Currently, it is apparently investigating whether investors who knew CEO Bobby Kotick have acted before the announcement of the Deal with Microsoft with shares of the company.
The Securities and Exchange Commission, which enforces the securities regulations, set appropriate requests to Activision Blizzard with simultaneous summons of the Ministry of Justice.

Activision Shareholders INVESTIGATED for Insider Trading (Microsoft Acquisition)
In a Communication, Activision secured the authorities to investigate his full cooperation in the investigation that wants to clarify whether insider trading was operated before the announcement.