Unusual Volume Spike (VA3)
Volume ≥ 2.5× average with positive price ROC — institutional or event-driven buying confirmed. Typical: 10–30 stocks daily.
Logic: vol_ratio_20d ≥ 2.5 ∧ roc_10 ≥ 1 ∧ obv_slope_10d > 0. Optional: obv_20d_high = 1. Sort: vol_ratio_20d DESC.
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