IDXX

Dark pool — off-exchange short volume

GEX Back to dark pool

Short ratio (latest)

61.8%

20-day average

55.7%

Off-exchange share (20d)

37%

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

636.27

4.39B

625.11

2.51B

613.95

1.21B

602.79

0.96B

591.62

0.83B

580.46

1.91B

569.30

3.50B

558.14

4.29B

546.97

4.14B

535.81

4.38B

524.65

4.71B

513.48

4.44B

502.32

4.91B

491.16

7.03B

480.00

6.77B

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.