Volume at least 3x the 20-bar average — extreme activity spike.
The 20-bar average volume on the 1-Hour chart represents approximately 100 minutes of baseline activity. A current bar with 3x this average means more than three times the normal amount of stock changed hands in 5 minutes. This is a raw volume screen with no price direction or indicator requirement -- it detects the anomaly, not the context. The 3x threshold is high enough to filter out routine above-average bars and target only truly exceptional volume events. On liquid large-cap stocks, 3x average 5-minute volume typically indicates a major catalyst: earnings surprise, block trade, macro announcement, analyst action, or options-driven hedging.
A volume shock event requires immediate context assessment before trading -- it is a trigger to investigate, not a trade signal by itself. Direction (is price rising or falling?), news, and broader market conditions all determine the trade thesis. On the bullish side, a 3x volume spike with rising price signals institutional accumulation or a short squeeze. On the bearish side, the same volume with falling price signals aggressive distribution. The main failure mode is the fakeout spike: a single large institutional order creates a brief 3x volume bar, activity normalizes, and price reverts. Traders who act on the spike alone without waiting for follow-through on the next 1-2 bars experience the worst of this. Compare to Volume Surge 2x for the lower-threshold version. Distribution Breakdown is the directional-bearish price version of this concept.
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This screener identifies stocks on the 1-Hour timeframe where volume is at least 3x the 20-bar average -- an extreme activity spike indicating a major event is occurring. Currently 3 stocks match. Event-driven traders, news traders, and intraday momentum traders use this to flag stocks with abnormal institutional or retail activity. Who uses this: traders who react to anomalous volume before the reason is confirmed, knowing that 3x volume almost never occurs without a significant catalyst. Search phrases: extreme volume spike screener 5 minute, 3x average volume stocks, volume shock intraday stocks today. Related: Volume Surge 2x, Distribution Breakdown.