I keep trying to have a nibble at SP3O (I already hold a parcel)...

I keep trying to have a nibble at SP3O (I already hold a parcel) as they get sold down to 12c-14c every week or so.

But somebody is way too nimble for me and probably has more time on his/her hands, every time I place an order I get outbid by half a cent and when I pull my order she gets sold down lower than where I was previously bidding but very small volumes.

It seems like somebody is just plsying around with SP3O in the hope they will trigger the odd panic seller or stop-loss.