
Understanding terminology
I own 10 shares of AMD and bought them through ally.com as part of my investing account.
I don't know if this is a quirk of ally or just how all interfaces work, but you can see in this screenshot: https://ibb.co/wZC5Rfhx
It shows a last price (I understand that) with a change, (down 4.1%). How is the percentage calculated? What is the reference point for being down? Additionally, the "Todays G/L" is similar, what is the reference. Is this just showing theoretical loss since some last reference point? What is that reference?