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UNUSUAL VOLUME SCANNER • RELATIVE LIQUIDITY

Relative Volume (RVOL) Screener

Detect high-conviction institutional accumulation before the retail crowd catches on. Filter the US equity universe by relative volume multiples ($2\times$, $5\times$, $10\times+$) to identify stocks trading with unusual participation.

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AssetPriceDelta (%)RVOL Multiple ▼Session VolumeSectorAction
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MATHEMATICAL FOUNDATION • PRACTITIONER GUIDE

How Relative Volume (RVOL) Works: Calculation, Formulas & Strategy

Absolute volume alone is deceptive. 10 million shares traded in Apple ($AAPL) represents a quiet, below-average morning. In contrast, 10 million shares traded in a micro-cap stock with a 5-million-share float represents 200% float turnover—an explosive event. Relative Volume solves this by standardizing volume across individual asset characteristics.

1. The Mathematical RVOL Formula

True Relative Volume is calculated by dividing current cumulative volume at the specific time of day by the average volume accumulated at that exact time over a rolling historical baseline (typically 10 to 30 trading sessions):

RVOL(t) = Cumulative Volume(t) ÷ Average Cumulative Volume[t, 20-Day Baseline]

For example, if ticker $XYZ typically trades 150,000 shares between 9:30 AM and 10:15 AM, but today prints 900,000 shares by 10:15 AM, its RVOL is:

900,000 / 150,000 = 6.0x RVOL (Extreme Volume Surge)

2. The Intraday "U-Shaped" Volume Profile

Market liquidity is not uniformly distributed throughout the 6.5 hours of US market open (9:30 AM – 4:00 PM ET). Institutional volume follows a predictable U-shaped curve:

  • Opening Rush (9:30 – 10:30 AM ET): Accounts for 30% to 45% of total daily volume as overnight orders, earnings releases, and morning news catalysts are digested.
  • Midday Chop (11:30 AM – 1:30 PM ET): Volume contracts sharply. Spreads widen, algorithms take over, and false breakouts frequently trap impatient traders.
  • Power Hour (3:00 – 4:00 PM ET): Massive index rebalancing, closing cross auctions, and institutional block routing cause liquidity to surge into the closing bell.

A naive daily volume comparison fails because an opening gap would look "below average" compared to a full 6.5-hour day. Time-of-day profiling ensures accuracy from minute one.

3. The RVOL Trader's Benchmark Matrix

< 1.0x
Sub-Par / Illiquid Chop: Below normal interest. High slippage, fragile order books, and lack of follow-through. Avoid breakout trades.
1.0x – 2.0x
Standard Session Participation: Baseline activity. Acceptable for range-bound mean reversion or established trend continuations.
2.0x – 4.9x
Institutional Confirmation: Significant accumulation or distribution underway. High probability setups when aligned with technical levels.
≥ 5.0x
Explosive Volume Surge / Float Turnover: Major news catalyst, short squeeze, or binary corporate event. Primary hunting ground for momentum day traders.

4. Crucial Warning: High RVOL Without a Catalyst

When a stock prints 5x to 10x RVOL on no news or vague PR fluff, caution is essential. Often, management uses early morning spike liquidity to execute an At-The-Market (ATM) secondary offering or dump shares via Form S-3 shelf registrations.

Before entering an unusual volume runner, always check the company's SEC filings for active dilution facilities:

Explore Stock Dilution & SEC Risk Playbook →Cross-Reference with Catalyst Calendar →