HCA

Dark pool — off-exchange short volume

GEX Back to dark pool

Short ratio (latest)

51.2%

20-day average

52.5%

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

424.18

1.71B

416.74

1.53B

409.30

1.95B

401.86

3.92B

394.42

2.92B

386.97

3.35B

379.53

4.50B

372.09

4.09B

364.65

3.67B

357.21

3.89B

349.76

3.05B

342.32

3.29B

334.88

4.89B

327.44

5.66B

320.00

7.71B

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.