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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsA bull market is weakening when deterioration persists across several independent parts of the market—not merely when a headline index has one bad day. Monitor participation (breadth), the price trend, volatility, credit spreads and liquidity on a consistent schedule. A warning becomes more meaningful when multiple measures worsen together, but none can identify a top or predict the timing of a decline on its own.
The practical goal is therefore not to call the exact peak. It is to maintain a dated, transparent record of market conditions so you can distinguish a broad change in market behavior from ordinary rotation or noise.
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What “weakening” means in a bull market
A major index can keep rising while its internal support erodes. Fewer constituents may be making new highs, fewer may remain above their moving averages, or credit and liquidity conditions may become less forgiving. That internal deterioration can precede an index decline, but it can also persist while the advance continues or reverse without a bear market.
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Use “weakening” as a description of changing conditions, not a prediction. Every observation should identify the universe (for example, the constituents of a named index), the measurement period, and the indicator definition. Comparing this record with the same market’s history is more useful than applying a universal cutoff that has not been established.
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1. Check participation: is the advance broad or narrow?
Participation, usually called market breadth, asks how many securities are contributing to an index move. A rising index carried by a shrinking group is less broadly supported than one in which gains are shared by many constituents. Breadth divergence is a reason to investigate, not proof that a decline must follow.
Advance–decline participation
An advance–decline measure compares the number of constituents that rose with the number that fell over a stated session or period. Record both the daily readings and a running line or cumulative measure, and state whether you are using all constituents, a sector subset or another defined universe. A weakening cumulative line while the index makes new highs indicates that fewer stocks are doing the advancing, but the divergence can last for months.
Share above a moving average
Calculate the percentage of members trading above a specified moving average, such as a medium-term or long-term average. The choice of average changes the question: a shorter average reflects near-term participation, while a longer one describes more durable trend support. Keep the same average and universe when comparing weeks; changing definitions midstream can manufacture an apparent improvement or deterioration.
New highs versus new lows
Track the number of constituents reaching a new high and a new low during the same look-back window. A healthy advance generally produces expanding new highs and few new lows, while a falling high count or rising low count signals less uniform strength. The result depends on the exchange, index and look-back period, so include those details in your notes.
| Participation measure | What to record | What deterioration can indicate | What it cannot establish |
|---|---|---|---|
| Advance–decline participation | Universe, session or period, advancing count, declining count and cumulative method | Fewer constituents are contributing to gains | That an index must fall or when a fall would begin |
| Percentage above a moving average | Universe, moving-average length and observation date | Trend support is becoming less widespread | A universal buy/sell threshold; the chosen average changes the signal |
| New highs versus new lows | Exchange or index universe and look-back window | Leadership is narrowing or downside pressure is spreading | Whether a short-lived rotation will become a bear market |
2. Examine the price trend without treating crossovers as commands
Price action shows whether a broad index is still producing a sequence of higher highs and higher lows. Repeated failures to exceed a previous high, followed by breaks of prior lows, describe a change in structure more directly than a single red session. Review a broad benchmark and, if relevant, the sectors or regions that matter to your portfolio rather than relying on one popular index.
Higher highs and higher lows
Mark swing points using a consistent chart interval. A series of higher highs and higher lows remains an uptrend even when pullbacks occur. Weakening appears when rallies fail near a prior high or when a pullback breaks and cannot reclaim a prior higher low. Record the dates and levels so that hindsight does not turn an ordinary fluctuation into a supposed signal.
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Moving-average context
Commonly watched medium- and long-term moving averages can help describe whether prices are above or below their recent trend. A close below an average matters more if it persists, the average flattens or turns down, and other breadth measures deteriorate at the same time. A brief intraday break or a crossover caused by a sharp one-day move is context, not an automatic sell signal. Moving averages also lag by design, so they confirm a change after some movement has already occurred.
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- Which index and price series are you using, and are dividends included?
- Did the latest rally exceed the previous high, or stall below it?
- Did the pullback hold the prior higher low?
- Was a moving-average break sustained on closing prices or reversed quickly?
- Are several broad indexes showing the same structure, or only one?
3. Separate a volatility spike from a new volatility regime
Realized volatility measures how much prices have moved over a past window; implied volatility reflects the level of movement options markets are pricing for the future. A sudden jump can accompany an earnings surprise, policy announcement or other event and then fade. Persistent elevation, with larger daily ranges and repeated volatility surges, suggests a more unsettled regime.
