$CEI Short Shares Availability This table shows the number of shares of US:CEI available to be shorted at a leading prime brokerage. It is not the total number of shares available to short, nor is it the short interest. It does not include data from other brokers or dark pools. It is a small sample, and it is useful for tracking the rise and fall in demand for shares throughout the day and weeks. It should not be treated as an absolute number of shares that are available to short in the market.