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Boston Common Asset Management, LLC
Geeta Aiyer · Asset Manager · Value
Boston Common Asset Management, LLC (BCAM), founded in 2003, is a women-led and employee-owned investment firm based in Boston. The firm specializes in global sustainable equity investing, integrating environmental, social, and governance (ESG) factors into its fundamental research. BCAM is recognized for its proactive shareholder engagement, where it leverages its role as an investor to influence corporate behavior and advocate for transparency, accountability, and positive social and environmental outcomes. It serves a diverse clientele, including institutional and individual investors, with a focus on delivering long-term capital appreciation and meaningful impact through high-conviction, high-quality portfolios across U.S., developed, and emerging markets.
Simulated Performance
| Metric | Value |
|---|---|
| Total return | +17.3% |
| YTD return | +10.5% |
| Sharpe ratio | 4.13 |
| Win rate | 41% |
| AUM | $0.8B |
| Inception | Oct 1, 2025 |
| Updated | Sep 18, 2026 |
Institution Status
| Field | Value |
|---|---|
| AUM | $0.8B |
| Turnover | Low (<15%) |
| Avg holding | 18 Months |
| Inception | Oct 1, 2025 |
| Website | https://www.bostoncommonasset.com |
Current Holdings
Updated on Sep 18, 2026.
| Ticker | Name | Portfolio % | Return |
|---|---|---|---|
| TSM | Taiwan Semiconductor Manufacturing | 14.1% | +29.1% |
| GOOGL | Alphabet Inc Class A | 10.3% | +24.8% |
| NVDA | NVIDIA Corporation | 9.8% | +12.8% |
| MSFT | Microsoft Corporation | 9.5% | +8.2% |
| AAPL | Apple Inc | 8.8% | +23.5% |
| AVGO | Broadcom Inc | 5.1% | -0.3% |
| MS | Morgan Stanley | 4.1% | +18.9% |
| V | Visa Inc. Class A | 4.0% | +9.7% |
| MRK | Merck & Company Inc | 3.5% | +13.3% |
| SPOT | Spotify Technology SA | 3.2% | +13.6% |
| LLY | Eli Lilly and Company | 3.1% | +11.3% |
| SIEGY | Siemens AG ADR | 3.0% | +2.5% |
| NFLX | Netflix Inc | 3.0% | -20.4% |
| MU | Micron Technology Inc | 2.9% | +5.5% |
| AMAT | Applied Materials Inc | 2.8% | -19.0% |
| DGX | Quest Diagnostics Incorporated | 2.7% | +6.6% |
| BABA | Alibaba Group Holding Ltd | 2.7% | +0.4% |
| WAB | Westinghouse Air Brake Technologies Corp | 2.5% | -6.7% |
| CL | Colgate-Palmolive Company | 2.5% | -3.7% |
| HUBB | Hubbell Inc | 2.4% | -3.5% |
Recent activity
| Date | Action | Ticker | Weight |
|---|---|---|---|
| Sep 14, 2026 | SELL | MRK | 3.6% → 3.5% |
| Sep 14, 2026 | BUY | MS | 4.1% → 4.1% |
| Sep 14, 2026 | BUY | WAB | 2.5% → 2.5% |
| Sep 14, 2026 | BUY | AMAT | 2.7% → 2.8% |
| Sep 14, 2026 | BUY | NVDA | 10.2% → 9.8% |
Investment Style Analysis
Boston Common Asset Management, LLC is widely recognized for employing a Value strategy. As of Sep 18, 2026, the firm oversees approximately $0.8B in assets under management (AUM). The portfolio demonstrates a clear preference for the Semiconductors and Internet Content & Information sectors, reflecting a high-conviction approach to capital allocation.
Recent Market Moves
During the latest rebalancing period ending Sep 14, Boston Common Asset Management, LLC made a significant move by reducing the position in MRK. This adjustment aligns with the fund's dynamic approach to risk management and capital deployment in current market conditions.
Investment Philosophy
Boston Common's investment philosophy is rooted in the belief that companies proactively addressing sustainability challenges are better positioned to experience strong demand and build lasting competitive advantages. The firm employs an active, long-only approach that combines proprietary fundamental financial analysis with rigorous ESG research to identify innovative and attractively valued companies. A key pillar of their strategy is impact momentum, achieved through strategic shareholder engagement and stewardship. By maintaining a sustained dialogue with portfolio companies and participating in shareholder resolutions, BCAM seeks to mitigate risks and catalyze positive corporate changes that contribute to financial alpha and a more sustainable global economy.
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 Boston Common Asset Management, LLC.
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Frequently asked questions
How is the simulated portfolio for Boston Common 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 Boston Common Asset Management, LLC's largest holding?
As of the latest filing, Boston Common Asset Management, LLC's top position is Taiwan Semiconductor Manufacturing (TSM), representing 14.1% of the portfolio. This reflects a high-conviction bet by the institution.
What is Boston Common Asset Management, LLC's historical performance and risk profile?
Our simulation indicates a total return of +17.3% with a win rate of 41%. Notably, the portfolio maintains a Sharpe Ratio of 4.13, suggesting an exceptional level of risk-adjusted returns compared to the broader market.
What sectors does Boston Common Asset Management, LLC primarily invest in?
Boston Common Asset Management, LLC has a strong preference for the Semiconductors sector, which makes up 31.8% of their disclosed assets. The portfolio also has exposure to Internet Content & Information, indicating a specific thematic focus.
Is Boston Common Asset Management, LLC's portfolio concentrated or diversified?
Boston Common Asset Management, LLC runs a moderately concentrated portfolio with 20 disclosed positions. The top 3 holdings alone account for 34.2% of the total portfolio weight, suggesting a strategy that favors broader market exposure.
How has Boston Common Asset Management, LLC performed in 2026?
Our AI-simulated model portfolio for Boston Common Asset Management, LLC tracks a Year-to-Date (YTD) return of +10.5%. This metric helps investors gauge the institution's effectiveness in the current market environment.
Does Geeta Aiyer manage Boston Common Asset Management, LLC directly?
Yes, Geeta Aiyer serves as the key portfolio manager for Boston Common Asset Management, LLC, overseeing the investment strategy and final capital allocation decisions.