RE:RE:RE:RE:RE:TonyDj7% return on about 20% of your investment so net return is like 1.4% = 20% x 7%, because you are only getting like 20% of your total shares bought back.
The risk is if share price falls by more than 1.75% = 1.4% / 80% on the remaining 80% of the shares not being bought back then you are at loss.
So, I wouldn't just buy the shares for the sake of getting the $4 bid tendered. There is high risk exposure unless you are already a long term shareholder of the company. In which case, your money is already with nbz so there is no change in your risk portfolio.