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Regulators are probing block trading on Wall Street, but what is a block?

The New York Stock Exchange defines a block as at least 10,000 shares or a quantity of stock having a market value of $200,000 or more, whichever is less

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Traders work on the floor of the New York Stock Exchange (NYSE) in New York City (Photo: Reuters)

Reuters
The U.S. Securities and Exchange Commission is investigating whether certain banks may have broken the rules by tipping off hedge funds ahead of large sales of shares, or "block trades," a source familiar with the situation told Reuters on Tuesday.

The scrutiny is part of a years-long investigation into block trading by some of Wall Street's biggest players. Here is a primer on block trading.

What is a Block Trade?

The New York Stock Exchange defines a block as at least 10,000 shares or a quantity of stock having a market value of $200,000 or more, whichever is less.

If a seller such as

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