ALGN· Align Technology
Dark pool · off-exchange short volume
Short ratio (latest)
59.1%
20-day average
61.0%
Off-exchange share (20d)
41%
Darkpool density
big day, short ratio above trendbelow trendbubble size = how unusual ($vol z-score)
Last ~6 months. Bubbles mark days of unusually large off-exchange dollar volume (≥1.5σ vs the trailing 60 days). Daily resolution — not print-level data.
Darkpool levels ±15% of spot, since 2018-10-01
171.93
2.33B
168.92
2.05B
165.90
1.87B
162.89
1.52B
159.87
1.33B
156.85
1.14B
153.84
0.50B
150.82
0.45B
147.80
0.72B
144.79
0.79B
141.77
1.01B
138.75
1.16B
135.74
1.45B
132.72
1.30B
129.71
0.85B
Historical off-exchange $ volume at price: each day's volume spread across that day's range, summed over the full FINRA history. Heavy shelves often act as support/resistance magnets. Amber row = spot's bin.
Off-exchange short-volume ratio
short ratio (20d, right) daily off-exchange share (left)
FINRA daily TRF data, last 2 years. A persistently HIGH short ratio is mostly passive market-maker liquidity provision (commonly read as accumulation pressure) — not naively bearish.