Leaving the narrow range of the Straits Times Index aside, Catalist-listed Yinda Infocomm experienced a sudden surge that elicited a query from regulators. In two trading sessions, prices rose from 20 cents to a high of 39.5 cents. The stock was trading at 35.5 cents on May 27. Technically, such surges are rarely part of sustained moves, especially by small caps — unless one considers the likes of the three penny stocks which crashed in 2013 and the related ISR Capital which has been renamed.

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