"Naked short selling is when an investor essentially shorts a stock that he hasn’t actually borrowed." ☛ WSJ

Naked short selling is when an investor essentially shorts a stock that he hasn’t actually borrowed. During the worst of the financial crisis some corporate executives blamed the tactic for their companies’ plunging stock prices. In the U.S., regulators put new temporary rules in place to curb the practice in the fall of 2008. That rule was made permanent in July 2009.