Video game giant Activision Blizzard (ATVI) yesterday released its Q4 and FY financial results after the market closed on Monday.

Activision Blizzard reported Q4 GAAP net income of $2.33 billion, compared to $2.16 billion a year earlier. Net bookings for Q4 were $3.57 billion, up 43% YoY and a new quarterly record for the company. Those bookings beat consensus estimates of $3.16 billion.

Mobile bookings grew in the "teens" year-over-year in Q4. Net in-game bookings for Q4 jumped to $1.82 billion, up 46% YoY. Activision Blizzard ended Q4 with 389 million MAU (monthly active users).

For the full year, Activision Blizzard's GAAP net sales rose to $7.53 billion. The company's FY net bookings were $8.51 billion.

However, Activision’s stock fell almost 5% instantly, and the sole biggest reason was that Microsoft's legal team (MSFT) was expecting that, according to a New York Times report on Saturday, the UK's antitrust authority may oppose its $69 billion videogame megadeal.

The NYT updated its story later on Monday, February 6, to include that Microsoft (MSFT) said it believes it has a strong case in the UK and it has not "predetermined," nor been advised by its lawyers that the merger will be blocked. The story develops.