"Greatest one-year rise of any exchange-listed stock in the history of Wall Street."

Specialists are responsible for maintaining orderly markets for exchange-listed stocks, matching buyers and sellers.

Although exchange-listed stocks can be traded OTC on the third market, it is rarely the case.

But that was not true in the so-called third market, comprising brokerage firms that trade exchange-listed stocks off the exchange.

Indeed, some that seemed to work well as buy or sell signals for Nasdaq shares failed utterly when applied to exchange-listed stocks.

In exempting exchange-listed stocks from the new rule, regulators assumed that exchanges would enforce tougher standards than those that apply in the pink sheets.

There are many more exchange-listed stocks that are monitored by only one or two analysts.

Some Trading Halted There also were some dislocations in exchange-listed stocks, but they were modest by last week's tumultuous standards.

At the same time, each exchange will be allowed to choose 10 existing options on exchange-listed stocks for trading on their exchanges.

The firm subsequently agreed that it would pull out of penny stocks and focus in the future on exchange-listed stocks.