Key legal question
Whether the request for international administrative assistance in the securities matter met the proportionality requirement.
Extracted holding
Yes. The observed volume surge and unusual price rise, together with rapid purchase and resale through a Swiss bank during the sensitive period, justified the request for clarification.
Extracted reasoning
The foreign authority already had sufficient indications of possible market distortion and was not required to prove insider trading before seeking assistance; it could ask for transaction details and assess the explanations itself.