WST· West Pharmaceutical Services

Dark pool · off-exchange short volume

as of 2026-11-05

WST's off-exchange short-volume ratio was 23.7% on 5 Nov 2026, below its 20-day average of 48.6%. Off-exchange trading was 44% of volume over the last 20 sessions. 13 sessions in the last six months had unusually large off-exchange dollar volume, the latest on 4 Nov 2026.

Short ratio (latest)

23.7%

20-day average

48.6%

Off-exchange share (20d)

44%

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

466.01

0.11B

457.83

0.20B

449.66

0.35B

441.48

0.72B

433.31

0.60B

425.13

0.76B

416.96

1.16B

408.78

1.56B

400.60

1.53B

392.43

2.27B

384.25

1.99B

376.08

2.51B

367.90

3.66B

359.73

3.79B

351.55

4.13B

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.