Marlena Lee on Factor Investing, Market Insights, and Smarter Diversification

Marlena Lee, Global Head of Investment Solutions at Dimensional Fund Advisors, explains how her team bridges investment research with client needs through systematic, evidence-based approaches. Rather than chasing short-term market moves or stock-picking, Dimensional builds portfolios grounded in decades of academic research and practical data analysis. Lee highlights how the firm evaluates traditional factors—such as size, value, and profitability—while carefully testing new ideas to avoid data-mined results. She underscores the importance of looking beyond simple measures like correlations or Sharpe ratios, encouraging investors to dig deeper into underlying holdings, factor overlaps, and global perspectives. From the challenges of timing premiums to the distortions caused by mega-cap stocks, Lee emphasizes the value of strategic, long-term allocations over tactical shifts. Her remarks offer clarity on what true diversification means and how investors can navigate trade-offs between tracking error and long-term outperformance.