolio construction.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +23.2% |
| YTD return | +17.4% |
| Sharpe ratio | 3.30 |
| Win rate | 50% |
| AUM | $0.9B |
| Inception | Oct 1, 2025 |
| Updated | Sep 21, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $0.9B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | http://www.ackasset.com |
Current Holdings
Updated on Sep 21, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| MTRN | Materion Corporation | 14.4% | +91.5% |
| ROG | Rogers Corporation | 8.5% | +9.4% |
| CDNL | Cardinal Infrastructure Group Inc. Class A Common Stock | 7.9% | -29.2% |
| HLIO | Helios Technologies Inc | 7.8% | +19.9% |
| LFUS | Littelfuse Inc | 7.2% | -14.6% |
| NOVT | Novanta Inc | 6.4% | -6.2% |
| WMS | Advanced Drainage Systems Inc | 6.3% | -10.5% |
| DXPE | DXP Enterprises Inc | 5.0% | +24.3% |
| ASTE | Astec Industries Inc | 4.9% | -18.4% |
| CNM | Core & Main Inc | 4.8% | -17.6% |
| CTS | CTS Corporation | 4.3% | -12.4% |
| EXP | Eagle Materials Inc | 4.1% | -21.2% |
| GVA | Granite Construction Incorporated | 4.1% | +7.6% |
| SITE | SiteOne Landscape Supply Inc | 4.0% | -30.0% |
| MBC | MasterBrand Inc. | 3.7% | -37.2% |
| SWIM | Latham Group Inc | 3.3% | +10.0% |
| CLFD | Clearfield Inc | 3.3% | -13.3% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Jun 22, 2026 | BUY | EXP | 4.5% → 4.1% |
| Jun 22, 2026 | BUY | DXPE | 4.2% → 5.0% |
| Jun 22, 2026 | BUY | LFUS | 0.0% → 7.2% |
| Jun 22, 2026 | BUY | CDNL | 3.2% → 7.9% |
| Jun 22, 2026 | SELL | AIN | 4.2% → 0.0% |
Investment Style Analysis
ACK Asset Management LLC is widely recognized for employing a Long/Short Equity strategy. As of Sep 21, 2026, the firm oversees approximately $0.9B in assets under management (AUM). The portfolio demonstrates a clear preference for the Electronic Components and Other Industrial Metals & Mining sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Jun 22, ACK Asset Management LLC made a significant move by increasing exposure to EXP. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
The firm employs a long/short equity strategy primarily focused on the small and mid-capitalization segments of the U.S. market. Its philosophy is rooted in capitalizing on market inefficiencies where major institutional investments often gravitate toward larger, more liquid securities. ACK Asset Management targets companies with high-quality management teams, established track records, and significant insider ownership, viewing management as partners in their investments. The strategy aims to deliver significant capital appreciation and strong absolute returns while prioritizing capital preservation through various hedging techniques and rigorous fundamental analysis.
Disclaimer
The content provided on this page, including the simulated portfolio performance, holdings analysis, and AI-generated insights, is for informational and educational purposes only. It does not constitute financial advice, investment recommendations, or an offer to buy or sell any securities. All data is derived from historical SEC 13F filings and other public disclosures, which have a reporting lag. The "Simulated Performance" is a hypothetical reconstruction based on past disclosures and does not represent the actual returns of the institution. Past performance is not indicative of future results. Tritonix.ai is not affiliated with ACK Asset Management LLC.
Similar Investment Style
Based on Long/Short Equity.
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Frequently asked questions
How is the simulated portfolio for ACK Asset Management LLC constructed?
This simulation is powered by Tritonix AI using official SEC filings. We focus on the "Best Ideas" by filtering for only the Top 20 largest holdings and rebalancing them to 100%. The simulation tracks performance starting from Oct 1, 2025. Our AI monitors for updates every Monday to capture major shifts. This concentrated approach highlights the manager's true stock-picking skill and mirrors their actual investment returns.
What is ACK Asset Management LLC's largest holding?
As of the latest filing, ACK Asset Management LLC's top position is Materion Corporation (MTRN), representing 14.4% of the portfolio. This reflects a high-conviction bet by the institution.
What is ACK Asset Management LLC's historical performance and risk profile?
Our simulation indicates a total return of +23.2% with a win rate of 50%. Notably, the portfolio maintains a Sharpe Ratio of 3.30, suggesting an exceptional level of risk-adjusted returns compared to the broader market.
What sectors does ACK Asset Management LLC primarily invest in?
ACK Asset Management LLC has a strong preference for the Electronic Components sector, which makes up 20.0% of their disclosed assets. The portfolio also has exposure to Other Industrial Metals & Mining, indicating a specific thematic focus.
Is ACK Asset Management LLC's portfolio concentrated or diversified?
ACK Asset Management LLC runs a highly concentrated portfolio with 17 disclosed positions. The top 3 holdings alone account for 30.8% of the total portfolio weight, suggesting a strategy that favors deep research into a few key names.
How has ACK Asset Management LLC performed in 2026?
Our AI-simulated model portfolio for ACK Asset Management LLC tracks a Year-to-Date (YTD) return of +17.4%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does Richard S. Meisenberg manage ACK Asset Management LLC directly?
Yes, Richard S. Meisenberg serves as the key portfolio manager for ACK Asset Management LLC, overseeing the investment strategy and final capital allocation decisions.