Compare the same volatility measure with its own history and note the window used. Do not present volatility alone as a directional forecast: high volatility can occur during a sharp advance, a decline or a fast rebound. It tells you that uncertainty and price sensitivity have changed, not which way the next move must go.
4. Watch corporate credit spreads, including the riskier edges
A credit spread is the yield difference between a corporate bond and a comparable-maturity Treasury. When spreads widen, credit investors are demanding more compensation for default, downgrade or liquidity risk. Broad investment-grade averages can remain calm while speculative-grade borrowers, leveraged loans or a concentrated sector experience stress, so review both an aggregate measure and the riskier segments when data are available.
Use matching maturities and a consistent index. A one-day widening may reflect trading conditions; a persistent move across several weeks, especially alongside weaker equity breadth and a deteriorating price trend, carries more information. Narrow spreads do not certify that equities are safe, and wide spreads do not guarantee an imminent stock-market decline.
5. Assess liquidity and market depth
Liquidity describes how readily trades can be completed without moving prices substantially. Market depth—the amount of buying and selling interest near the current price—can shrink before headline indexes show obvious damage. In a shallow market, a relatively modest order can produce a larger price move, bid–ask costs can increase and exits can become harder during stress.
Liquidity is a market-functioning measure, not a standalone forecast of equity direction. Distinguish a temporary disruption from a persistent reduction in depth, and note whether the observation concerns a particular venue, asset class or the broader market. A liquid index can coexist with stressed small-cap shares or corporate bonds, so state exactly what you measured.
How to combine the five axes
Keep the indicators separate first, then look for persistence and agreement. Breadth and price trend answer different questions: one asks how widely gains are shared, the other whether the benchmark’s structure is holding. Volatility, credit and liquidity add information about uncertainty, financing risk and trading conditions. None is a complete verdict.
| Axis | Improving or stable observation | Deteriorating observation to monitor | Why the combination matters |
|---|---|---|---|
| Participation | More constituents advance, remain above the chosen average and make new highs | Index rises while participation narrows or new lows increase | Shows whether leadership is broadening or becoming concentrated |
| Price trend | Higher highs and higher lows hold across broad indexes | Repeated failed highs, broken higher lows or sustained average breaks | Confirms whether the benchmark’s structure is changing |
| Volatility | Movement stays near its own recent range | Elevated readings persist rather than fading after one event | Adds evidence that uncertainty is becoming structural |
| Credit | Spreads remain steady relative to their history | Spreads widen, especially in speculative-grade or leveraged segments | Signals rising compensation demanded for risk |
| Liquidity | Depth and execution remain orderly | Depth falls and prices become more sensitive to trades | Explains why otherwise modest orders may cause larger moves |
A practical interpretation is qualitative rather than numerical. One deteriorating axis is a prompt to keep watching. Two independent axes that worsen and persist deserve closer risk review. Deterioration across breadth, trend and at least one market-functioning measure (volatility, credit or liquidity) is a materially stronger warning than any single chart. It still does not establish a top, a guaranteed downturn or a timetable.
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A repeatable monitoring process
The value of this framework comes from consistency. Use the following procedure on a weekly schedule, with a monthly review to reduce the influence of one-off sessions.
- Define the universe. Write down the index, constituents, exchange or bond segment you will measure. Do not switch to a more favorable universe after conditions change.
- Define each indicator. Specify the advance–decline calculation, moving-average lengths, new-high/new-low look-back, volatility measure, credit-spread indexes and liquidity proxy.
- Capture a dated baseline. Save the reading, observation period and data source. A chart without a date or definition is difficult to compare later.
- Compare with the indicator’s own history. Ask whether the latest reading is ordinary, unusual or persistent for that same series. Do not import a threshold from a different market or era without explaining the difference.
- Check persistence. Note whether deterioration lasted one session, several weeks or multiple months. A brief event-driven spike should be labeled separately from a regime change.
- Cross-check independent axes. Look for agreement between participation and price structure, then see whether volatility, credit or liquidity confirm or contradict the picture.
- Record conflicts. If valuations look high but credit spreads remain narrow, or breadth weakens while trend remains intact, preserve both observations instead of forcing a binary call.
- Review your decision rules separately. Use the dashboard to decide whether to investigate exposure, diversification, cash needs or position size according to your own plan. It is not a substitute for individualized financial advice.
