Understanding P/E and why it’s different on different sites / apps
In these screenshots imgur.com/a/fWkRLAY you can see data on Barclays from the apple stocks app, and then two investing sites. I am relatively new to all this but am I seeing P/E of
-16.55 (telegraph), 78.55 (apple stocks), 86.96 (MSN money)
Fair enough those sources might not be recommneded or liked, but how can they be so wildly different?
Second question, how can a company have no forward P/E as shown in the last image?