Apple's portion of the Nortel patent buyout on June 27th was worth $2.6 billion, says UBS analyst Maynard Um. The information comes from Apple's latest 10-Q filing, which was made public on Tuesday in parallel with its third-quarter results. As the buyout was worth about $4.5 billion in total, the figure makes Apple by far the largest partner of a consortium including companies like Sony, Microsoft and RIM.