ALGN

Dark pool — off-exchange short volume

GEX Back to dark pool

Short ratio (latest)

73.9%

20-day average

45.5%

Off-exchange share (20d)

38%

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

196.01

2.18B

192.57

2.14B

189.13

2.54B

185.70

2.26B

182.26

2.48B

178.82

2.94B

175.38

2.36B

171.94

2.02B

168.50

1.87B

165.06

1.96B

161.62

1.31B

158.18

1.20B

154.75

0.58B

151.31

0.40B

147.87

0.78B

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.