A bull market is one of the most used and least precisely defined terms in investing. It gets applied loosely to any sustained rise — but there is a conventional definition, a set of historical patterns, and a set of investor behaviors that regularly play out in them. Understanding the mechanics helps you stay rational when markets are either soaring or recovering.
What changed in 2026
- The 2023–2025 equity rally tested investors' patience and judgment — it included multiple pullbacks that were called "the end of the bull market" prematurely, demonstrating how hard it is to call the transition in real time.
- AI-driven sector concentration meant that a small number of large-cap technology companies drove a disproportionate share of major index gains, creating a bull market that felt stronger to index investors than to stock-pickers outside the dominant sectors.
- Retail investor participation remained structurally higher than pre-2020 levels, sustained by zero-commission trading and fractional shares — amplifying both bull market enthusiasm and the volatility when sentiment shifted.
- Bond markets and equities decoupled more than usual in the 2024–2026 period, making diversification across asset classes more important and less reliable simultaneously.
The definition
The conventional definition: a bull market is a rise of 20% or more from a recent low, sustained for at least two months. This distinguishes it from:
- A rally: a short-term rise of any magnitude, usually days to weeks
- A correction recovery: a rebound from a 10%+ pullback that does not yet reach 20% from the low
- A bear market bounce: a temporary rise within a broader downtrend
The 20% threshold is arbitrary but widely accepted. It is defined from the prior trough, not from an absolute price level.
How long do bull markets last?
Historical US equity bull markets (S&P 500):
| Bull market period |
Duration |
Total gain (approx) |
| 1987–2000 |
~13 years |
~582% |
| 2002–2007 |
~5 years |
~101% |
| 2009–2020 |
~11 years |
~401% |
| 2020–2022 |
~2 years |
~114% |
| 2022–present |
Ongoing |
Varies |
The average post-WWII bull market has lasted roughly 4–5 years with average total returns in the 150–200% range — though the range is wide. Bull markets are on average longer and larger than bear markets, which is the core reason long-term equity investors tend to do well.
The three phases of a bull market
Phase 1 — Accumulation (Disbelief):
Prices begin rising from a bear market low. Most investors are skeptical — "it's just a dead cat bounce." Institutional money starts positioning; sentiment is still pessimistic. This is historically the best time to buy, but the hardest psychologically.
Phase 2 — Participation (Momentum):
Economic data improves, earnings grow, media coverage turns positive. More investors enter. Prices rise steadily with moderate volatility. This is the longest phase and where most long-term returns are generated.
Phase 3 — Euphoria (Excess):
Valuations stretch above historical norms. Retail participation spikes. "Everyone" is in the market; people brag about returns at parties. Risk is highest here, but short-term momentum can continue longer than expected. This is where speculative behavior and leverage concentration tend to build.
What happens to different assets in a bull market
| Asset |
Typical bull market behavior |
| Equities (broad) |
Strong gains, especially early |
| Growth stocks |
Outperform in early-to-mid phase |
| Value stocks |
Outperform late cycle and early recovery |
| Bonds |
Often flat to negative (rates rise with growth) |
| Commodities |
Often strong mid-to-late cycle |
| Cash |
Underperforms as opportunity cost rises |
How to invest across a bull market
The evidence-based approach: Stay invested. Research consistently shows that missing the 10 best trading days in any bull market dramatically reduces total returns — and those best days are often clustered around volatility events when many investors have sold.
Practical tactics:
- Maintain your target asset allocation — rebalance when equities drift significantly above target, which naturally reduces risk as the bull market matures.
- Dollar-cost average — continue regular contributions regardless of whether markets feel high; this prevents the paralysis of "waiting for a pullback."
- Resist increasing risk late in the cycle. Late bull market conditions (stretched valuations, high sentiment, yield curve signals) are when to stick to plan, not add leverage or concentration.
- Take some gains in concentrated positions if single-stock holdings have grown to a large share of your portfolio — diversification is an appropriate response to a strong bull market.
Common mistakes
Extrapolating recent returns. A three-year 20% annual gain does not make 20% a normal expectation. Valuation-adjusted returns tend to mean-revert.
Chasing the best-performing sector. Late-cycle sector concentration (buying into whatever drove last year's returns) is a reliable way to buy high and eventually sell low.
Abandoning bonds entirely. In a prolonged bull market, bonds lag equities significantly, tempting investors to eliminate them. A moderate bond allocation provides the stability needed when the bull ends.
Assuming the bull market will continue indefinitely. All bull markets end. The question is not if but when. The correct response is not to try to time the exit, but to maintain an allocation you can hold through both bull and bear markets.
What to skip
- Leveraged ETFs as a long-term bull market play — they decay over time due to daily rebalancing math and amplify losses in drawdowns.
- Market timing based on news flow or technical signals — the evidence is clear that it does not work consistently for almost anyone.
- FOMO buying at peak valuations — history shows more patience is rewarded when markets are priced for perfection.
FAQ
How do you know when a bull market starts?
Only in retrospect — you know a bull market started when prices have already risen 20% from the low. In real time, every rise from a low looks like a potential dead cat bounce at first.
Do bull markets always follow bear markets?
Every major bull market has begun from a bear market low. The cycle of bear followed by bull is the dominant historical pattern in equity markets, though the timing is unpredictable.
Is 2026 a bull market?
Whether the current equity market meets the technical definition of a bull market depends on where prices are relative to the most recent 20%+ low. As of mid-2026, major indices have broadly recovered from 2022 lows — whether the current run qualifies as a new bull market leg is a question individual investors can assess against the definition above.
What should a new investor do in a bull market?
Invest according to your plan and time horizon, not according to where the market currently is in the cycle. Dollar-cost averaging into a broad index fund is appropriate in any phase of the market cycle.
Where to go next