Investment Portfolio
An investment portfolio is the complete collection of financial assets you own — stocks, bonds, ETFs, real estate, cash, and other investments. Portfolio construction involves selecting a mix of assets that matches your risk tolerance, time horizon, and goals.
The central concept in portfolio management is diversification — spreading risk across many assets so that no single investment failure is catastrophic. Modern Portfolio Theory (MPT) showed that combining assets with low correlation to each other can reduce overall portfolio volatility without reducing expected return.
A classic portfolio structure is the 60/40 portfolio: 60% stocks (growth), 40% bonds (stability). Younger investors often hold more equities (80–100%); those near retirement shift toward bonds and cash to protect against sequence-of-returns risk.
Reviewing and rebalancing your portfolio annually — selling over-weighted assets and buying under-weighted ones — maintains your target allocation and forces the discipline of buying low and selling high.
Related terms
- Diversification
- Diversification is the practice of spreading investments across different assets, sectors, or geographies to reduce risk. A diversified portfolio is less volatile than any single holding because losses in one area are offset by gains in others.
- Asset Allocation
- Asset allocation is the percentage split of a portfolio among different asset classes — typically stocks, bonds, and cash. It is the primary driver of long-term portfolio risk and return.
- Portfolio Rebalancing
- Rebalancing is the process of realigning the weights of portfolio holdings back to a target asset allocation — selling assets that have grown above target and buying those that have fallen below.
- ETF (Exchange-Traded Fund)
- An ETF is a basket of securities — stocks, bonds, or other assets — that trades on a stock exchange like a single share. ETFs combine the diversification of a mutual fund with the flexibility of stock trading and typically have very low expense ratios.