The fact that there have been no Mayne Pharma Group insider transactions recently certainly doesn't bother us. But insiders have shown more of an appetite for the stock, over the last year. Overall we don't see anything to make us think Mayne Pharma Group insiders are doubting the company, and they do own shares. So these insider transactions can help us build a thesis about the stock, but it's also worthwhile knowing the risks facing this company. At Simply Wall St, we found 3 warning signs for Mayne Pharma Group that deserve your attention before buying any shares.