The phrase "a single trader" is correct and usable in written English.
It can be used when referring to one individual who engages in trading, typically in a business or financial context.
Example: "In the world of finance, a single trader can make significant impacts on market trends with their buying and selling decisions."
Alternatives: "an individual trader" or "one trader".
The world copper market is immense; nonetheless, a single trader, apparently, was able and willing to dominate that market.
It is quite common, Mr. Giazzon said, for a single trader to sit in front of three or four screens.
The Court concluded that the alleged group boycott of even a single trader violated the statute 21 without regard to the reasonableness of the conduct in the circumstances.
Many of us remember the collapse of Barings in 1995, done in by the betting of a single trader, Nick Leeson.
You can't understand the stock market by studying a single trader, or a movie by putting a DVD under a microscope.
This week has brought several twists to the tale of how a single trader, Jérôme Kerviel, whose desk was only authorised to take positions of up to € 125m ($183m), could have lost the bank €4.9 billion.
He told Schwartz he had direct knowledge of a trader--a single trader--whose credit department had held up a trade with Bear Stearns, citing concerns about its health.
Traders suspect that a single dealer may be holding the bulk of LME stocks and trying to drive up prices.
It also said it had uncovered a massive fraud by a single rogue trader that would cost it euro4.9 billion.
At the May 11 Congressional hearing, Gary Gensler, the chairman of the commodities agency, said the sharp decline in market prices coincided with heavy selling by a single futures trader.
A single bearish trader on Chicago's derivatives exchange may have unwittingly triggered a chain of events that caused a so-called "flash crash" on Wall Street last week, in which the Dow Jones Industrial Average plunged by a nerve-jangling 998 points, raising the prospect of stockmarket apocalypse just as voters were going to the polls in Britain.
