bhp, page-22

the definition of control is "the power to govern the financial and operating policies so as to obtain benefits from its activities."

Acquiring more than 50% of the voting rights of another company is presumed to give rise to control.

Where less than 50% of voting rights are held, an entity may still have control if it obtains:

* power to govern the financial and operating policies under an agreement; or
* power to appoint/remove the majority of the board

So without any details, we can only guess as to the amount that this unknown party is looking to purchase and the terms of the deal.