(Reuters) – Activision Blizzard is cooperating in federal investigations into trading transactions by its friends shortly before it disclosed its sale. Microsoft Corp (NASDAQ:) It said this in a Friday securities filing.

It was contacted by the U.S. Securities and Exchange Commission and also received a subpoena form a Department of Justice grand jur, which is the Department of Justice grand jury that made “Call of Duty”, as the amended proxy filing stated.

The requests “appear to relate to their respective investigations into trading by third parties – including persons known to Activision Blizzard’s CEO – in securities prior to the announcement of the proposed transaction,” it said.

In January, Microsoft agreed to buy Activision at $95 per share or $68.7 million in total in one of the largest video-gaming industry deals in history.

The company didn’t name any of the participants or state whether subpoenas to grand juries were directed against employees.

However, the filing didn’t disclose the date it was served with the subpoena and the SEC request.

Barry Diller and David Geffen were media moguls and Alexander von Furstenberg was an investor. Alexander von Furstenberg purchased options to share after von Furstenberg met Bobby Kotick from Activision, days before the company announced the sale.

The company stated that “Activision Blizzard informed these authorities it intends be fully cooper with these investigations.”

Diller stated to Reuters last month, that none had knowledge of a potential acquisition. Diller believed Activision was undervalued.

After shareholders sued, the company filed an amended proxy file that contained information about its cooperation with SEC and DOJ.