How to read common combinations
Weak breadth, intact index trend
This pattern means leadership is concentrated while the benchmark still makes higher highs and holds higher lows. It is an early-warning condition worth tracking, not evidence that the bull market has ended. Check whether the narrowing is confined to one sector or visible across the defined universe.
Weak breadth and broken trend
When participation narrows and a broad index repeatedly fails at highs or breaks a prior higher low, the evidence of internal and price deterioration is stronger. Confirmation still requires time: a single close below support can reverse.
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Rising volatility without credit stress
Markets may be reacting to an event while funding conditions remain orderly. Distinguish an isolated volatility shock from a persistent rise, and avoid inferring direction from volatility alone.
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Credit investors may be identifying stress in borrowers that equity indexes have not reflected. Examine speculative-grade and leveraged-loan segments rather than relying only on a broad average, and watch whether the spread move persists.
Low liquidity with mixed other signals
Thin depth increases the chance that normal orders produce outsized moves. It raises execution risk even when the trend and breadth readings are not yet decisively negative; it does not itself forecast a decline.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What official 2026 assessments do—and do not—show
The Federal Reserve’s July 2026 Monetary Policy Report is a dated snapshot, not a live market reading. It said the prices of S&P 500 firms relative to analysts’ earnings projections remained in the upper range of their historical distribution, while measures of the equity premium were at the lower end of their historical range. It also reported that corporate bond and loan spreads remained low by historical standards, while credit concerns increased for riskier debt and spreads widened for speculative-grade technology bonds and leveraged loans. Equity-market liquidity had deteriorated slightly since the start of 2026 and remained low, with low market depth a notable feature.
The Federal Reserve’s May 2026 Financial Stability Report overview likewise described equity valuations as high and corporate bond spreads as low by longer-run standards. These observations illustrate why indicators can disagree: expensive valuations and thin liquidity can coexist with historically narrow broad credit spreads. Check newer releases before describing any of these conditions as current.
Valuation itself is difficult to interpret as a timing tool. In its 2022 Annual Report, the Board of Governors of the Federal Reserve System stated: “Nonetheless, it is very difficult to judge whether an asset price is overvalued relative to fundamentals.” Treat that sentence as a limitation on certainty, not as a market-timing signal.
Common mistakes that create false alarms
- Using one headline index. A capitalization-weighted index can rise because a small number of very large members rise. Add breadth measures and state the constituent universe.
- Reacting to one session. News can produce temporary volatility, a breadth shock or a liquidity gap. Look for persistence on the same schedule.
- Treating a moving-average crossover as an order. Crossovers lag and can whipsaw in sideways markets. Require context from price structure and participation.
- Calling volatility directional. Volatility measures movement and uncertainty, not whether the next move is up or down.
- Relying only on broad credit averages. Aggregate spreads can conceal stress among speculative-grade borrowers, leveraged loans or a concentrated industry.
- Mixing definitions. Changing the index, look-back window or moving-average length makes before-and-after comparisons unreliable.
- Ignoring liquidity when planning an exit. A market can look calm until shallow depth magnifies an order’s price impact.
- Confusing an elevated valuation with an imminent top. Historical comparisons describe relative pricing, not a calendar date for a reversal.
A compact weekly checklist
- Did participation broaden or narrow in the defined universe?
- What percentage of members is above each chosen moving average?
- How did new highs compare with new lows over the stated window?
- Did broad indexes make a higher high, hold a higher low or break that structure?
- Was volatility a brief spike or a persistent elevation relative to its own history?
- Did corporate spreads widen, and did riskier segments behave differently from broad averages?
- Did market depth or execution conditions deteriorate?
- Which observations agree, which conflict and how long has each condition lasted?
Further reading on chart interpretation
For background on chart construction and indicators, John J. Murphy’s guide to technical analysis is an optional print reference. It can explain tools such as trends, moving averages and breadth, but no technical-analysis book can turn these indicators into a reliable top-calling formula.
Bottom line
Judge a bull market’s health by the persistence and agreement of independent evidence. Narrowing participation is often the earliest clue; price structure shows whether the benchmark is following; volatility, credit spreads and liquidity reveal whether uncertainty, financing risk or trading fragility are rising. Keep definitions and dates explicit, report conflicting signals honestly and resist universal thresholds. This process improves situational awareness without pretending that any indicator can tell you exactly when a bull market will end.
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