Yes, have several 3D printing and biotech stocks. All small start ups with relativly low volume. They all move iratically not based on news. People blame manipulation, market makers, shorts, etc. Dont know what really is the cause of the movement. However, Arcam has much stonger numbers and fundamentals and it is curious to me as to why it keeps declining against a relativly strong story.
In the end, the only thing that really matters concerning pps is revenue momentum. If earnings are increasing and the story continues to get better no amount of manipulation, shorting, etc. can ultimately reverse the pps. So, as long a the story continues to look promising we have time on our side. Until something changes fundamentally in the stock I will remain long.