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Mesirow Financial Investment Management, Inc.
Natalie A. Brown · Asset Manager · Multi-Strategy
Founded in 1937 by Norman Mesirow, Mesirow Financial Investment Management, Inc. is a leading independent, employee-owned financial services firm headquartered in Chicago. The institution provides a comprehensive suite of investment management, capital markets, and advisory services to a global client base, including public and corporate pension funds, endowments, and high-net-worth individuals. With a legacy spanning over eight decades, the firm is distinguished by its deep-rooted commitment to professional excellence and a culture that emphasizes partnership and long-term value creation. Mesirow operates across multiple asset classes, including equity, fixed income, currency, and private capital, leveraging its extensive market expertise to deliver tailored financial solutions.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +13.5% |
| YTD return | +6.3% |
| Sharpe ratio | 3.30 |
| Win rate | 56% |
| AUM | $2.2B |
| Inception | Oct 1, 2025 |
| Updated | Sep 4, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $2.2B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | https://www.mesirow.com |
Current Holdings
Updated on Sep 4, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| BRK-A | Berkshire Hathaway Inc | 23.9% | +2.6% |
| GOOGL | Alphabet Inc Class A | 14.7% | +29.1% |
| AAPL | Apple Inc | 14.2% | +21.6% |
| MSFT | Microsoft Corporation | 7.2% | +4.9% |
| JPM | JPMorgan Chase & Co | 5.3% | +15.5% |
| AMZN | Amazon.com Inc | 5.0% | +12.8% |
| CAT | Caterpillar Inc | 3.5% | +42.7% |
| RTX | Raytheon Technologies Corp | 3.0% | +17.6% |
| AVGO | Broadcom Inc | 2.7% | +5.4% |
| TMO | Thermo Fisher Scientific Inc | 2.5% | +15.7% |
| BAC | Bank of America Corp | 2.4% | +22.2% |
| FDX | FedEx Corporation | 2.1% | +16.4% |
| COST | Costco Wholesale Corp | 2.0% | -2.0% |
| CVX | Chevron Corp | 1.8% | +29.5% |
| UNP | Union Pacific Corporation | 1.8% | +18.2% |
| ABBV | AbbVie Inc | 1.8% | +7.4% |
| LOW | Lowe's Companies Inc | 1.7% | -17.4% |
| V | Visa Inc. Class A | 1.5% | +4.7% |
| TEL | TE Connectivity Ltd | 1.5% | +3.7% |
| JNJ | Johnson & Johnson | 1.4% | +5.7% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Aug 17, 2026 | BUY | JNJ | 0.0% → 1.4% |
| Aug 17, 2026 | BUY | BAC | 2.3% → 2.4% |
| Aug 17, 2026 | BUY | MSFT | 7.2% → 7.2% |
| Aug 17, 2026 | SELL | CAT | 3.4% → 3.5% |
| Aug 17, 2026 | SELL | AAPL | 14.3% → 14.2% |
Investment Style Analysis
Mesirow Financial Investment Management, Inc. is widely recognized for employing a Multi-Strategy strategy. As of Sep 4, 2026, the firm oversees approximately $2.2B in assets under management (AUM). The portfolio demonstrates a clear preference for the Insurance - Diversified and Internet Content & Information sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Aug 17, Mesirow Financial Investment Management, Inc. made a significant move by increasing exposure to JNJ. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
Mesirow’s investment philosophy is centered on a disciplined, research-driven approach that prioritizes long-term growth and effective risk management. The firm employs a rigorous fundamental analysis process to identify market inefficiencies and mispriced securities across various asset classes, including equities, fixed income, and alternatives. By integrating proprietary economic models and fostering a collaborative environment, Mesirow aims to achieve consistent, superior risk-adjusted returns for its clients. The strategy emphasizes diversification and a high-quality selection process, ensuring that portfolios are well-positioned to navigate changing economic cycles while aligning closely with the specific objectives and values of institutional and individual investors.
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 Mesirow Financial Investment Management, Inc..
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Frequently asked questions
How is the simulated portfolio for Mesirow Financial Investment Management, Inc. 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 Mesirow Financial Investment Management, Inc.'s largest holding?
As of the latest filing, Mesirow Financial Investment Management, Inc.'s top position is Berkshire Hathaway Inc (BRK-A), representing 23.9% of the portfolio. This reflects a high-conviction bet by the institution.
What is Mesirow Financial Investment Management, Inc.'s historical performance and risk profile?
Our simulation indicates a total return of +13.5% with a win rate of 56%. 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 Mesirow Financial Investment Management, Inc. primarily invest in?
Mesirow Financial Investment Management, Inc. has a strong preference for the Insurance - Diversified sector, which makes up 23.9% of their disclosed assets. The portfolio also has exposure to Internet Content & Information, indicating a specific thematic focus.
Is Mesirow Financial Investment Management, Inc.'s portfolio concentrated or diversified?
Mesirow Financial Investment Management, Inc. runs a moderately concentrated portfolio with 20 disclosed positions. The top 3 holdings alone account for 52.8% of the total portfolio weight, suggesting a strategy that favors broader market exposure.
How has Mesirow Financial Investment Management, Inc. performed in 2026?
Our AI-simulated model portfolio for Mesirow Financial Investment Management, Inc. tracks a Year-to-Date (YTD) return of +6.3%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does Natalie A. Brown manage Mesirow Financial Investment Management, Inc. directly?
Yes, Natalie A. Brown serves as the key portfolio manager for Mesirow Financial Investment Management, Inc., overseeing the investment strategy and final capital allocation decisions.