HCA· HCA Healthcare
Dark pool · off-exchange short volume
Short ratio (latest)
71.8%
20-day average
67.7%
Off-exchange share (20d)
34%
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
486.71
2.41B
478.17
3.38B
469.63
4.82B
461.10
2.07B
452.56
0.76B
444.02
0.98B
435.48
2.48B
426.94
3.87B
418.40
3.45B
409.86
5.16B
401.32
6.20B
392.78
5.36B
384.25
5.74B
375.71
6.92B
367.17
4.98B
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.