So whats that 150,000,000-(K)-BUY all about then?

That was more than 10% of the company.

A K trade is a Block trade.

block trade

A term used by the London Stock Exchange to denote that a transaction was reported using the block trade facility, which is:
at least 75 times the Normal Market Size (NMS) for a security with an NMS of 2,000 shares

or

above 50 times the NMS for a security with an NMS of 1,000 shares. i.e. a very large transaction

http://www.finance-glossary.com/terms/block-trade.htm?ginPtrCode=00000&PopupMode=false