CMCSA· Comcast
Dark pool · off-exchange short volume
Short ratio (latest)
25.3%
20-day average
50.8%
Off-exchange share (20d)
35%
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
28.73
12.3B
28.22
10.6B
27.72
9.23B
27.22
10.6B
26.71
7.79B
26.21
4.81B
25.70
5.11B
25.20
10.5B
24.70
8.06B
24.19
4.81B
23.69
4.51B
23.18
1.45B
22.68
1.40B
22.18
1.07B
21.67
0.27B
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.