What is a Bull Market?
A bull market refers to a financial market condition in which prices are rising or expected to rise. The most widely accepted threshold is a 20% increase from a recent trough in a broad market index such as the S&P 500. For example, the bull market that began in March 2009 lasted over a decade, with the S&P 500 gaining more than 400% before the COVID-19 selloff in 2020.
Recognizing Bull Market Phases
Bull markets typically progress through stages: an accumulation phase where informed investors buy at depressed prices, a public participation phase where broader confidence returns and trading volume surges, and an excess phase where speculation peaks. Historically, the average bull market in U.S. equities has lasted roughly 4.4 years with a cumulative gain near 150%. Recognizing which phase the market is in helps investors calibrate position sizing and profit-taking strategies.
Key Considerations
A common mistake is assuming a bull market will continue indefinitely. Late-stage bull markets often feature narrowing breadth, where fewer stocks drive index gains while the majority stagnate. Investors should monitor advance-decline lines and sector rotation patterns rather than relying solely on headline index levels. Maintaining a disciplined rebalancing schedule prevents portfolios from becoming dangerously overweight in equities during prolonged rallies.