https://www.psychreg.org/executive-narcissism-inhibits-inter...
> Dr Liu offered two theories as to why narcissism stands in the way of knowledge transfer: One, narcissistic unit heads may strongly believe that they have a superior knowledge stock, compared to executives in other units, and understand their unit’s problems better – leading them to believe others’ knowledge is less valuable. The second theory is that these executives may believe that knowledge transfer may diminish their sense of superiority and uniqueness, leading them to decline to receive external knowledge in an attempt to preserve their image.
If you're worried you might have narcissitic tendencies, don't worry too much: a real narcissist would never entertain such a notion.