After uncovering its first case of improper trading, Singapore is on guard and asking companies in its $10 billion mutual fund industry to ensure that the one instance was isolated, Reuters reports.

Last week, Alliance Capital Management’s Singapore office was fined for altering buy and sell forms after transactions were made. Specifically, the fine centered around three employees, all of whom have since left the company. The Monetary Authority of Singapore (MAS), which regulates the country’s fund industry, issued a statement about Alliance’s transgressions on Friday.

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