The Saad Group dumped 5.2% of the company back into the market. ( or possibly into Intel and Apple's hands and it took couple of days for transfers to all clear. ) They could possibly uncork another 7% if things go badly for them for a long time. Intel and Apple are mostly soaking up the excess.
Since, IMG licenses their IP to other folks for inclusion to their chips(for example: http://www.imgtec.com/News/Release/index.asp?NewsID=370) , they are like ARM. Apple needs IMG and ARM around independent so that can lleverage that IP. As long as multiple folks license it the R&D costs are spread out over multiple sources. If the suck it up and make it internal only then all of the R&D costs are borne internally.
If those other customers are the key to the company being profitable, Apple certainly does not want to scare those customers away. How would you like to report at the next quarterly phone conference that a key investment had gone bankrupt and you had to take a big write-down (loss)?
Furthermore, the key engineers there, working on the next gen IP, might just leave if they thought someone was ready to kill their business.