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By Ryan Vlastelica

NEW YORK, July 22 (Reuters) – Shares of USEC Inc, a

uranium company that closed out last week with a market value of

just $30 million, more than doubled on Monday in action that

traders said was due to a combination of thin liquidity and

short-covering.

The stock soared as high as $15.77, up more than 160

percent, its highest level since late January, before paring

gains. It closed up 98 percent to $11.98, the highest close

since March 12.

USEC, a supplier of enriched uranium for commercial nuclear

power plants, said in a statement that it had been contacted by

the New York Stock Exchange about the “unusual market activity”

in its shares, but said its policy is not to comment.

Monday marked a seventh straight session of gains for

Bethesda, Maryland-based USEC, for a total gain of 288 percent.

While there was no specific news about the company, some

analysts cited the weekend elections in Japan, where a

pro-nuclear party posted a strong showing. Shares of Uranium

Resources Inc, another energy company in the nuclear

space, rose 17 percent on Monday.

The move in USEC’s stock was likely amplified by thin

liquidity in a stock that over the last 50 days has averaged

about 113,000 shares a day. About 3.9 million shares exchanged

hands on Monday, the biggest one-day trade in the stock’s

history.

“Liquidity is very thin in a company of this size, and the

combination of that along with what appears to be a short

squeeze is really moving the price,” said Dennis Dick,

proprietary trader at Bright Trading LLC in Las Vegas.

A short squeeze occurs when a stock gains rapidly, causing

traders who had been betting on the stock to fall to cover bets

in order to prevent further losses. About 15 percent of USEC’s

outstanding shares are currently being shorted, according to

data from Markit.

The bid/ask spread on the stock was large, moving as wide as

80 cents at one point. Very liquid stocks, such as Bank of

America Inc, often have a difference between the bid price and

the ask price of a penny.

The spread “means that if someone wants to make a trade in

the thousands or tens of thousands of shares, that will really

move the price,” Dick said.

Shares of USEC on Friday rose 29 percent, a move that the

company also declined to comment on. Friday’s session prompted

the company to issue a similar statement declining to comment on

unusual trading.

The stock had been under pressure since announcing a

1-for-25 reverse share split on June 27 in order to remain

listed on the New York Stock Exchange. That split cut the

company’s outstanding common shares to about 5 million from

about 124 million.

(Editing by Leslie Adler)