VRTX Dark Pool — Off-Exchange & Short Volume

Market/Dark Pool/VRTX

VRTX· Vertex Pharmaceuticals

Dark pool · off-exchange short volume

Open interest GEX Full dossier

Short ratio (latest)

67.7%

20-day average

62.8%

Off-exchange share (20d)

32%

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

556.68

0.72B

546.37

1.53B

536.06

0.70B

525.75

1.67B

515.44

2.04B

505.13

4.69B

494.82

8.81B

484.51

14.5B

474.20

16.7B

463.90

15.6B

453.59

12.0B

443.28

14.7B

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.