COST Dark Pool — Off-Exchange & Short Volume

Market/Dark Pool/COST

COST· Costco

Dark pool · off-exchange short volume

Open interest GEX Full dossier

Short ratio (latest)

41.7%

20-day average

43.7%

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

1031.44

12.4B

1013.34

22.1B

995.25

36.4B

977.15

50.7B

959.06

44.6B

940.96

51.3B

922.87

44.3B

904.77

34.4B

886.67

28.0B

868.58

22.3B

850.48

13.4B

832.39

10.1B

814.29

5.69B

796.20

5.76B

778.10

3.36B

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.