What Does it Mean When a Stock Has No Trading Going On?

Overview

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A stock with no trading going on may be halted -- that is, shares have ceased trading for a period of time. Trading usually stops for no longer than a couple of hours, but in rare cases the ban lasts for days or longer.
Halted Trading

Trading activity in a stock may be halted by a stock exchange when there is impending news expected on a company. The news may be positive or negative, and trading stops so that no investors have an unfair advantage to react to news prematurely.

Types

Stocks are labeled when trading is halted. Companies with a T1 label resume trading once the expected news is formally announced. Trading in stocks with a T2 label remains halted even after news is released to give investors additional time to process the event.
History

As a result of the U.S. stock market crash of 198,7 the Securities and Exchange Commission, a regulatory agency that oversees the U.S. financial markets, implemented program trading curbs. The curbs suspended buying and selling of stocks when the markets exhibited extreme volatility. The SEC eliminated the program trading curbs in November 2007, saying they didn't help control market volatility, according to Reuters.
Misconceptions

A stock may trade at extremely low volume at times, and this may be misconstrued as a company with no trading going on. When there is extremely low buying and selling activity in a stock, that usually means investors have little interest in the company.
Regulatory Delays

The Securities and Exchange Commission may delay trading in a stock for a period of up to 10 days. The regulatory body is permitted to take action if the public or investors are at risk, according to the SEC website. Since a company's share price may suffer after being suspended, the SEC is cautious about suspending trading. Typically the SEC acts if it finds a company has reported erroneous information about its finances.