BSX· Boston Scientific

Dark pool · off-exchange short volume

as of 2026-11-05

BSX's off-exchange short-volume ratio was 36.6% on 5 Nov 2026, below its 20-day average of 37.9%. Off-exchange trading was 39% of volume over the last 20 sessions. 8 sessions in the last six months had unusually large off-exchange dollar volume, the latest on 4 Nov 2026.

Short ratio (latest)

36.6%

20-day average

37.9%

Off-exchange share (20d)

39%

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

52.23

5.05B

51.32

6.02B

50.40

5.15B

49.49

3.60B

48.57

4.67B

47.65

4.72B

46.74

4.93B

45.82

7.21B

44.90

11.0B

43.99

12.4B

43.07

16.2B

42.15

13.1B

41.24

7.84B

40.32

6.72B

39.41

6.65B

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.