IRM· Iron Mountain
Dark pool · off-exchange short volume
Short ratio (latest)
50.0%
20-day average
48.1%
Off-exchange share (20d)
33%
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
131.31
0.43B
129.00
0.73B
126.70
1.27B
124.39
1.47B
122.09
1.50B
119.79
0.72B
117.48
1.08B
115.18
1.12B
112.88
1.11B
110.57
1.10B
108.27
1.25B
105.97
1.73B
103.66
1.31B
101.36
1.90B
99.05
2.49B
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.