NVI — Negative Volume Index
Overview
The Negative Volume Index tracks price changes exclusively on days when volume decreases, based on the theory that smart money operates during quieter trading sessions. NVI is a long-term tool primarily used in stock markets to detect institutional accumulation. Pair it with the PVI for a complete picture and browse our indicator guide library for additional volume analysis tools.
How It Works
When today's volume is less than yesterday's: NVI = previous NVI + (percentage price change × previous NVI). When volume increases, NVI stays unchanged. A 255-day EMA is typically overlaid as a signal line. NVI rising on falling volume suggests informed buyers are quietly accumulating.
Key Signals
- NVI above its 255-day EMA = long-term bullish market regime (historically 96% rally probability).
- NVI below its 255-day EMA = long-term bearish or uncertain regime.
- Rising NVI on falling volume = quiet accumulation by informed participants.
Common Mistakes
- Using NVI for short-term trading — it's designed for long-term trend assessment.
- Applying NVI to crypto markets where volume data may be inflated or unreliable.
- Ignoring the PVI counterpart — NVI and PVI work best as a pair.
More Volume Indicators
PVT — Price Volume Trend
Price Volume Trend is similar to <a href="/academy/indicators/on-balance-volume" class="text-primary hover:underline">OBV</a> but adjusts each period's volume by the percentage change in price, giving proportionally more weight to large moves and less to small ones. PVT provides a more nuanced view of accumulation and distribution in <a href="/market/stocks" class="text-primary hover:underline">stocks</a> and <a href="/market/crypto" class="text-primary hover:underline">crypto</a>. Pair PVT with trend-following <a href="/strategies" class="text-primary hover:underline">strategies</a> and explore our <a href="/academy/indicators" class="text-primary hover:underline">indicator guide library</a> for complementary tools.
Accumulation/Distribution Line
The Accumulation/Distribution (A/D) line uses both price and volume to assess whether a security is being accumulated (bought) or distributed (sold) — a refinement on <a href="/academy/indicators/on-balance-volume" class="text-primary hover:underline">OBV</a> that considers where price closes within the bar. A/D divergence is a powerful early signal for <a href="/market/stocks" class="text-primary hover:underline">stock</a> and <a href="/market/crypto" class="text-primary hover:underline">crypto</a> traders who want to spot institutional moves before the crowd. Integrate A/D analysis into your <a href="/strategies" class="text-primary hover:underline">trading strategies</a> alongside price structure for higher-confidence entries. Explore more volume tools in our complete <a href="/academy/indicators" class="text-primary hover:underline">indicator guide library</a>.
Klinger Oscillator
The Klinger Volume Oscillator compares volume flowing in and out of a security using an EMA-based approach, aiming to predict price reversals by detecting divergences between volume trends and price. It is a powerful tool for <a href="/market/stocks" class="text-primary hover:underline">stock</a> and <a href="/market/forex" class="text-primary hover:underline">forex</a> traders who prioritise volume analysis. Add the Klinger Oscillator to your <a href="/strategies" class="text-primary hover:underline">trading strategies</a> and explore our <a href="/academy/indicators" class="text-primary hover:underline">indicator guide library</a> for complementary volume tools.
EMV — Ease of Movement
Ease of Movement relates price change to volume, showing how easily price is moving — large price change on low volume produces high EMV readings, while small moves on heavy volume produce low readings. It is a unique perspective on market efficiency useful in <a href="/market/stocks" class="text-primary hover:underline">stocks</a> and <a href="/market/forex" class="text-primary hover:underline">forex</a>. Add EMV to your <a href="/strategies" class="text-primary hover:underline">trading strategies</a> alongside other volume tools from our <a href="/academy/indicators" class="text-primary hover:underline">indicator guide library</a>.