tools-only Market Top Detection Methodology
Overview
This framework integrates three proven approaches to market top detection, each targeting different aspects of institutional behavior that precede significant market declines (10-20% corrections).
The Three Pillars
Pillar 1: O'Neil - Distribution Day Accumulation
Source: William O'Neil, "How to Make Money in Stocks"
Core Concept: Institutional investors (mutual funds, hedge funds, pensions) cannot sell their large positions in a single day. Their selling creates a distinctive pattern: the index declines on higher-than-previous-day volume. When these "distribution days" accumulate, it signals that smart money is systematically exiting.
Distribution Day Definition:
- Index declines >= 0.2% from previous close
- Volume is higher than previous day's volume
- Both conditions must be met simultaneously
Stalling Day Definition:
- Volume increases from previous day
- But price gain is minimal (< 0.1%)
- Indicates institutional selling into strength
- Counted at half weight (0.5 distribution days)
25-Day Window:
- Distribution days expire after 25 trading days
- Only the rolling 25-day count matters
- This prevents old events from distorting current assessment
O'Neil's Warning Thresholds:
- 4-5 distribution days in 25 trading days = "market under pressure"
- 6+ distribution days = "distribution is heavy, protect capital"
- Combined with stalling days for full picture
Pillar 2: Minervini - Leading Stock Deterioration
Source: Mark Minervini, "Trade Like a Stock Market Wizard" / "Think & Trade Like a Champion"
Core Concept: Market tops do not appear suddenly. They develop through a process where leading stocks - the strongest performers of the previous rally - begin breaking down before the major indices. This is because institutional investors sell their biggest winners first to lock in profits.
Key Observation from Monty Article:
"弱気相場の初期段階では、特定の主導株が下降トレンドに抵抗するかのように強く、上昇できるという印象を与えます。" (In the early stages of a bear market, certain leading stocks appear to resist the downtrend, giving the impression they can still rise.)
Detection Method: Using a basket of growth/innovation ETFs as proxy for market leadership:
- ARKK (Innovation), WCLD (Cloud), IGV (Software)
- XBI (Biotech), SOXX/SMH (Semiconductors)
- KWEB (China Tech), TAN (Solar)
Deterioration Signals per ETF:
- Distance from 52-week high (>10% = concerning, >25% = bear territory)
- Price below 50-day moving average
- Price below 200-day moving average
- Formation of lower highs pattern
Amplification Rule: When 60%+ of leading ETFs show deterioration, the signal is amplified by 1.3x. This reflects the systemic nature of leadership breakdown.
Pillar 3: Monty - Defensive Sector Rotation
Source: monty-trader.com "米国株 株式相場の天井の見極め方と下落局面でやるべきこと"
Core Concept: Before a market top, capital flows from offensive/growth sectors into defensive/value sectors. This "rotation" occurs because institutional investors are becoming defensive while maintaining their equity allocation. It's a critical early warning signal.
Defensive Sectors (Safety Seekers):
- XLU (Utilities) - stable cash flows, bond-like
- XLP (Consumer Staples) - recession-resistant demand
- XLV (Healthcare) - non-discretionary spending
- VNQ (Real Estate) - income-focused
Offensive Sectors (Growth/Risk):
- XLK (Technology) - growth-dependent
- XLC (Communication Services) - ad-spend sensitive
- XLY (Consumer Discretionary) - economically sensitive
- QQQ (NASDAQ 100) - tech-heavy growth proxy
Signal: When defensive sectors outperform offensive sectors over a 20-day rolling period, capital is flowing defensively. A relative performance spread of +3% or more is a strong warning signal.
Supplementary Components
Component 4: Market Breadth Divergence
Concept: When the index makes new highs but fewer stocks participate, the rally is narrowing and vulnerable. This "divergence" between index price and market breadth is a classic top signal.
Key Metric: Percentage of S&P 500 stocks above their 200-day moving average.
- Healthy market: >70% of stocks above 200DMA
- Warning zone: 50-70% with index near highs
- Critical: <50% with index at highs
Important Nuance: Breadth divergence is most meaningful when the index is near its 52-week high (within -5%). If the index has already corrected significantly, weak breadth is expected and less informative.
Component 5: Index Technical Condition
Moving Average Structure:
- Healthy: Price > 21 EMA > 50 EMA > 200 SMA
- Deteriorating: Any of these relationships inverting
- Bearish: Price below all major moving averages
Pattern Recognition:
- Failed Rally: Price bounces but fails to exceed recent peak
- Lower Highs: Sequential swing highs declining
- Gap Downs on Volume: Institutional panic selling
Component 6: Sentiment & Speculation
VIX (Fear Index):
- <12: Extreme complacency (warning)
- 12-16: Low volatility (mild warning)
- 16-20: Normal
25: Fear elevated (top less likely, correction may be underway)
Put/Call Ratio:
- <0.60: Extreme call buying (maximum complacency)
- 0.60-0.70: Elevated optimism
- 0.70-0.80: Mildly bullish
0.80: Healthy caution
VIX Term Structure:
- Steep Contango: Market expects calm (complacency signal)
- Backwardation: Hedging demand elevated (fear present)
Follow-Through Day (FTD) Monitor
O'Neil's concept for bottom confirmation, relevant when composite score > 40:
- Rally Attempt Day: First day the index closes up after a decline
- Counting begins: Day 1 of potential new uptrend
- Follow-Through Day: On days 4-7 of rally attempt, a strong gain (1.5%+) on higher volume than previous day
- Significance: "The most powerful uptrends usually begin with a Follow-Through Day on day 4-7"
False FTD Rate: Approximately 25% of FTDs fail. Multiple FTDs increase confidence.
Scoring Philosophy
Why Weighted Composite?
No single indicator perfectly predicts market tops. Each pillar captures a different dimension:
- Distribution Days: Direct measurement of institutional selling
- Leading Stocks: Quality of market leadership
- Defensive Rotation: Institutional positioning shift
- Breadth: Market participation health
- Technicals: Price structure integrity
- Sentiment: Psychological extremes
Weight Rationale
- Distribution Days (25%): Most direct measure of institutional behavior
- Leading Stocks (20%): Minervini's strongest conviction signal
- Defensive Rotation (15%): Monty's key differentiator
- Breadth (15%): Classic confirmation signal
- Technicals (15%): Structural integrity check
- Sentiment (10%): Context and extremes (less reliable alone)
Calibration Principle
The scoring is calibrated so that:
- A "normal" healthy market scores 10-20
- An "early warning" market scores 25-40
- A market in the "initial to middle stage of top formation" scores 40-55
- A clear top formation scores 60-80
- A completed top with breakdown scores 80+