BSX
Dark pool — off-exchange short volume
Short ratio (latest)
18.9%
20-day average
25.0%
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
54.67
2.46B
53.71
5.50B
52.75
5.60B
51.79
4.82B
50.83
4.44B
49.87
2.71B
48.91
2.67B
47.96
3.23B
47.00
2.51B
46.04
3.88B
45.08
4.46B
44.12
7.05B
43.16
10.1B
42.20
11.3B
41.24
7.81B
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.