I have the Stock Ticker configured to track SPY. Today SPY was down -15.90 to a price of 411.91, and on the Tidbyt it indicated it was down -4.00%. However, that is not the correct percentage based on that price and change. Doing the math, the percentage should indicate -3.72%. I confirmed with stock tracker websites.
Is there a reason why the percentage is different than the math and stock tracker websites?