VRTX

Dark pool — off-exchange short volume

GEX Back to dark pool

Short ratio (latest)

51.4%

20-day average

42.2%

Off-exchange share (20d)

36%

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

497.05

4.99B

488.33

8.68B

479.61

11.4B

470.89

13.6B

462.17

12.0B

453.45

9.65B

444.73

11.9B

436.01

11.4B

427.29

10.9B

418.57

7.70B

409.85

7.03B

401.13

7.21B

392.41

7.64B

383.69

4.84B

374.97

3.62B

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.