Mellon Capital Long-Short Small Cap Architecture

  • portfolio construction
  • long-short
  • factor crowding

Context

Within a ~$400M U.S. small-cap long-short strategy at Mellon Capital, developed quantitative factors and portfolio construction enhancements. Designed a portfolio optimization constraint to maximize differentiation from common institutional factor exposures using fund holdings data, factor crowding metrics, and market microstructure intelligence.

Impact

This architecture materially reduced unintended beta exposure during systemic stress. In 2008, while most long-only and long-short portfolios experienced significant drawdowns, the strategy delivered approximately flat performance and ranked at the top of its peer group.