What Happens in a Bull Market?

The Short Answer

A bull market is typically defined as a 20% or greater rise from a recent trough in a major index, or more loosely as a sustained period of rising stock prices accompanied by improving economic fundamentals. Bull markets vary considerably in character: the longest modern U.S. bull market ran from 2009 to 2020 with nearly uninterrupted gains across roughly 11 years. Bull markets typically go through distinct phases where different sectors and strategies lead, with early cycles often rewarding risk-taking and late cycles tending to reward quality and defensive positioning.

The Phases of a Bull Market

Bull markets are rarely uniform. Investors and economists often describe three broad phases, each with its own characteristics in terms of economic momentum, sector leadership, credit conditions, and investor sentiment.

Early Cycle: Recovery

In the early cycle, stocks often rise sharply from depressed levels as investors anticipate improving conditions before those conditions fully arrive. Valuations expand from trough levels even before earnings fully recover. Financial stocks and cyclicals tend to lead, because they are the most beaten-down and most directly benefit from returning economic activity. Credit conditions ease as central banks typically hold rates low to support the recovery. Economic data turns positive but may remain weak in absolute terms.

Mid-Cycle: Expansion

In the mid-cycle, the recovery becomes an established expansion. GDP grows steadily, corporate earnings grow alongside it, and the stock market continues higher at a more measured pace than the early bounce. Participation tends to broaden across sectors, as a rising economic tide lifts multiple industries simultaneously. Credit remains available and relatively cheap. Technology, healthcare, and growth sectors often perform well during this phase as earnings growth accelerates and investors are willing to pay for future growth.

Late Cycle: Overheating

In the late cycle, economic growth remains positive but may begin to slow from its peak rate. Inflation can begin rising as the economy operates near capacity. Central banks begin tightening policy by raising interest rates, removing accommodation they provided during the recovery. The stock market may continue higher, but leadership begins rotating. Defensive and quality stocks tend to begin outperforming speculative and high-growth names. The yield curve may flatten as short rates rise faster than long rates. Speculative activity often intensifies near the end of this phase.

Which Sectors and Strategies Tend to Lead

Sector leadership is one of the most studied aspects of bull market cycles, because getting sector exposure right has historically been one of the primary drivers of relative performance.

Early Cycle Leadership

Financials often lead in the early cycle. Banks benefit from an improving credit environment, recovering loan demand, and a steepening yield curve (they borrow short and lend long, so a steeper curve tends to improve margins). Consumer discretionary companies benefit as employment improves and household spending recovers. Industrials pick up as manufacturing and construction resume. Small-cap and value stocks have historically often outperformed in early cycle periods, as deeply discounted companies experience the most dramatic recovery from their lows.

Mid-Cycle Leadership

Mid-cycle tends to feature broad participation, but technology and healthcare companies have frequently been strong performers as the expansion matures. These sectors benefit from continued earnings growth, innovation cycles, and investors' willingness to pay for growth when the economic backdrop is stable. Growth-oriented strategies tend to perform well when earnings growth is strong and interest rates remain moderate.

Late Cycle Leadership

Late cycle tends to reward quality. Companies with strong balance sheets, consistent earnings histories, pricing power, and lower debt levels tend to hold up better when growth is moderating and rates are rising. Energy has historically shown relative strength during inflationary late-cycle periods. Defensive sectors, including consumer staples and utilities, begin to show relative strength as investors prioritize stability over growth. Value strategies may regain relevance if speculative growth stocks have become extremely expensive.

Valuation Dynamics in Bull Markets

Understanding how valuations evolve across a bull market is central to understanding what drives returns at different stages.

P/E Expansion in Early Bull Markets

In early bull markets, a significant portion of the initial price gain often comes from price-to-earnings (P/E) multiple expansion rather than earnings growth. Investors reprice stocks higher because they expect earnings to improve, even before those earnings have actually arrived. This repricing can produce rapid gains in the early months of a new bull market, sometimes before economic data has fully turned positive.

Earnings Growth Takes Over

In mature, mid-cycle bull markets, valuations may stabilize at higher levels while actual earnings growth becomes the primary driver of further price appreciation. This is a healthier and more sustainable form of price growth. It is less exciting than the rapid multiple expansion of the early phase but reflects real improvement in corporate profitability.

Late-Cycle Valuation Stretch

Bull markets often end with valuations that have become elevated relative to historical averages. When economic growth begins slowing or interest rates rise, the high P/E multiples that seemed reasonable under the prior conditions may become difficult to sustain. Investors who arrived late in the cycle and paid high multiples for future growth face the most risk if growth disappoints.

