Who bought 10% of 4DS today???

Never seen 10% of a stock traded in one day - no tremors or warnings other than the usual updates which, as normal, are guarded (not marketing speak)
I'll be surprised if we don''t a substantial holding advice in the next couple of days - if the volume keeps going tomorrow then somebody (a big somebody) knows something we minnows don't. I'm pondering WD making a strategic move based on the knowledge of recent wafer results and input to the next batch which are due soon AND the shakeout that is happening in the industry. It's not a big investment at this stage for them.
Chartists would be loving this.