Bull Market
How a Bull Market Is Defined
There’s no official governing body that declares a bull market, but the widely accepted threshold is a 20% rise from a recent trough in a broad market index like the S&P 500. Once that threshold is crossed, analysts typically backdate the start of the bull market to the trough itself.
This 20% rule is a convention, not a law. Some analysts use different benchmarks, and the definition can vary by the index being tracked. What matters more than the exact number is the direction, duration, and breadth of the advance.
Key Characteristics
Bull markets share several recurring features. Prices trend upward over months or years, not just days. Economic indicators like GDP growth, low unemployment, and rising corporate profits tend to support the advance. Investor sentiment shifts from caution to confidence — and sometimes to euphoria near the top.
Trading volume usually increases as more participants enter the market. IPO activity picks up because companies want to go public when valuations are high. Breadth matters too — a healthy bull market sees gains across many sectors, not just a handful of mega-cap names.
What Drives a Bull Market
Bull markets don’t appear out of thin air. They’re typically powered by a combination of factors:
| Driver | How It Fuels the Bull |
|---|---|
| Economic expansion | Rising GDP and consumer spending lift corporate revenues |
| Low interest rates | Cheap borrowing encourages business investment and makes stocks more attractive than bonds |
| Strong earnings growth | Rising EPS supports higher valuations |
| Investor confidence | Positive sentiment creates a self-reinforcing cycle of buying |
| Monetary policy | Accommodative Fed policy injects liquidity into markets |
Historical Bull Markets
The U.S. stock market has experienced numerous bull markets, and they tend to last significantly longer than bear markets. Here are some notable ones:
| Period | Duration | S&P 500 Gain | Context |
|---|---|---|---|
| 1982–1987 | ~5 years | ~229% | Volcker’s rate cuts, deregulation, economic recovery |
| 1990–2000 | ~10 years | ~417% | Tech boom, globalization, productivity gains |
| 2009–2020 | ~11 years | ~400% | Post-financial-crisis recovery, QE, low rates |
| 2020–2022 | ~21 months | ~114% | Post-COVID stimulus, ultra-low rates |
The 2009–2020 bull market was the longest in history, lasting nearly 11 years before the COVID crash ended it.
Bull Market vs. Bear Market
A bull market is the mirror image of a bear market, which is defined as a decline of 20% or more. Historically, bull markets last much longer and deliver much larger cumulative gains. The average U.S. bull market has lasted roughly 4–5 years, while the average bear market runs about 12–18 months.
A temporary pullback within a bull market — typically a decline of 10–20% — is called a market correction. Corrections are normal and don’t necessarily signal the start of a bear market.
How to Invest During a Bull Market
Bull markets reward staying invested, but they also breed overconfidence. A few principles help:
Stay invested. Trying to time the top is a losing game. Most of the market’s best days cluster around volatile periods — miss them and long-term returns suffer dramatically. Keep your asset allocation aligned with your risk tolerance, and rebalance periodically rather than chasing momentum.
Watch valuations. Late-stage bull markets often push P/E ratios to extremes. That doesn’t mean you should sell everything, but it does mean you should be realistic about forward returns and avoid paying any price for growth.
Diversify. Bull markets can make a concentrated portfolio look brilliant — until they end. Diversification protects you when the cycle turns.
When a Bull Market Ends
Bull markets end for different reasons — rising interest rates, economic recessions, geopolitical shocks, or simply valuations that can no longer be justified by fundamentals. The transition is rarely obvious in real time. Markets often make one last push higher before rolling over, which is why calling the top is notoriously difficult.
The VIX (the market’s fear gauge) often stays low throughout a bull market and then spikes as the trend reverses. Watching volatility patterns and credit spreads can provide early warning signs, though no single indicator is reliable on its own.
Key Takeaways
- A bull market is a 20%+ rise from a recent low, typically lasting several years.
- Economic growth, low rates, and strong earnings are the primary fuel.
- The 2009–2020 bull was the longest in U.S. history at nearly 11 years.
- Bull markets last far longer than bear markets on average.
- Stay disciplined — diversify, rebalance, and don’t let euphoria override your process.
Frequently Asked Questions
How long does a bull market typically last?
The average U.S. bull market has lasted roughly 4–5 years, though durations vary widely. The longest ran nearly 11 years (2009–2020). Shorter bull markets can last less than two years.
Are we in a bull market right now?
Bull/bear market status depends on where the S&P 500 stands relative to its most recent trough. Check the index’s current level and drawdown history for an up-to-date answer.
Can a bull market happen during a recession?
Yes. Stock markets are forward-looking and often bottom before a recession officially ends. The 2009 bull market began in March — four months before the recession ended in June 2009.
What’s the difference between a bull market and a rally?
A rally is a short-term price increase that can happen within any market environment, including bear markets. A bull market implies a sustained, multi-month-or-year uptrend of 20%+ from a trough.
Should I change my strategy during a bull market?
Not drastically. A bull market rewards staying invested and maintaining discipline. Periodically rebalance to keep your asset allocation on target, and resist the urge to take on excessive risk just because the market is rising.