Share price movement

[Harmonica]

Hi

Could someone please enlighten me on this, because I am really new to trading, I'm I right in thinking that the only thing that makes a share go up or down is the number of people buying or selling a particular stock, because I have just recently bought some partygaming stock and since friday it as go down, why would this happen is it traders getting out with there 30% profits on the ipo price or something else?

Thanks in advance