WST· West Pharmaceutical Services
Dark pool · off-exchange short volume
Short ratio (latest)
63.9%
20-day average
60.3%
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
394.70
1.31B
387.78
1.55B
380.85
1.44B
373.93
1.66B
367.00
2.39B
360.08
2.91B
353.15
3.55B
346.23
2.67B
339.31
3.10B
332.38
3.45B
325.46
3.75B
318.53
3.66B
311.61
3.09B
304.68
2.62B
297.76
2.96B
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.