Enter a ticker symbol for fails to deliver information:

ACUSPHERE INC -- ACUS
Fails to Deliver

Short Interest | Short Volume | Borrow Data | Fails to Deliver

Date	Price	Fails to Deliver

... naked short selling is economically equivalent to a zero-fee zero-rebate loan to the naked short seller from a participant that involuntarily fails to receive shares...
Naked Short Sales and Fails to Deliver: An Overview of Clearing and Settlement Procedures for Stock Trades in the US

Naked short selling is an important and under-reported phenomenon in the US capital markets. Keep track of the data for all of your stocks here.