Insiders sold stock recently, but they haven't been buying. But we take heart from prior transactions. On top of that, insiders own a significant portion of the company. So the recent selling doesn't worry us. In addition to knowing about insider transactions going on, it's beneficial to identify the risks facing Longfor Group Holdings. Case in point: We've spotted 4 warning signs for Longfor Group Holdings you should be aware of, and 1 of them is a bit unpleasant.