Funny, you mentioned many trades of 1 share and small amounts appear to manipulate the price.
Few months ago, in one of my trading days, I bought and sold 20, 50, 100 quantities of shares. Within half an hour, I had a call from my broker's office, asking me to stop doing that as the ASX would consider it as SP manipulations. If they are correct (which I agree with them), then how come big guys are permitted to do that without being punished.
GBG Price at posting:
43.0¢ Sentiment: ST Buy Disclosure: Held