Historical Examples

The 1990s Bull Market

The U.S. bull market of the 1990s saw the S&P 500 rise approximately 415% from 1990 to the 2000 peak. Technology and growth stocks drove the latter stages of the cycle. P/E multiples reached extreme levels by historical standards, particularly in technology and internet-related companies. A narrative of internet-driven productivity gains sustained investor optimism late into the cycle. The bull market ended in early 2000 as valuations proved unsustainable and the economic growth rate began to slow.

The 2009-2020 Bull Market

The longest modern U.S. bull market began from the March 2009 lows with equity valuations deeply compressed after the financial crisis. It was driven by recovering earnings, falling interest rates across the cycle, central bank support through quantitative easing, and eventually by technology and growth-company dominance in the latter years. This bull market saw considerable internal rotation: value stocks led early, then gave way to growth and technology leadership as the cycle matured. It ended abruptly in February 2020 when the COVID-19 pandemic created an external shock with no precedent in modern markets.

The 2020-2021 Post-COVID Bull Market

The post-COVID bull market was extremely sharp and unusual in character. It began from the March 2020 lows with massive fiscal stimulus and near-zero interest rates, producing some of the fastest gains in stock market history. The pandemic-driven demand for remote work technology and e-commerce accelerated growth for those sectors dramatically. By 2021, SPAC issuance, meme stock activity, and extremely high valuations for speculative growth companies reflected late-cycle behavior compressed into a very short timeframe, as the cycle moved rapidly from recovery to overheating driven by unprecedented monetary and fiscal policy.

Credit Conditions and Investor Sentiment

Credit conditions and investor sentiment are important contextual factors in understanding where a bull market stands in its cycle, even if they are not reliable timing tools.

Credit conditions tend to improve and remain loose through most of a healthy bull market. Low credit spreads, easy loan availability, and strong corporate bond issuance are consistent with mid-cycle expansion. Tightening credit conditions, widening spreads, or deteriorating credit quality tend to appear later in the cycle or at its end.

Investor sentiment moves through a recognizable arc: from fear and disbelief in the early phase (many investors missed the lows and wait for a pullback that does not come), to acceptance and participation in the mid-cycle, and often to complacency and even euphoria in the late stages. The presence of speculative activity, such as surges in initial public offerings, heavy use of leverage, and interest in novel or complex investment vehicles, has historically tended to be more pronounced in late-cycle conditions. These signals are informative but not mechanically predictive: the late cycle can persist for longer than most observers expect.

How Bull Markets Typically End

Bull markets have ended through several different mechanisms, and understanding the typical causes helps investors think about risk as a cycle matures.

• Rising interest rates: Higher rates reduce the present value of future earnings, compressing valuations, and increase borrowing costs for consumers and companies, slowing economic activity.
• Economic slowdown: When GDP growth slows sharply or turns negative, corporate earnings growth stalls or reverses, removing the fundamental support for high equity prices.
• Credit conditions tightening: Banks pulling back on lending, credit spreads widening, and reduced access to financing can act as a brake on economic activity and equity markets simultaneously.
• Inflation forcing faster-than-expected policy response: When inflation rises to levels that require rapid central bank action, the rate increases needed to contain it can quickly compress valuations and slow growth at the same time.
• External shock: A pandemic, geopolitical conflict, financial crisis, or other unforeseen event can abruptly end a bull market that might otherwise have continued.

What Can Make This Different

The typical bull market framework describes general tendencies, but actual market cycles often diverge from the pattern in important ways.

Duration is highly variable. Some bull markets last 2-3 years; the 2009-2020 example lasted over a decade. There is no predetermined length, and markets can extend well past the point where observers expect a turn.

Not all sectors participate equally at all times. A headline index that is rising in a "bull market" can mask significant divergence underneath. In 2022, for instance, some analysts debated whether the energy sector's strength constituted its own bull market even as the broader index declined. Sector-level dynamics can differ materially from the index-level picture.

International bull markets do not always coincide with U.S. ones. A U.S. bull market driven by technology and domestic consumption may not be accompanied by equal gains in emerging markets, Europe, or Japan. International diversification means exposure to different cycle timing and different sector compositions than the U.S. index.

Policy environment matters. Bull markets that occur in the context of falling interest rates (such as the 2009-2020 cycle) may benefit from a structural tailwind that amplifies returns beyond what earnings growth alone would justify. Bull markets occurring during periods of rising rates face a corresponding structural headwind, which can limit the extent of multiple expansion.

Frequently Asked Questions