Naked Before Byrne

Newman explains naked short-selling in eye-opening clarity. Selling unborrowed shares means the buyer doesn't get delivery of the shares he bought. "There are now two actual owners of the same shares. The exact same shares now show up long in both accounts," Newman says. "Every 100 shares of a naked short is a duplication of real shares, just as if the shares had been photocopied and distributed."

So how extensive is the naked shorting? According to Larry Thompson, the First Deputy General Counsel at the Depository Trust and Clearing Corporation, a central clearinghouse for trade settlement, about 1.5% of the dollar volume of stocks traded each day fail to deliver. In a Q&A published this March on the DTCC site, "fails to deliver and receive amount to about $6 billion daily ... including both new fails and aged fails."

Overall, 1.5% of volume may not be much of an impact. But judging from the way some stocks spend weeks and months on the threshold list of shares that face persistent delivery failures, the naked shorting is concentrated in illiquid shares known to be hedge fund targets. The bulk are traded over the counter, but some are well known, such as Netflix(NFLX Quote), Netease(NTES Quote), Shanda Interactive(SNDA Quote) and Taser International(TASR Quote).

Perhaps the most telling data came from a simple Freedom of Information Act filed by an individual investor who asked the SEC for aggregate data on failed deliveries on the NYSE and Nasdaq. Before Regulation SHO was passed in September 2004, an average of about 155 million shares a day failed to deliver on the two exchanges, excluding OTC and Pink Sheet stocks, the data showed.

After Regulation SHO was passed, the delivery failures rose, averaging 205 million shares a day in December and rising as high as 259 million on Dec. 22 alone. Since the law went into effect on Jan. 3, the delivery failures have declined, but are still only about 20% below their levels of last summer.