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Isthmus Partners, LLC
David A. Hackworthy · Investment Advisor · Value
Isthmus Partners, LLC is an independent SEC-registered investment advisor and asset manager based in Madison, Wisconsin. Founded in 2014, the firm provides customized investment management and financial planning services to a diverse clientele, including institutions, individuals, and families. Their focus is on core domestic equity strategies—spanning Large, Small-Mid, and Small Cap—supported by a blend of quantitative screening and fundamental analysis. The firm prides itself on its fiduciary responsibility and employee-owned structure, aiming for long-term capital preservation and consistent excess returns over market cycles.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +27.9% |
| YTD return | +16.3% |
| Sharpe ratio | 3.80 |
| Win rate | 61% |
| AUM | $0.4B |
| Inception | Oct 1, 2025 |
| Updated | Sep 21, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $0.4B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | https://www.isthmuspartnersllc.com |
Current Holdings
Updated on Sep 21, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| AAPL | Apple Inc | 7.4% | +23.6% |
| GOOGL | Alphabet Inc Class A | 6.6% | +28.7% |
| MSFT | Microsoft Corporation | 6.5% | +8.5% |
| AVGO | Broadcom Inc | 6.2% | +3.1% |
| V | Visa Inc. Class A | 5.6% | +4.5% |
| BNY | BlackRock New York Municipal Income Trust | 5.5% | -3.1% |
| ZBRA | Zebra Technologies Corporation | 5.4% | +18.0% |
| JNJ | Johnson & Johnson | 5.3% | +34.8% |
| TT | Trane Technologies plc | 4.7% | +1.0% |
| AMAT | Applied Materials Inc | 4.7% | +30.8% |
| GWW | WW Grainger Inc | 4.6% | +7.5% |
| PNC | PNC Financial Services Group Inc | 4.4% | +8.8% |
| ROK | Rockwell Automation Inc | 4.4% | +8.6% |
| FITB | Fifth Third Bancorp | 4.3% | +3.0% |
| ABBV | AbbVie Inc | 4.2% | +2.3% |
| EMR | Emerson Electric Company | 4.2% | +2.0% |
| CBOE | Cboe Global Markets Inc | 4.2% | +10.2% |
| PG | Procter & Gamble Company | 4.0% | -0.6% |
| DXCM | DexCom Inc | 4.0% | +7.7% |
| PAYX | Paychex Inc | 3.9% | -4.0% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Sep 21, 2026 | BUY | PG | 4.0% → 4.0% |
| Sep 21, 2026 | SELL | JNJ | 5.3% → 5.3% |
| Sep 21, 2026 | SELL | GOOGL | 6.6% → 6.6% |
| Sep 21, 2026 | BUY | V | 5.6% → 5.6% |
| Sep 21, 2026 | BUY | GWW | 4.6% → 4.6% |
Investment Style Analysis
Isthmus Partners, LLC is widely recognized for employing a Value strategy. As of Sep 21, 2026, the firm oversees approximately $0.4B in assets under management (AUM). The portfolio demonstrates a clear preference for the Drug Manufacturers - General and Banks - Regional sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Sep 21, Isthmus Partners, LLC made a significant move by increasing exposure to PG. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
Isthmus Partners' investment philosophy is anchored by the dual cornerstones of quality and valuation. The firm defines quality as the ability of a company to generate a sustainable positive spread between its return on invested capital (ROIC) and its weighted average cost of capital (WACC). Their disciplined investment process integrates proprietary quantitative techniques, such as the Excess Return Identifier (ExRISM), with deep fundamental research to identify high-quality companies whose underlying values are not fully appreciated by the market. By maintaining a focus on attractively priced assets and long-term economic value creation, the firm seeks to provide a risk-controlled runway for impactful investment results.
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 Isthmus Partners, LLC.
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Frequently asked questions
How is the simulated portfolio for Isthmus Partners, 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 Isthmus Partners, LLC's largest holding?
As of the latest filing, Isthmus Partners, LLC's top position is Apple Inc (AAPL), representing 7.4% of the portfolio. This reflects a high-conviction bet by the institution.
What is Isthmus Partners, LLC's historical performance and risk profile?
Our simulation indicates a total return of +27.9% with a win rate of 61%. Notably, the portfolio maintains a Sharpe Ratio of 3.80, suggesting an exceptional level of risk-adjusted returns compared to the broader market.
What sectors does Isthmus Partners, LLC primarily invest in?
Isthmus Partners, LLC has a strong preference for the Drug Manufacturers - General sector, which makes up 9.5% of their disclosed assets. The portfolio also has exposure to Banks - Regional, indicating a specific thematic focus.
Is Isthmus Partners, LLC's portfolio concentrated or diversified?
Isthmus Partners, LLC runs a moderately concentrated portfolio with 20 disclosed positions. The top 3 holdings alone account for 20.5% of the total portfolio weight, suggesting a strategy that favors broader market exposure.
How has Isthmus Partners, LLC performed in 2026?
Our AI-simulated model portfolio for Isthmus Partners, LLC tracks a Year-to-Date (YTD) return of +16.3%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does David A. Hackworthy manage Isthmus Partners, LLC directly?
Yes, David A. Hackworthy serves as the key portfolio manager for Isthmus Partners, LLC, overseeing the investment strategy and final capital allocation decisions.