Tiongsquare is correct. I'm also getting this problem. It does not display the premarket or post market stock price but only just the % for pre and post market.

Please fix this to have both pre/post market price and also %

See the photo below.

Photo1

Photo2

* updated my device list: iPhone 6 Plus with latest iOS 11.3.1  iPad Air 2 with latest iOS 11.3.1

I also like the old portfolio.

I also have the same problem on iPad with iOS13. Press News -> Market Data then app crashes.