How do I stop my team from hoarding information in silos?

People hoard what they know when knowing feels like the only thing that keeps them safe. If information is currency, it usually means that being the one who holds it is how people earn standing, security, or a sense of being irreplaceable. The silos are not really about the information. They are about fear of what happens when it is shared. So the fix is not a lecture about teamwork. It is changing what gets rewarded. Right now, quietly, the person who guards knowledge is winning. You need to make the person who shares it win instead. When sharing raises someone's standing rather than lowering their value, hoarding stops paying. Start by praising sharing out loud and in public. When someone passes along what they know and it helps another group, name it and thank them where others can see. Make being generous with knowledge the thing that gets you noticed. What you celebrate is what will spread.