Ann: Daily share buy-back notice - Appendix 3E , page-2

re: Ann: Daily share buy-back notice - Append... like ive mentioned before this buy back is puzzling me with the company purchasing on market you would think it be the intention to increase shareholder value clearly this is not happening at this stage, and it seems as though they are keeping a wall up to preventing it going higher while they purchase, but how does it go when they are purchasing, is there such a way to manipulate a stock in order to purchase at lower levels or am i simple in thinking there are just constant sellers in the market regardless of the buy back.
just curious holder