Very tough indeed with all that jumbling, in spite of some easy clues (but by no means all). The grid is pretty amazing even allowing for the luxury of jumbles. There are hardly any non-thematic cells.
I'm having trouble with the final name. I can see a possible four-letter name in the upper half of column 12, but so far I've only found a thematic company with that name, and Wiki doesn't say that the company was founded by a thematic person of that name.