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margin call

A broker's demand on an investor using margin to deposit additional money or securities so that the margin account is brought up to the minimum maintenance margin. Margin calls occur when a you account value depresses to a value calculated by the broker's particular formula.
This is sometimes called a "fed call" or "maintenance call"

This is sometimes called a "fed call" or "maintenance call"

A man purchased 100 shares of a $100 stock on a 50% margin two months ago (meaning he paid $5000 initially, and owes another $5000 to his broker). Since then the stock's value has decreased to $90 a share. Since a 50% margin is the maximum allowable by most brokerages, the man receives a margin call from his broker. The broker tells the investor he needs to put another $1000 into the equity to bring it back up to its minimum maintenance margin of 50%. If the investor are unable to do this in a timely manner, the broker will have the right to sell whatever stocks/equity assets of the investor's his brokerage controls to bring the investor's account up to its minimum required margin (and in most cases without needing to consult the investor himself).

The Company is investigating the matters prompting SGX's queries regarding its trading activities, and will release an announcement in due course to update shareholders.