This industry all but closes the last week of the year, every year. 

I tried finding more articles on Tech industry schedules but this pretty much says it

"Yahoo will make employees take vacation last week of the year"

"a traditionally slow period for most businesses outside the retailing and hospitality industries."

"Taking a little time off during a work week when so many of our partners and advertisers are also closed is the prudent thing for Yahoo to do," Libby Sartain, the company's senior vice president for human resources"