A firm rebuts an insider-dealing allegation by showing that the staff who made the trading decision were separated by internal information barriers from those holding the price-sensitive information. This defence is based on:
Recognised exceptions and defences include Chinese-wall knowledge attribution, under which information held on one side of an internal barrier is not attributed to decision-makers on the other side. That is distinct from parity of information, the broker-dealer exemption and the underwriting exception.
Internal information barriers point to the Chinese-wall defence, not to parity of information or the broker-dealer exemption.
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