Glossary • October 7, 2026
Bull Market
An extended period of rising stock prices and positive investor sentiment. Opposite of bear market. Bull markets are typically driven by economic growth or…
A Bull Market is an extended period of rising stock prices and positive investor sentiment, typically driven by economic growth, strong earnings, or optimistic expectations. Bull markets can last years and see index gains of 50%+ or more.
Formula
Bull Market Characteristics (qualitative, not mathematical):
- Major index up 20%+ from recent lows
- Sustained uptrend for months or years
- Improving corporate earnings
- Positive economic data (jobs, GDP growth)
Example
The 2010-2020 bull market saw the S&P 500 rise from ~1,000 to ~3,500, a 250%+ gain over a decade. The 2009-2021 period saw multiple bull markets separated by brief corrections. The 1980s and 1990s bull markets saw mega-cap stocks like Apple and Microsoft create trillions in shareholder wealth.
How to Interpret It
- Investor participation: In bull markets, more investors buy stocks ("FOMO" - fear of missing out), driving prices higher.
- Economic backdrop: Most bull markets are accompanied by economic expansion, rising corporate profits, and low unemployment.
- Sentiment matters: Bull market psychology is self-reinforcing; rising prices attract buyers, which drives prices higher.
- All stocks benefi: In a bull market, even mediocre companies rise as rising tide lifts all boats.
- Duration: Bull markets average 4-8 years; the longest modern bull markets have lasted 10+ years.
Limitations
- Bull markets don't last forever; they eventually peak and reverse into corrections or bear markets.
- Late-stage bull markets can create bubbles (1999-2000 tech bubble, 2008 housing bubble) that burst violently.
- "Sell in May and go away": Some seasonality patterns suggest summer weakness, though this is unreliable.
- Valuation becomes stretched in late-stage bull markets; new investors often buy at peaks.
Related Terms
- Bear Market — opposite; sustained period of falling prices
- Correction — temporary pullback (10-20%) within a bull market
- Market Sentiment — investor mood and psychology driving markets
- VIX — volatility index; typically low in bull markets