Portfolio Management
The art and science of selecting and overseeing investments to achieve specific financial goals within defined risk parameters.
What is Portfolio Management?
Portfolio management is the professional process of building and maintaining a collection of investments to achieve specific financial objectives while managing risk. It encompasses asset allocation (dividing capital among stocks, bonds, cash, and alternatives), security selection (choosing individual investments within each asset class), diversification, and ongoing rebalancing. Portfolio managers operate in two broad styles: active management (attempting to outperform a benchmark through research-driven selection) and passive management (replicating a market index with minimal trading). Modern portfolio theory, developed by Harry Markowitz, provides the mathematical framework for constructing optimal portfolios based on expected return, variance, and correlation among assets.
Example
A 40-year-old investor's portfolio might be allocated 70% equities, 25% bonds, and 5% alternatives. After a strong stock market year, equities might drift to 80%, increasing risk beyond the target. Portfolio management involves rebalancing — selling some equities and buying bonds — to restore the 70/25/5 allocation. This discipline forces systematic 'sell high, buy low' behavior across market cycles.