On Wednesday, the agency filed to appeal a federal judge's decision to deny a request for a preliminary injunction that would have prevented the deal from closing.
CNBC reported earlier on Wednesday that FTC could bring the judge's decision to the 9th Circuit appeals court.
The FTC declined to comment on its legal response to the judge's decision.
We're confident the U.S. will remain among the 39 countries where the merger can close," an Activision Blizzard spokesperson wrote in an email.
WATCH: Activision CEO Bobby Kotick: Would be surprised if the FTC wastes taxpayer money on appeal
Persons:
Jacqueline Scott Corley, Corley, Bobby Kotick, CNBC's Julia Boorstin, I'd, Kotick, Brad Smith, haven't, We're
Organizations:
Federal Trade Commission, Microsoft, Activision, U.S, Northern, Northern District of, FTC, CNBC, Wednesday Activision, Activision Blizzard, Markets Authority
Locations:
Northern District, Northern District of California, United Kingdom, U.S